Re: [MBZ] No boost in '91 300d/ early results
Don't forget to look at the easy problems 1st - you may have a vacum hose loose - check the one coming out of the vacuum pump. Larry T (67 MGB, 74 911, 78 240D, 91 300D) www.youroil.net for Oil Analysis and Weber Parts Test Results http://members.rennlist.com/oil PORSCHE POSTERS! youroil.net Weber Carb Info http://members.rennlist.com/webercarbs . - Original Message - From: "Tony Wirtel" <[EMAIL PROTECTED]> To: Sent: Tuesday, December 04, 2007 12:48 PM Subject: [MBZ] No boost in '91 300d/ early results >a HA! With a direct connection between the ALDA and intake, and > controlled vacuum applied to the turbo control valve via mity vac in > car, the turbo IS alive and the car pulls much better. Limited test > to two runs of 5 seconds each and 18" vacuum. Won't know how healthy > the car really is until getting things done by the local indy reset to > original configuration. > > Initial thoughts of going the "easy" way- monitoring EGT and limiting > pressure to the ALDA through a regulator- not only brought back the > your PISTONS will MELT post but of everything else der Doktor would > have said, starting with a stern reminder to consider what I THINK I > know vs what the teams of Mercedes engineers who designed the engine > ACTUALLY knew when they did the work! > > Will post when finally fixed. Thank You to all! > > > Tony Wirtel > > ___ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.503 / Virus Database: 269.16.13/1170 - Release Date: > 12/4/2007 10:52 AM > > ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] No boost in '91 300d/ early results
a HA! With a direct connection between the ALDA and intake, and controlled vacuum applied to the turbo control valve via mity vac in car, the turbo IS alive and the car pulls much better. Limited test to two runs of 5 seconds each and 18" vacuum. Won't know how healthy the car really is until getting things done by the local indy reset to original configuration. Initial thoughts of going the "easy" way- monitoring EGT and limiting pressure to the ALDA through a regulator- not only brought back the your PISTONS will MELT post but of everything else der Doktor would have said, starting with a stern reminder to consider what I THINK I know vs what the teams of Mercedes engineers who designed the engine ACTUALLY knew when they did the work! Will post when finally fixed. Thank You to all! Tony Wirtel ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
Or more max power? Use a manifold pressure gauge to see what you're doing, back off the accelerator a bit if it gets over the magic number? Or better yet - an EGT to watch the temps? > You could just > run a vacuum line straight to the turbo, but you would not have any > overboost protection or anything. Very dangerous. > -- OK Don, KD5NRO Norman, OK "There are three kinds of lies: lies, damn lies, and statistics." -Benjamin Disraeli and/or Mark Twain '90 300D, '87 300SDL, '81 240D, '78 450SLC, '97 Ply Grand Voyager ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
Won't work -- the wastegate is OPEN unless the computer applies vac to the servo to close it, so the default is no boost. Signal line to the ALDA isn't the problem, your turbo is bypassed unless the computer pulls the wastegate closed. If you put an mechanically regulated turbo on there it MAY work, I don't know. Peter ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
"Kaleb C. Striplin, work" <[EMAIL PROTECTED]> writes: > No, its not fuel enrichment it adjusts, its the boost. With no > vacuum the turbo defaults to NO boost. You have to have full vacuum > to the turbo to get boost. When everything is not like it should > be, the turbo vents vacuum so you get no boost. No boost equals no > fuel enrichment. You could just run a vacuum line straight to the > turbo, but you would not have any overboost protection or anything. > Very dangerous. Your PISTONS will MELT. -- 1983 300D 1966 230 ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
Yes, its probably worn out. The delay in reverse is the tale tale sign. --- Kaleb C. Striplin Cox Auto Trader 730-Tulsa FSBO Supervisor - Original Message - From: "Tony Wirtel" <[EMAIL PROTECTED]> To: Sent: Monday, December 03, 2007 10:22 AM Subject: Re: [MBZ] No boost in '91 300d > > >> Tony, >> >> Marshall (MHRIP) would have told you to not assume the transmission is >> bad >> until you have the engine performing as designed. The power produced by >> the >> engine will affect the position of the throttle, hence the shifting >> firmness >> and also the shift timing. >> >> Some time in the 90s, it became a no-no to tamper with the EGR on the >> turbo >> diesels as the computer would know, and lock out the