For the last year or so my idle has been lumpy AFTER she warms up (150 degrees). The setup is CRX, d16z6 with gt28r for what its worth. I've cleaned out the IACV as I thought that was the culprit but nothing has changed. If I unplug the temp sending plug on the block the idle raises up to 1500 and stays constant with no hesitation which leads me to believe the temp sensor is working(or no???). If I unplug the IACV plug the car wants to die which seems ok cause no air is getting past the throttlebody when the IACV shuts. Right?? Anyhow I was thinking would the fact that the turbo coolant line which goes from the turbo to the FITV then the IACV have anything to do with my prob as the 2 are seeing very hot coolant causing the sensors to tell the ecu to dump fuel?? Just a shot in the dark on that last one. The car also does not throw any codes. Anyhow any help or whatever is greatly appreaciated. Bad 02 sensor maybe???

Thanks for reading.....

Rick

 

What size injectors are you running ?

 

DSM 450's

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.Death &raquo;</TD></TR><TR><TD CLASS="quote">DSM 450's </TD></TR></TABLE>

It sounds like you maybe idling lean. Contact your tuner to have him hookup a wideband to check out if you need some adjustments made.

 

It's not the tune. I did have my tuner check things out and everything look good. Mind you when the car is cold the idle is perfect, it's only after the car is warmed up that it gets lumpy. Please help!

 

it is the tune...

 

Do you have a known good IACV you could test with? Sometimes cleaning them out isn't enough.

It doesn't sound like it's an issue with the tune, unless whatever software you're/your tuner is running has it's IACV calibrations set wrong.

 

So I tried a different IACV and still my idle is lumpy. Like every couple of seconds randomly it wants to lump out. Keep in mind it doesn't surge at all( idle up and down). It can't be the FITV as that controlls the idle when the engine is cold. Also this happens right when my cars temp reaches 150 degs which leads me to believe that this is sensor related. The 02 sensor maybe??It reacts differently at different temps. Anyone else wanna try and help out???? I'm f'n clued...


Please and thank you.

 

injector battery offset could be your key....