ok guys. got a problem. so out of nowhere the car idles and cruses really lean. like around 15.7. just started to happen out of nowhere. the short term fuel trim is going nuts trying to correct. but one thing i noticed right when it started is that my ground wire for my wideband is loose. it still is but idk if that would cause this problem. but it is def running lean. i have a broken injector clip also so i jiggled it around and pushed down on it to make sure it was on and its good to go. any idea what is causeing my problem. also as far as i can tell, WOT fuel has not been effected at all. am i maybe loosing fuel pressure. i didnt want to get on it so i just limped it back home. but tonight was alot cooler than normal and for the second i was on it it did seem like .2 leaner than normal but it was 30 degrees cooler than what the tune was set for. i have seen it go lean in the cold before so.
__________________
Delta 55 Turbo kit, agp catch can, agp solid motor mounts,scangauge and wideband, 3 bar map and tip, Injen Sri, Jmb with hks, stage 1, exhaust depot custom undercar dump, grantelli wires,DW 750's, walbro. rescale by turbo 666
First, go under the hood and pop out the ASD fuse (bright green 20amp fuse, look under the fuse box cover). Wait 30 seconds, put it back in, start it back up and watch your long-term trims after about 3minutes. If they start going way positive again, then you have a mechanical issue going on. Forget your short term trims, they mean nothing in this situation. Sometimes a bunk tune will give you negative long term trims and hugely positive short term trims to compensate once the weather changes. Watching only the short term doesnt tell you much.
If you dont have a returnline, then its probably your pump going bad.
__________________
04 Eblue - AGP powered...D55 FTW
*NE 400 Club*
Last edited by 04blusrt_4 : 11-06-2009 at 01:58 PM.
First, go under the hood and pop out the ASD fuse (bright green 20amp fuse, look under the fuse box cover). Wait 30 seconds, put it back in, start it back up and watch your long-term trims after about 3minutes. If they start going way positive again, then you have a mechanical issue going on. Forget your short term trims, they mean nothing in this situation. Sometimes a bunk tune will give you negative long term trims and hugely positive short term trims to compensate once the weather changes. Watching only the short term doesnt tell you much.
If you dont have a returnline, then its probably your pump going bad.
no i dont have a recent tune. same tune i have always had. just popped up outta nowhere. i dont have a return line. i will try the asd fuse. i didnt think about that one. i undid the fuel pump relay and battery and still nothing. i will try the asd one right now and report back.
lovely enough, everytime i go to watch my long term fuel trims my scangauge just shuts off and reboots.....WTF. it keeps doing it. if i am on any other screen it is fine but if i go to that screen it just shuts off. i have no idea about that one.
ok guys. got a problem. so out of nowhere the car idles and cruses really lean. like around 15.7. just started to happen out of nowhere. the short term fuel trim is going nuts trying to correct. but one thing i noticed right when it started is that my ground wire for my wideband is loose. it still is but idk if that would cause this problem. but it is def running lean. i have a broken injector clip also so i jiggled it around and pushed down on it to make sure it was on and its good to go. any idea what is causeing my problem. also as far as i can tell, WOT fuel has not been effected at all. am i maybe loosing fuel pressure. i didnt want to get on it so i just limped it back home. but tonight was alot cooler than normal and for the second i was on it it did seem like .2 leaner than normal but it was 30 degrees cooler than what the tune was set for. i have seen it go lean in the cold before so.
UUUUUUHM, YOU ANSWERED YOUR OWN QUESTION.
retighten the ground wire and all will be fine.
UUUUUUHM, YOU ANSWERED YOUR OWN QUESTION.
retighten the ground wire and all will be fine.
shit i hope its just that easy. it has been loose for awhile but never has it registered lean because of it. idk. i will slap a new ground on there and see. anyone else got any ideas.
UUUUUUHM, YOU ANSWERED YOUR OWN QUESTION.
retighten the ground wire and all will be fine.
UM A LOOSE GROUND ON A WIDEBAND doesnt make the trims of the computer start changing LOL. Last I checked the wideband is not what the pcm uses to sense the fueling.
What kind of trims were you seeing before? Kind of sounds like your upper 02 sensor might be shitting the bed or your wires are fried.
UM A LOOSE GROUND ON A WIDEBAND doesnt make the trims of the computer start changing LOL. Last I checked the wideband is not what the pcm uses to sense the fueling.
What kind of trims were you seeing before? Kind of sounds like your upper 02 sensor might be shitting the bed or your wires are fried.
well dandy enough i have another o2 sensor in box if i need it. its not throwing any code. trims were both at like 0.0 nigel hit my rescale pretty good. it used to idle at right about 14.6-15.1. my wideband is the one that aeroforce offers. its practically plug and play with there gauge. air fuel on top and anything else i want below if it was a ground that would be great but i doubt it. when the cable usually goes loose it just reads 10.0 till i jiggle it around and then it comes back on perfect. but right now its not so perfect.
you mentioned your short term trims were all over the place, what were they?
well they were everywhere from -3.4 to 9.2. and they consistantly jumped in between there or so. so im not really sure what to think. does anyone know what my scangauge shuts off when it tries to read long term fuel trims.
well they were everywhere from -3.4 to 9.2. and they consistantly jumped in between there or so. so im not really sure what to think. does anyone know what my scangauge shuts off when it tries to read long term fuel trims.
Thats not that bad, i would be curious what youre long term trims were. But either way, you could have fried the guage from the loose connection. Try to unplug it completely (from the OBDII and the analog 5v in the back of the gauge, wait a few minutes) then plug it back in.
FYI - i have had trouble with the wideband read out from Aero, it was very slow reading and off quite a bit. Compared against two other widebands (they both matched) it was off more than .7 it was reading leaner than actual. Plugs confirmed, they were dark brown after a few runs.
But anyways, it sounds more like a gauge issue, the aeroforce is having a shit fit. The short trims were not that bad, common for weather change. My bet is something got fried in there.
Do a datalog on the DSP and look at your trims that way.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
Lean at idle and crusing NEED HELP!!!!!
if it was a ground that would be great but i doubt it. when the cable usually goes loose it just reads 10.0 till i jiggle it around and then it comes back on perfect. but right now its not so perfect.
Linear Mode