boost, or fuel, >> somehow. >> Basically go into non boosted configuration. >> You should pin that down! >> >> Did you change all the fuel filters? Also try driving without the fuel >> filler cap on the tank, in case it is not venting properly. >> >> I have a very nice Garrett from an 87 603 engine, but it is marked TBO >> 359. >> Photos available. $275, no core required. >> >> Regards, >> >> Jim Friesen >> Phoenix AZ >> 79 300SD, 264 K miles >> 98 ML 320, 152 K miles >> > > Jim, > > I've been playing with this car for about a week here and there, and > ya know after being on this and the R/E list for some time now I've > caught myself thinking a bunch of times "don't assume; think it > through- what would Marshall say here with what I have (or DON'T have) > in front of me?" > > Last weekend when I was playing with this the thought came to mind > that Marshall would know what to do here, and I instinctively thought > to post and ask. But since we haven't heard much, I assumed that he > was dealing with something more important with some sense that it > wasn't good. But we have his example of being a teacher, of > methodically assessing and evaluating a problem to a logical > conclusion, at least most of the time. And we will still miss him. > > Anyway, on the transmission: There can be 4-5 seconds delay to get to > reverse, and even then I've sensed a slight slip once. When in drive > I don't get the slamming I think I should with the vacuum > disconnected- shifts are firmer, but probably not as firm as they > should be. Also the info I have is that at 305k miles the > transmission has never been out of the car. > > Tony Wirtel > > ___ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
> > Tony, > > Marshall (MHRIP) would have told you to not assume the transmission is bad > until you have the engine performing as designed. The power produced by the > engine will affect the position of the throttle, hence the shifting firmness > and also the shift timing. > > Some time in the 90s, it became a no-no to tamper with the EGR on the turbo > diesels as the computer would know, and lock out the boost, or fuel, somehow. > Basically go into non boosted configuration. > You should pin that down! > > Did you change all the fuel filters? Also try driving without the fuel > filler cap on the tank, in case it is not venting properly. > > I have a very nice Garrett from an 87 603 engine, but it is marked TBO 359. > Photos available. $275, no core required. > > Regards, > > Jim Friesen > Phoenix AZ > 79 300SD, 264 K miles > 98 ML 320, 152 K miles > Jim, I've been playing with this car for about a week here and there, and ya know after being on this and the R/E list for some time now I've caught myself thinking a bunch of times "don't assume; think it through- what would Marshall say here with what I have (or DON'T have) in front of me?" Last weekend when I was playing with this the thought came to mind that Marshall would know what to do here, and I instinctively thought to post and ask. But since we haven't heard much, I assumed that he was dealing with something more important with some sense that it wasn't good. But we have his example of being a teacher, of methodically assessing and evaluating a problem to a logical conclusion, at least most of the time. And we will still miss him. Anyway, on the transmission: There can be 4-5 seconds delay to get to reverse, and even then I've sensed a slight slip once. When in drive I don't get the slamming I think I should with the vacuum disconnected- shifts are firmer, but probably not as firm as they should be. Also the info I have is that at 305k miles the transmission has never been out of the car. Tony Wirtel ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
Kaleb C. Striplin, work wrote: > BTW I did get your email about the pump, I have not had time to do anything > with parts lately. I will in the next couple of days. Totally understand. You haven't exactly had a normal week! ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
but its not quite that easy though. You have to fabricate some stuff to get the older style turbo to fit. Somebody did it but I cant remember who. --- Kaleb C. Striplin Cox Auto Trader 730-Tulsa FSBO Supervisor - Original Message - From: "John Robbins" <[EMAIL PROTECTED]> To: "Mercedes Discussion List" Sent: Monday, December 03, 2007 10:11 AM Subject: Re: [MBZ] No boost in '91 300d > Tony Wirtel wrote: >> With the looking I didn't see how the electronics would still >> regulate fuel enrichment, unless theres something integrated into the >> pump I can't see or elsewhere that I just don't understand. > > The electronics don't control the fuel enrichment. The ALDA still does > that in its good old fashioned mechanical way. The problem is that the > computer controls the boost... If the computer kills the boost, then > the ALDA won't increase the fuel output, and you have a slug. > > If you replaced the turbo with a non-computer controlled (standard > pressure regulated wastegate) turbo, you could junk all the electronics. > > HTH! > > John > > > > ___ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
