Re: [Chevelle-list] Miss at WOT ???
Just to let you guys know I finally found the miss at
WOT. I replaced plugs, points, condenser, rotor and cap and still no
success. Then I repalaced the coil and the miss is gone. Put the
original Quadrajet back on, set the timing by ear and now she runs great -- no
miss , no ping.
Thanksfor all your help
tony
- Original Message -
From:
[EMAIL PROTECTED]
To: The Chevelle Mailing List
Sent: Sunday, June 05, 2005 1:19 PM
Subject: RE: [Chevelle-list] Miss at WOT
???
Is this an electronic ignition or a points distributor?Are we
talking about a WOT condition at lower RPMs or at high RPMs?
The points used to "float" at high rpm's.The distributor lobe is
basically hitting the points rubbing block so fast that there is no time to
close and therefore trigger the coil to make a spark. That's why racers went
to dual point distributors and magnetos.
I'm not that familiar with Holley's but it's possible or "over carb" an
engine. Are you sure you have the right size for the engine and not some
racing monster?
Usually timing would be what I checked first, and sometimes they like to
be more advanced than factory specs in order to run at highest performance. If
you haven't tried it yet, advance ituntil it begins to stumble, then
back off a few degrees, (this will usually be where the engine idles the
fastestand smoothest) thentighten it downand take it
for a test drive.
Steve
- Original Message -
From:
Tony
Gavel
To: Chevelle-list@chevelles.net
Sent: 6/5/2005 9:16:10 AM
Subject: [Chevelle-list] Miss at WOT
???
Hi, Wondering if any of you guys could
offer a suggestion on what could be causing a miss(stumble) at WOT.
It's a 350 / 300hp original 70 Turbo Fire with a Holly. It seems like
a miss at WOTand stumbles, bogs down. I played with the timing
without any results. I don't it's the carb because I tried 3 different
ones and the engine reacts the same with each.Any ideas?
Thanks...tony
Re: [Chevelle-list] Miss at WOT ???
Cool, interesting fix. Just curious, was the coil original factory, quality replacement, or aftermarket replacement? Steve - Original Message - From: Tony Gavel To: [EMAIL PROTECTED];The Chevelle Mailing List Sent: 6/10/2005 10:20:54 AM Subject: Re: [Chevelle-list] Miss at WOT ??? Just to let you guys know I finally found the miss at WOT. I replaced plugs, points, condenser, rotor and cap and still no success. Then I repalaced the coil and the miss is gone. Put the original Quadrajet back on, set the timing by ear and now she runs great -- no miss , no ping. Thanksfor all your help tony
Re: [Chevelle-list] Miss at WOT ???
The coil I replaced was the original. I replaced it with an aftermarket coil from Auto Zone. - Original Message - From: [EMAIL PROTECTED] To: The Chevelle Mailing List Sent: Friday, June 10, 2005 10:42 AM Subject: Re: [Chevelle-list] Miss at WOT ??? Cool, interesting fix. Just curious, was the coil original factory, quality replacement, or aftermarket replacement? Steve - Original Message - From: Tony Gavel To: [EMAIL PROTECTED];The Chevelle Mailing List Sent: 6/10/2005 10:20:54 AM Subject: Re: [Chevelle-list] Miss at WOT ??? Just to let you guys know I finally found the miss at WOT. I replaced plugs, points, condenser, rotor and cap and still no success. Then I repalaced the coil and the miss is gone. Put the original Quadrajet back on, set the timing by ear and now she runs great -- no miss , no ping. Thanksfor all your help tony
[Chevelle-list] Miss at WOT ???
Hi, Wondering if any of you guys could offer a suggestion on what could be causing a miss(stumble) at WOT. It's a 350 / 300hp original 70 Turbo Fire with a Holly. It seems like a miss at WOTand stumbles, bogs down. I played with the timing without any results. I don't it's the carb because I tried 3 different ones and the engine reacts the same with each.Any ideas? Thanks...tony
Re: [Chevelle-list] Miss at WOT ???
I had a similar problem on my '71 350 Malibu. I would check the fuel pump pressure and flow, and/or fuel filter restriction. My problem turned out to be a restriction in the fuel line somewhere, which was fixed by a few strong doses of fuel line cleaner. I think there may have been some gunk build up in the fuel tank, or between the fuel tank and the fuel pump. If the problem is at high RPM and WOT, I would check the coil/ignition system. Tom Tomlinson '71 Malibu - Original Message - From: Tony Gavel To: Chevelle-list@chevelles.net Sent: Sunday, June 05, 2005 9:16 AM Subject: [Chevelle-list] Miss at WOT ??? Hi, Wondering if any of you guys could offer a suggestion on what could be causing a miss(stumble) at WOT. It's a 350 / 300hp original 70 Turbo Fire with a Holly. It seems like a miss at WOTand stumbles, bogs down. I played with the timing without any results. I don't it's the carb because I tried 3 different ones and the engine reacts the same with each.Any ideas? Thanks...tony
RE: [Chevelle-list] Miss at WOT ???
