starts and then stalls
Thread Starter
TECH Apprentice
Joined: Aug 2009
Posts: 389
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From: NB Canada
starts and then stalls having probleme tunning after 402 ,cam 236-242, patriot 3 heads, long tubes, caths, ported tb, every time i start it stalls then i have to push the pedal to start again and keep it reved until it decides to idle again, my tuner has tried almost every thing, any sugestions.
Possibly bad IAC, my car was doing similar things and put it on a scanner, IAC was failing..plus o2 sensor on rt bank was crapping out, not enough to through a check engine light, swapped both out to new and car is much better now.
Thread Starter
TECH Apprentice
Joined: Aug 2009
Posts: 389
Likes: 0
From: NB Canada
spent another day at tuner and another 7 hour drive to get there,3rd time going no luck, fuel pressure is 64lb , just replaced both 02s before going this time,seems like he tried every thing electronicly, mayby a mechanical probleme, going to replace my ported tb and different idle air control with a spare stock one i have to see if makes a difference, if any body has seen this before please help, my tuner taught it was inj. tuning probleme(racetronix 42lb tri cone nozzle).
Fuel pressure should be set to 58psi. I know i say this alot, but did you tune the VE and MAF tables and if so did you do it with a wideband 02. It is important that you get the fueling correct first and then work on the idle tuning.
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Thread Starter
TECH Apprentice
Joined: Aug 2009
Posts: 389
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From: NB Canada
changed the tb did not change a thing, put back my ported and drilled the hole bigger, seems mutch better, i just have to touch the gas a bit and starts witout flooding, before i drilled i watched on my scanner and seen the iac number pass 200 counts on start up, so i figured it wanted more air, only thing now it wont idle below 800 because the iac is at almost 0 (not that i want it below 800) but tried to bring the idle lower and could not comanded to. is ther any mod i could do to the iac to control more air?
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Joined: May 2010
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Drilling a whole in the tb is for so called tuners that cannot tune the idle.The ecu will tell you exactly what air it needs for the car to idle properly, but you have to know how to use what has been given to you to do so.There are other factors as well. Get your fueling straight first and then work on the idle tuning.