No, its not fuel enrichment it adjusts, its the boost. With no vacuum the turbo defaults to NO boost. You have to have full vacuum to the turbo to get boost. When everything is not like it should be, the turbo vents vacuum so you get no boost. No boost equals no fuel enrichment. You could just run a vacuum line straight to the turbo, but you would not have any overboost protection or anything. Very dangerous. --- Kaleb C. Striplin Cox Auto Trader 730-Tulsa FSBO Supervisor - Original Message - From: "Tony Wirtel" <[EMAIL PROTECTED]> To: Sent: Monday, December 03, 2007 10:03 AM Subject: Re: [MBZ] No boost in '91 300d > The only way to get the car running like it >> should is go to thru the 170 some page diagnostic procedure on the CD. >> Have >> fun!! >> >> --- >> Kaleb C. Striplin >> Cox Auto Trader >> 730-Tulsa FSBO Supervisor > > THAT is what I was afraid of! Oh well, better me than the indy who > put that BB there in the first place. > > I'd hoped that with bypassing EVERYTHING- going straight from the > intake manifold to the ALDA, given that the vacuum transducers had > already had vacuum supply cut off- it would work like an > olde-fashioned, purely mechanical system. With the looking I didn't > see how the electronics would still regulate fuel enrichment, unless > theres something integrated into the pump I can't see or elsewhere > that I just don't understand. > > So tonight, a good read of the diagnostics in front of the football > game. Too bad I don't have a fireplace anymore and I'm out of > scotch... > > Tony Wirtel > > ___ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
You are an idiot, 2 different things :) BTW I did get your email about the pump, I have not had time to do anything with parts lately. I will in the next couple of days. --- Kaleb C. Striplin Cox Auto Trader 730-Tulsa FSBO Supervisor - Original Message - From: "John Robbins" <[EMAIL PROTECTED]> To: "Mercedes Discussion List" Sent: Monday, December 03, 2007 10:02 AM Subject: Re: [MBZ] No boost in '91 300d > Kaleb C. Striplin, work wrote: >> Yes, it does, right at the turbo outlet before the crossover pipe > > Yep, I'm an idiot. For some reason I was thinking the resonance flaps > on the OM606... > > > > ___ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
Tony Wirtel wrote: > With the looking I didn't see how the electronics would still > regulate fuel enrichment, unless theres something integrated into the > pump I can't see or elsewhere that I just don't understand. The electronics don't control the fuel enrichment. The ALDA still does that in its good old fashioned mechanical way. The problem is that the computer controls the boost... If the computer kills the boost, then the ALDA won't increase the fuel output, and you have a slug. If you replaced the turbo with a non-computer controlled (standard pressure regulated wastegate) turbo, you could junk all the electronics. HTH! John ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
Kaleb C. Striplin, work wrote: > Yes, it does, right at the turbo outlet before the crossover pipe Yep, I'm an idiot. For some reason I was thinking the resonance flaps on the OM606... ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
The only way to get the car running like it > should is go to thru the 170 some page diagnostic procedure on the CD. Have > fun!! > > --- > Kaleb C. Striplin > Cox Auto Trader > 730-Tulsa FSBO Supervisor THAT is what I was afraid of! Oh well, better me than the indy who put that BB there in the first place. I'd hoped that with bypassing EVERYTHING- going straight from the intake manifold to the ALDA, given that the vacuum transducers had already had vacuum supply cut off- it would work like an olde-fashioned, purely mechanical system. With the looking I didn't see how the electronics would still regulate fuel enrichment, unless theres something integrated into the pump I can't see or elsewhere that I just don't understand. So tonight, a good read of the diagnostics in front of the football game. Too bad I don't have a fireplace anymore and I'm out of scotch... Tony Wirtel ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