Is this an electronic ignition or a points distributor?Are we talking about a WOT condition at lower RPMs or at high RPMs? The points used to "float" at high rpm's.The distributor lobe is basically hitting the points rubbing block so fast that there is no time to close and therefore trigger the coil to make a spark. That's why racers went to dual point distributors and magnetos. I'm not that familiar with Holley's but it's possible or "over carb" an engine. Are you sure you have the right size for the engine and not some racing monster? Usually timing would be what I checked first, and sometimes they like to be more advanced than factory specs in order to run at highest performance. If you haven't tried it yet, advance ituntil it begins to stumble, then back off a few degrees, (this will usually be where the engine idles the fastestand smoothest) thentighten it downand take it for a test drive. Steve - Original Message - From: Tony Gavel To: Chevelle-list@chevelles.net Sent: 6/5/2005 9:16:10 AM Subject: [Chevelle-list] Miss at WOT ??? Hi, Wondering if any of you guys could offer a suggestion on what could be causing a miss(stumble) at WOT. It's a 350 / 300hp original 70 Turbo Fire with a Holly. It seems like a miss at WOTand stumbles, bogs down. I played with the timing without any results. I don't it's the carb because I tried 3 different ones and the engine reacts the same with each.Any ideas? Thanks...tony
Re: [Chevelle-list] Miss at WOT ??? Steve Tom
Steve Tom,
It's a single point distributor. It's the
original. I ordered the car in 1970 and I haven't had any problems until I
started it up this year. It sat all winter in the garage. I rebuilt
the original spread bore750 cfm,tried a Holley Economizer 450 cfm
and a new Holley 650 and I still have the same problem. New plugs and
wires. Distributor cap and rotor are fairly new. If you floor it in
park, it picks up and then misses and sometimes back fires whenI advance
the timing to about 16*. It's worse when I set it to factory specs, 4* but
now backfire. It does the same when you drive it and floor it. I did
put a new fuel pump on and that didn't help. I guess I should change the coil
next.
tony
From: [EMAIL PROTECTED]
To: The Chevelle Mailing List
Sent: Sunday, June 05, 2005 1:19 PM
Subject: RE: [Chevelle-list] Miss at WOT
???
Is this an electronic ignition or a points distributor?Are we
talking about a WOT condition at lower RPMs or at high RPMs?
The points used to "float" at high rpm's.The distributor lobe is
basically hitting the points rubbing block so fast that there is no time to
close and therefore trigger the coil to make a spark. That's why racers went
to dual point distributors and magnetos.
I'm not that familiar with Holley's but it's possible or "over carb" an
engine. Are you sure you have the right size for the engine and not some
racing monster?
Usually timing would be what I checked first, and sometimes they like to
be more advanced than factory specs in order to run at highest performance. If
you haven't tried it yet, advance ituntil it begins to stumble, then
back off a few degrees, (this will usually be where the engine idles the
fastestand smoothest) thentighten it downand take it
for a test drive.
Steve
- Original Message -
From:
Tony
Gavel
To: Chevelle-list@chevelles.net
Sent: 6/5/2005 9:16:10 AM
Subject: [Chevelle-list] Miss at WOT
???
Hi, Wondering if any of you guys could
offer a suggestion on what could be causing a miss(stumble) at WOT.
It's a 350 / 300hp original 70 Turbo Fire with a Holly. It seems like
a miss at WOTand stumbles, bogs down. I played with the timing
without any results. I don't it's the carb because I tried 3 different
ones and the engine reacts the same with each.Any ideas?
