Lots of opportunities for leaks on the ubers, as with any s/c with relocated TB. Could be anywhere from TB through ic to face of head. Injector seals failing not too uncommon. If you don't have a smoke machine, plug tailpipe and air filter off, lightly pressurize and find a smoking friend with enough lung power to blow some smoke over every interface in the car (figured "smoking" and "joint" in same sentence would trigger a visit from the DEA).
Bill Cardell TurboDog's Dad www.flyinmiata.com www.fmwestfield.com Sales 1-800-359-6957 Tech 970-464-5600 Before you call, check out http://www.flyinmiata.com/FAQ/ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matt Bennett Sent: Monday, September 15, 2008 8:43 AM To: [email protected] Subject: Help diagnosing an intake leak After what Ray pointed out to me (below), I looked at some old DLL logs and saw that my Idle MAP reading that is now about 70 used to be in the 40 range. So I slapped myself around a bit and started to look for a vacuum leak. I haven't found anything particularly bad. Anyone have any tip or tricks on looking for an intake leak? I tried pressurizing the intake to a few PSI with my compressor and listening for hissing, but it has been really hard to localize- possibly going through an open intake valve?. One thing that I was wondering- how much of the stock 1.8l engine's cycle has all of the intake valves closed? I did find a better place to put the fuel pressure regulator's vacuum hose, but wiggling stuff around hasn't brought me any closer to bringing the vacuum down to a more appropriate value. Regards, Matt '96 with prototype Ubercharger On Sun, September 7, 2008 1:12 pm, Ray Ayala wrote: > The log shows the idle switch signal on even when the map signal show > that either the throttle is open or there's a big intake air leak. > The idle switch signal kills the fuel completely when rpm is above the > idle control range (~1850 rpm). > > > ----- Original Message ----- > From: "Matt Bennett" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Saturday, September 06, 2008 7:39 PM > Subject: Bucking, DLL help > > >> Howdy folks, I'm trying to figure out my latest issue, I seem to >> remember this type of problem being discussed before, but I didn't >> take adequate notes. Right now, the most annoying problem I have is >> that my car has some very abrupt on/off transitions- also the "idle >> oscillation" is pretty bad. You can see both of these >> characteristics in this (really long) >> log: >> >> <http://www.hazmat.com/~mjb/projects/miata/DataLogs/2008-09-06a.bin> >> >> The vitals on this car: >> 1996 with prototype Ubercharger (intercooled, with air temperature >> sensor) >> 550cc Injectors >> Vishnu Dual feed fuel rail >> Link ECU (non OBD- I believe that this is referred to as a 94-95 >> Link) AEM WB02 Stock engine internals Setup for (but not installed) >> NB02 >> >> >> Another thing I'm thinking of- I realize that tuning on the road is >> difficult, dangerous, and often runs afoul of the law- has anyone >> created a script for the most cost effective way to use a dyno? The >> one that I can rent time on is a brake dyno (not a Dynojet). I want >> to tune for 1) emissions and 2) power with drivability- and 1 and 2 >> don't have to be the same map :) >> >> The vast majority of the adjustments appear to be with fuel- is it >> because changing fuel zones is easier and more effective than >> adjusting timing? >> Or is timing just a lot more dangerous to play with. >> >> With the 94-95 link, can I have both WB and NB O2 sensors logged? I >> realize only one will actually be adjusting settings. If I tune for >> one sensor, will I need to change maps when I move between sensors, >> or can I just do it through the Link keypad? >> >> I realize I need to sit down with the tuning manuals from FM- I went >> looking on Flyin' Miata's site and didn't find the Link tuning >> manual- I've got an old copy- what is the latest revision? >> >> Regards, >> >> Matt Bennett >> Austin, TX >> '96 with prototype Ubercharger >> _______________________________________________ >> Miatapower mailing list >> [email protected] >> http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