Yes, it does, right at the turbo outlet before the crossover pipe --- Kaleb C. Striplin Cox Auto Trader 730-Tulsa FSBO Supervisor - Original Message - From: "John Robbins" <[EMAIL PROTECTED]> To: "Mercedes Discussion List" Sent: Monday, December 03, 2007 9:41 AM Subject: Re: [MBZ] No boost in '91 300d > Peter Frederick wrote: >> Likely you will find a bad transducer or two (turbo and EGR, maybe the >> intake flap one) or a bad servo. >> >> You can only bypass the computer by replacing the turbo with a >> mechanically controlled one, and I'm not sure that will work well as >> the intake flaps still won't work right. > > Aren't the intake flaps on another later model? My '92 300D doesn't > seem to have any. Maybe I'm blind though! > > John > > > ___ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
Peter Frederick wrote: > Likely you will find a bad transducer or two (turbo and EGR, maybe the > intake flap one) or a bad servo. > > You can only bypass the computer by replacing the turbo with a > mechanically controlled one, and I'm not sure that will work well as > the intake flaps still won't work right. Aren't the intake flaps on another later model? My '92 300D doesn't seem to have any. Maybe I'm blind though! John ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
Everything has to be working or the computer will put the car in limp home no boost mode. With the egr etc blocked off, the computer knows this and will shut down the boost. The only way to get the car running like it should is go to thru the 170 some page diagnostic procedure on the CD. Have fun!! --- Kaleb C. Striplin Cox Auto Trader 730-Tulsa FSBO Supervisor - Original Message - From: "Tony Wirtel" <[EMAIL PROTECTED]> To: Sent: Sunday, December 02, 2007 9:40 PM Subject: [MBZ] No boost in '91 300d > I've got the 300d home and found that the transmission needs a rebuild > as expected, but also that I don't have boost. > > What I know: > > - Tracing vacuum diagrams I found that the EGR and recirc flap control > have already been BB'ed at the vacuum source > - Turbo seems to turn freely. Some oil in the intake but nothing big. > - Putting pressure gauge in line between intake and ALDA see about 3 PSI, > max. > - With pressure to ALDA on acceleration (5-10 PSI) there isn't a jump > in power from expected fuel enrichment > - Putting a line direct from intake to ALDA doesn't help (something > that worked on another car) > - Applying pressure to the ALDA shows minimal leakage > - EGR has a plate covering the port > - Turbo overpressure rod moves freely > - Car doe not appear to have a cat/trap in the exhaust system > - OVP is OK > > This car has a LOT more going on than the last car I had a no-boost > problem with. On that, a 300sdl, jumping a failed switchover valve > fixed it. This car has at least 2 more vacuum/pressure control pots, > a mass air flow sensor, and a boost sensor near the battery. I'm not > familiar with any of these, and the service CD's are at best spotty > with coverage. > > My questions: > > - With the added systems is there an electrical element added to the > injection pump that would prevent enrichment when jumpering the intake > to ALDA? > - Does anyone have a used Garrett TB025 turbo if mine proves bad > - Anywhere else I should be looking? > > Thanks! > > Tony Wirtel > > ___ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
Howdy - My '91 300D 2.5T recently had a problem where the turbo did not work properly, if at all. I had replaced the passenger side headlight and when moving things around to change the light I detached a small hose that comes off the vacuum pump and goes into a small rubber hose about 2" long. It comes out of the pump at the 12 o'clock position and just pushes onto the fitting. It may be partially hidden by the upper radiator hose. Along with the Turbo problem, the transmission also shifted much more firmly than before. It had always shifted very smoothly - it was hard to even notice when it shifted unless paying close attention. With that vacuum hose disconnected it shifted with a firm jolt. Once I located it fixing it was only a matter of seconds. Good luck - Larry T (67 MGB, 74 911, 78 240D, 91 300D) www.youroil.net for Oil Analysis and Weber Parts Test Results http://members.rennlist.com/oil PORSCHE POSTERS! youroil.net Weber Carb Info http://members.rennlist.com/webercarbs . - Original Message - From: "Peter Frederick" <[EMAIL PROTECTED]> To: "Mercedes Discussion List" Sent: Sunday, December 02, 2007 11:16 PM Subject: Re: [MBZ] No boost in '91 300d > First, the turbo is electronically controlled on that car, not > mechanically. If the EGR doesn't work correctly, the computer will > dump the turbo. Ditto for the intake resonance flaps, if they don't > move properly, the computer dumps the boost. If the vac lines are > "BBed", there's the main reason you don't have