Thanks...tony
Re: [Chevelle-list] Miss at WOT ??? Steve Tom
hope the chain didn't jump a tooth ?? - Original Message - From: Tony Gavel To: [EMAIL PROTECTED] ; The Chevelle Mailing List Sent: Sunday, June 05, 2005 8:57 PM Subject: Re: [Chevelle-list] Miss at WOT ??? Steve Tom Steve Tom, It's a single point distributor. It's the original. I ordered the car in 1970 and I haven't had any problems until I started it up this year. It sat all winter in the garage. I rebuilt the original spread bore750 cfm,tried a Holley Economizer 450 cfm and a new Holley 650 and I still have the same problem. New plugs and wires. Distributor cap and rotor are fairly new. If you floor it in park, it picks up and then misses and sometimes back fires whenI advance the timing to about 16*. It's worse when I set it to factory specs, 4* but now backfire. It does the same when you drive it and floor it. I did put a new fuel pump on and that didn't help. I guess I should change the coil next. tony From: [EMAIL PROTECTED] To: The Chevelle Mailing List Sent: Sunday, June 05, 2005 1:19 PM Subject: RE: [Chevelle-list] Miss at WOT ??? Is this an electronic ignition or a points distributor?Are we talking about a WOT condition at lower RPMs or at high RPMs? The points used to "float" at high rpm's.The distributor lobe is basically hitting the points rubbing block so fast that there is no time to close and therefore trigger the coil to make a spark. That's why racers went to dual point distributors and magnetos. I'm not that familiar with Holley's but it's possible or "over carb" an engine. Are you sure you have the right size for the engine and not some racing monster? Usually timing would be what I checked first, and sometimes they like to be more advanced than factory specs in order to run at highest performance. If you haven't tried it yet, advance ituntil it begins to stumble, then back off a few degrees, (this will usually be where the engine idles the fastestand smoothest) thentighten it downand take it for a test drive. Steve - Original Message - From: Tony Gavel To: Chevelle-list@chevelles.net Sent: 6/5/2005 9:16:10 AM Subject: [Chevelle-list] Miss at WOT ??? Hi, Wondering if any of you guys could offer a suggestion on what could be causing a miss(stumble) at WOT. It's a 350 / 300hp original 70 Turbo Fire with a Holly. It seems like a miss at WOTand stumbles, bogs down. I played with the timing without any results. I don't it's the carb because I tried 3 different ones and the engine reacts the same with each.Any ideas? Thanks...tony
Re: [Chevelle-list] Miss at WOT ??? Steve Tom
I went down the same path (new fuel pump, carb, coil, points, etc), but I didn't fix it until I used the fuel line cleaner. I also had stock points at the time. My problem also started after sitting all winter (yes, I use fuel stablizer). Fuel line cleaner ischeap enough to try. I'd also disconnect fuel line after the pump and look at the fuel flow while someone turns the engine over. I think there is a spec on the flow rate you can check to make sure there is no fuel blockage between the tank and the pump. Tom Tomlinson - Original Message - From: Tony Gavel To: [EMAIL PROTECTED] ; The Chevelle Mailing List Sent: Sunday, June 05, 2005 8:57 PM Subject: Re: [Chevelle-list] Miss at WOT ??? Steve Tom Steve Tom, It's a single point distributor. It's the original. I ordered the car in 1970 and I haven't had any problems until I started it up this year. It sat all winter in the garage. I rebuilt the original spread bore750 cfm,tried a Holley Economizer 450 cfm and a new Holley 650 and I still have the same problem. New plugs and wires. Distributor cap and rotor are fairly new. If you floor it in park, it picks up and then misses and sometimes back fires whenI advance the timing to about 16*. It's worse when I set it to factory specs, 4* but now backfire. It does the same when you drive it and floor it. I did put a new fuel pump on and that didn't help. I guess I should change the coil next. tony From: [EMAIL PROTECTED] To: The Chevelle Mailing List Sent: Sunday, June 05, 2005 1:19 PM Subject: RE: [Chevelle-list] Miss at WOT ??? Is this an electronic ignition or a points distributor?Are we talking about a WOT condition at lower RPMs or at high RPMs? The points used to "float" at high rpm's.The distributor lobe is basically hitting the points rubbing block so fast that there is no time to close and therefore trigger the coil to make a spark. That's why racers went to dual point distributors and magnetos. I'm not that familiar with Holley's but it's possible or "over carb" an engine. Are you sure you have the right size for the engine and not some racing monster? Usually timing would be what I checked first, and sometimes they like to be more advanced than factory specs in order to run at highest performance. If you haven't tried it yet, advance ituntil it begins to stumble, then back off a few degrees, (this will usually be where the engine idles the fastestand smoothest) thentighten it downand take it for a test drive. Steve - Original Message - From: Tony Gavel To: Chevelle-list@chevelles.net Sent: 6/5/2005 9:16:10 AM Subject: [Chevelle-list] Miss at WOT ??? Hi, Wondering if any of you guys could offer a suggestion on what could be causing a miss(stumble) at WOT. It's a 350 / 300hp original 70 Turbo Fire with a Holly. It seems like a miss at WOTand stumbles, bogs down. I played with the timing without any results. I don't it's the carb because I tried 3 different ones and the engine reacts the same with each.Any ideas? Thanks...tony
Re: [Chevelle-list] Miss at WOT ??? Steve Tom
Check the distributor shaft for excessive play. Best bet is to put in electronic ignition, more reliable, hotter spark. BobA.C.E.S. #1164T.C. #37565 Malibu85 El Camino00 Monte Carlo
