rich idle problem
Dec 26, 2007, 12:12 AM
#1
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rich idle problem
ok my idle problem started when i installed my gt35r, (used to have a 50 trim)
when i start my car it idles normal, but if i bearly tap the gas my afrs will dip into 8.3 and slowly come back up. Also i did a little tuning 2 weeks ago and my afrs during WOT were in the low 11s....and now all of the sudden my afrs are in the 8s at WOT...... i cant seem to figure out what the problem is. i have 680cc injectors but i have had them on the car for a year and the fuel trims were in check up until i installed this.....ive tried messing with my latency tables but it does not effect my rich idle dip.
any help will be appreciated...i cant seem to figure this out. (all i did was add the turbo, everything else stayed the same)
heres a log
http://www.mediafire.com/?7xmgtcjp0zt
when i start my car it idles normal, but if i bearly tap the gas my afrs will dip into 8.3 and slowly come back up. Also i did a little tuning 2 weeks ago and my afrs during WOT were in the low 11s....and now all of the sudden my afrs are in the 8s at WOT...... i cant seem to figure out what the problem is. i have 680cc injectors but i have had them on the car for a year and the fuel trims were in check up until i installed this.....ive tried messing with my latency tables but it does not effect my rich idle dip.
any help will be appreciated...i cant seem to figure this out. (all i did was add the turbo, everything else stayed the same)
heres a log
http://www.mediafire.com/?7xmgtcjp0zt
Dec 26, 2007, 10:33 AM
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yeah thats the first thing that came to mind but during idle wouldnt a boost leak make me run lean, since its letting unmetered air into my motor? and it would have to be a pretty big leak to throw my afrs off that much. but as soon as i get a chance i plan on doing a boost leak test...
Dec 26, 2007, 11:51 AM
#4
Boost leak would run rich at idle as well. However, a leak that would cause the car to richen up by 2 points would need to be one damn big leak.
I've had IC pipes pop off or leak on the dyno many a times and every time the car would go mad rich. However the car would also choke and fuel cut with anything close to WOT.
I've had IC pipes pop off or leak on the dyno many a times and every time the car would go mad rich. However the car would also choke and fuel cut with anything close to WOT.
Dec 26, 2007, 01:02 PM
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Boost leak would run rich at idle as well. However, a leak that would cause the car to richen up by 2 points would need to be one damn big leak.
I've had IC pipes pop off or leak on the dyno many a times and every time the car would go mad rich. However the car would also choke and fuel cut with anything close to WOT.
I've had IC pipes pop off or leak on the dyno many a times and every time the car would go mad rich. However the car would also choke and fuel cut with anything close to WOT.
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Dec 28, 2007, 11:00 PM
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ok i just checked some of my older logs compared to my newer ones and my ipw's were pretty close to the same...but i did notice that in my newer logs my ipw's dip into the 0's and it didnt in any of my other logs.
would a faulty front o2 sensor cause this? im not throwing any codes...
this is really starting to get frustrating, it will go super rich and then just go super lean....
what would cause my low and mid fuel trims to be off? they were fine before i put the new turbo on so im pretty sure its not my scaling...
would a faulty front o2 sensor cause this? im not throwing any codes...
this is really starting to get frustrating, it will go super rich and then just go super lean....
what would cause my low and mid fuel trims to be off? they were fine before i put the new turbo on so im pretty sure its not my scaling...
Dec 31, 2007, 10:56 AM
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im thinking thats what it is, i cant seem to find anyone else having this issue tho with the stock maf.
i think its just spinning alot faster than my old turbo at idle and its throwing off the maf..... i tried rescaling it and it made no difference....
its starting to get annoying, i had to bump my idle up to 1500 because it likes to die on me....
Last edited by Dapper Dan; Dec 31, 2007 at 10:58 AM.
Jan 1, 2008, 12:45 PM
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I would say faulty O2 sensor, mine just did the same thing. Eventually it threw two codes, P0171, and P0131 (i think) One was for bad o2 sensor, and the other saying that it was running lean, when really it just wasn't reading any voltage so the ecu thought it was lean and thus dumps in hella fuel to correct it giving you the rich condition at idle.
Jan 1, 2008, 01:35 PM
#15
Freaked out FPR???? Or a kink/clog in your return line perhaps?Higher fuel pressures at idle AND at WOT would cause a sudden change in AFR's. Just throwing ideas out. Check your meth kit too.
Last edited by Jack_of_Trades; Jan 1, 2008 at 01:37 PM.