SECURITY Posted December 27, 2009 Share Posted December 27, 2009 (edited) when i go to accelerate from either a standing start or between gears the car hesitates, goes lean and kind of sputters a bit then goes back to normal. if i accelerate SLOWLY it doesnt do it, and when i accelerate HARD it doesnt do it, im not sure what it is. i tried checking for leaks in the vac/cooler system with no luck. i took a vid to see if it would help identify the problem. the gauge on the left is the wideband and you can see the pressure/vac/accelerator position on the gauge on the right.. turn up your volume so you can hear what the car is doing. http://www.youtube.com/watch?v=xPHSLI50Kd4 cheers guys Edited December 27, 2009 by SECURITY Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/ Share on other sites More sharing options...
DRD-00F Posted December 27, 2009 Share Posted December 27, 2009 dat video be private... Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006311 Share on other sites More sharing options...
SECURITY Posted December 27, 2009 Author Share Posted December 27, 2009 oops.. fixed it Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006314 Share on other sites More sharing options...
GTR-32U Posted December 27, 2009 Share Posted December 27, 2009 Thats a tough one, Does it only do it under mild load ? Aftermarket ECU in the car ? maybe a tuning glitch...Are you sure its going lean in that split second and not rich ? Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006320 Share on other sites More sharing options...
DRD-00F Posted December 27, 2009 Share Posted December 27, 2009 well unless he has wired the wideband backwards or some crap, it's definately going lean... It is a tough one! Maybe there's a small block in one of the injectors? Or the pump isn't getting enough voltage or something? Other then that... I was thinking a stuck throttle body but that wouldn't lean it out... Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006329 Share on other sites More sharing options...
SECURITY Posted December 27, 2009 Author Share Posted December 27, 2009 sorry, shouldve given a run down on the car its got a vipec ecu, it does it under any load, i tried changing the tune around (the vipec has a 1-100 range) i went from 42 in the cells up to 60 and it didnt change much, im pretty sure its a mechanical issue. Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006336 Share on other sites More sharing options...
GTR-32U Posted December 27, 2009 Share Posted December 27, 2009 (edited) well unless he has wired the wideband backwards or some crap, it's definately going lean...It is a tough one! Maybe there's a small block in one of the injectors? Or the pump isn't getting enough voltage or something? Other then that... I was thinking a stuck throttle body but that wouldn't lean it out... My mistake...I didnt see the AFR ratio thing on the left...Definately sounds like some kind of fuel issue. Highly doubt its ignition ( although I could be wrong )....Has anything been done to the car recently ..like prior to this problem occuring ?...Maybe a vacuum line got knocked loose Edited December 27, 2009 by GTR-32U Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006409 Share on other sites More sharing options...
Adriano Posted December 27, 2009 Share Posted December 27, 2009 Remember that a missfire will show up as lean on the AFR meter Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006566 Share on other sites More sharing options...
JonnoHR31 Posted December 27, 2009 Share Posted December 27, 2009 missfire will usually dance between rich and lean as pockets of air then pockets of fuel pass the sensor checked your fuel pressure? Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006644 Share on other sites More sharing options...
toddlls Posted December 28, 2009 Share Posted December 28, 2009 Timing is too far retarded perhaps Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006727 Share on other sites More sharing options...
OMGGTR Posted December 28, 2009 Share Posted December 28, 2009 mates car had a similar issue ended up being an earthing problem and coil-pack misfire dunno tho hope u find the source! Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006734 Share on other sites More sharing options...
r31 25t Posted December 28, 2009 Share Posted December 28, 2009 Not sure about the vipec ecu but I had a similar problem on my VH41de safari running a link ecu, it turned out to be an acceleration enrichment issue. Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006742 Share on other sites More sharing options...
SECURITY Posted December 28, 2009 Author Share Posted December 28, 2009 Not sure about the vipec ecu but I had a similar problem on my VH41de safari running a link ecu, it turned out to be an acceleration enrichment issue. i think you might be on to something, ill have a play around with the accel enrichment tables and see where it gets me. Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006805 Share on other sites More sharing options...
STATUS Posted December 28, 2009 Share Posted December 28, 2009 when i go to accelerate from either a standing start or between gears the car hesitates, goes lean and kind of sputters a bit then goes back to normal. if i accelerate SLOWLY it doesnt do it, and when i accelerate HARD it doesnt do it, im not sure what it is. i tried checking for leaks in the vac/cooler system with no luck.i took a vid to see if it would help identify the problem. the gauge on the left is the wideband and you can see the pressure/vac/accelerator position on the gauge on the right.. turn up your volume so you can hear what the car is doing. http://www.youtube.com/watch?v=xPHSLI50Kd4 cheers guys accel pump adjustment Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5006843 Share on other sites More sharing options...
SECURITY Posted December 28, 2009 Author Share Posted December 28, 2009 can you elaborate Trent? i cant find that feature on the vipec Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5007208 Share on other sites More sharing options...
JonnoHR31 Posted December 28, 2009 Share Posted December 28, 2009 its under fuel - accel enrichment Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5007213 Share on other sites More sharing options...
SECURITY Posted December 28, 2009 Author Share Posted December 28, 2009 thanks mate.. just making sure he wasnt talking about something different. Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5007252 Share on other sites More sharing options...
paulr33 Posted December 28, 2009 Share Posted December 28, 2009 when did the problem start what changed since then Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5007302 Share on other sites More sharing options...
Guilt-Toy Posted December 28, 2009 Share Posted December 28, 2009 this car has not been tuned yet has it? Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5007613 Share on other sites More sharing options...
SECURITY Posted December 29, 2009 Author Share Posted December 29, 2009 this car has not been tuned yet has it? not properly, i had it on a dyno after the engine was rebuilt by the engine builder but the new injectors and plenum havent been tuned in properly. i got it running pretty well using the auto tune and the m5, but this problem just started randomly though. the accel enrichment didnt work. it didnt change at all. i think its something mechanical rather than the tune. Link to comment https://www.sau.com.au/forums/topic/301603-almost-stalling-on-acceleration/#findComment-5007886 Share on other sites More sharing options...
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