boost. > > Take the BBs out, check all the lines to make sure they hold vac, and > verify that the switchover valves (transducers) for the flaps, the > turbo, and the EGR are OK, and that the servos for the turbo wastegate > actuator and the flaps are OK and working. Verifty that the EGR valve > operates correctly with vacuum, and remove the plate. > > Likely you will find a bad transducer or two (turbo and EGR, maybe the > intake flap one) or a bad servo. > > You can only bypass the computer by replacing the turbo with a > mechanically controlled one, and I'm not sure that will work well as > the intake flaps still won't work right. > > Peter > > > ___ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.503 / Virus Database: 269.16.13/1164 - Release Date: > 12/2/2007 11:30 AM > > ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
In a message dated 12/2/2007 8:41:32 P.M. US Mountain Standard Time, [EMAIL PROTECTED] writes: My questions: - With the added systems is there an electrical element added to the injection pump that would prevent enrichment when jumpering the intake to ALDA? - Does anyone have a used Garrett TB025 turbo if mine proves bad - Anywhere else I should be looking? Thanks! Tony Wirtel Tony, Marshall (MHRIP) would have told you to not assume the transmission is bad until you have the engine performing as designed. The power produced by the engine will affect the position of the throttle, hence the shifting firmness and also the shift timing. Some time in the 90s, it became a no-no to tamper with the EGR on the turbo diesels as the computer would know, and lock out the boost, or fuel, somehow. Basically go into non boosted configuration. You should pin that down! Did you change all the fuel filters? Also try driving without the fuel filler cap on the tank, in case it is not venting properly. I have a very nice Garrett from an 87 603 engine, but it is marked TBO 359. Photos available. $275, no core required. Regards, Jim Friesen Phoenix AZ 79 300SD, 264 K miles 98 ML 320, 152 K miles **Check out AOL's list of 2007's hottest products. (http://money.aol.com/special/hot-products-2007?NCID=aoltop000301) ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] No boost in '91 300d
First, the turbo is electronically controlled on that car, not mechanically. If the EGR doesn't work correctly, the computer will dump the turbo. Ditto for the intake resonance flaps, if they don't move properly, the computer dumps the boost. If the vac lines are "BBed", there's the main reason you don't have boost. Take the BBs out, check all the lines to make sure they hold vac, and verify that the switchover valves (transducers) for the flaps, the turbo, and the EGR are OK, and that the servos for the turbo wastegate actuator and the flaps are OK and working. Verifty that the EGR valve operates correctly with vacuum, and remove the plate. Likely you will find a bad transducer or two (turbo and EGR, maybe the intake flap one) or a bad servo. You can only bypass the computer by replacing the turbo with a mechanically controlled one, and I'm not sure that will work well as the intake flaps still won't work right. Peter ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] No boost in '91 300d
I've got the 300d home and found that the transmission needs a rebuild as expected, but also that I don't have boost. What I know: - Tracing vacuum diagrams I found that the EGR and recirc flap control have already been BB'ed at the vacuum source - Turbo seems to turn freely. Some oil in the intake but nothing big. - Putting pressure gauge in line between intake and ALDA see about 3 PSI, max. - With pressure to ALDA on acceleration (5-10 PSI) there isn't a jump in power from expected fuel enrichment - Putting a line direct from intake to ALDA doesn't help (something that worked on another car) - Applying pressure to the ALDA shows minimal leakage - EGR has a plate covering the port - Turbo overpressure rod moves freely - Car doe not appear to have a cat/trap in the exhaust system - OVP is OK This car has a LOT more going on than the last car I had a no-boost problem with. On that, a 300sdl, jumping a failed switchover valve fixed it. This car has at least 2 more vacuum/pressure control pots, a mass air flow sensor, and a boost sensor near the battery. I'm not familiar with any of these, and the service CD's are at best spotty with coverage. My questions: - With the added systems is there an electrical element added to the injection pump that would prevent enrichment when jumpering the intake to ALDA? - Does anyone have a used Garrett TB025 turbo if mine proves bad - Anywhere else I should be looking? Thanks! Tony Wirtel ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
