Wideband lean at idle and under boost! Ive changed everything! Expert Advice needed

[SpoolingSpyder]

Woah I didn't knwo your car was going lean at idle and at WOT! You should go back and double check your safc wiring and everything make sure that's workin right cause it's startin to sound more like a tuning problem cause if you added that much fuel at idle like you say you did and you didn't notcie ANY diffrence than something isn't right with that safc cause your idle should start to fluxuiate and ac like you have cams if you add to much fuel at your idle rpm.

I swapped out SAFC's and that didnt change a thing. I can double check the wiring tho. Might find something there. I just bought an AVCR electronic boost controller so Ill do them both this weekend.

When I add alot of fuel at idle, the car idles alot better, even at +50% fuel. Right now its at +7% which is supposed to be very rich, and it idles ok. Anything less, the car idles like hell and the engine shakes crazy. But the more rich I make it, +30% or +50% the car starts to actually idle smoother. The Wideband reads the fuel for a good 5 seconds then it comes all the way to max lean again. Even at +50%!

I think were getting closer

 

[SpoolingSpyder]

hey, it looks like you have the turbo wing thats only on the coupes. is that it? if so, send me some pics dude, im thinkin bout doing that to my spyder.

Ive been trying for an hour to get some new pics up in my gallery. Ill have em there shorty bud.

 

[SpoolingSpyder]

i was under the impression that afpr adds fuel 1:1 along with boost. If you were at 40 psi base pressure, and 60 under boost than that seems right. If you were at 43 base pressure then under boost you should be at 63... correct? There is your lean condition... Im not sure about the safc thing as thats past my knowledge, but it seems like if you are adding fuel and getting no difference, than something is wrong...

correct me if im wrong anyone... as im no newb, but not a wiseman by any means...

When I begin to go WOT I get about 60 fuel pressure then let off because the wideband goes lean. Didnt make a full RMP run at 20 PSI lean, because, well, its not safe. No matter what boost I run, 5 PSI, 10 PSI, the car will go to rich, then lean even not going WOT. I can keep the boost at 5PSI and the wideband will go to rich (11.3-5), then within 200 rpms no matter what rpm I start at, it will quickly flip to lean(17.9+)

 

[T9S1i]

intake leak pre turbo, post maf????? maybe do you have your two hoses hooked up and your bov tube on correct???

just another thing to check


danny

 

[SpoolingSpyder]

intake leak pre turbo, post maf????? maybe do you have your two hoses hooked up and your bov tube on correct???

just another thing to check


danny

I changed my intake and filter and swapped out the MAF to see if this was the culprit, nadda. And this happend while driving, so nothing was taking off when the car was running right between when it started happening. Just all of a sudden, boosted, watched my wideband go lean. Started replacing shit left and right. Nothing has seemed to be it.

 

[T9S1i]

how close is your wideband to your turbo? If its too close (in o2 housing or in first bend of d/p) your 02 sensor might be dying. I didnt see if you had swapped/checked this yet, but how long have you had your wideband? Maybe its dying...

 

[93turbo16]

Did you change your fuel filter yet?

 

[tstkl]

he changed his fuel filter a while ago.

the harness controls the injectors, so if the harness went bad, it might tell the injectors to inject less than they actually should, so then you would be running lean. its probably an exhaust leak though, didn't know about that whole white spark plugs/race gas thing at the beginning.

 

[Slippi84]

Yeah if you welded the wideband o2 bung to close to the turbo the heat would mess up your readings. I am not sure if you did this cause you said you replaced a lot of stuff but you ever think of checkin the actualy wideband? Another thing how is your gas mileage been since you car has started running lean cause if your gas mileage hasn't changed at all then you make have a fuel leak and your injectors orings or something along those lines may have went because with a leaner a/f you should be getting better gas mileage.

 

[SpoolingSpyder]

how close is your wideband to your turbo? If its too close (in o2 housing or in first bend of d/p) your 02 sensor might be dying. I didnt see if you had swapped/checked this yet, but how long have you had your wideband? Maybe its dying...

I swapped out the o2 sensor on the wideband with my friends, and it went lean at idle just the same. Ive had the actuall Wideband a year. I will change it out this weekend just for shits and giggles with a brand new one. Im crossing my fingers

 

[SpoolingSpyder]

he changed his fuel filter a while ago.

the harness controls the injectors, so if the harness went bad, it might tell the injectors to inject less than they actually should, so then you would be running lean. its probably an exhaust leak though, didn't know about that whole white spark plugs/race gas thing at the beginning.

If my injectors were the culprit at all, it would throw and engine code, which it hasent for afew days. Then I just got one tonight, so ill see what it is in the morning. I will also change my plugs and run on them for a day or so and look at them. I dont notice a serious change at all in milage. But I can be wrong, so ill keep track next fill.

Im curious, could my wiring harness go bad and cause the lean conditions but not when crusing?

 

[Necromancer69]

Leaky injector O-rings don't throw codes. They just leak. I would take off your fuel rail and visually inspect all your injector o-rings. And make sure when you put it back together that you lube them up a bit so they dont rip.

 

[kelvinb]

do you have a logger? whats your fuel trims? any recent change in weather?

 

[ITSME4G63]

did you ever think your fuel pump might be taking a shit?

 

[SpoolingSpyder]

Leaky injector O-rings don't throw codes. They just leak. I would take off your fuel rail and visually inspect all your injector o-rings. And make sure when you put it back together that you lube them up a bit so they dont rip.

Yeah, i checked the rail and replaced the injectors and o-rings with brand new ones. I can honestly say, I think my injectors and rail are fine.

 

[SpoolingSpyder]

do you have a logger? whats your fuel trims? any recent change in weather?

No, I dont have a logger, but with +50% fuel on the SAFC at any weather should never be idleing lean. When i give the car the least bit of gas, it goes RICH FAST(11.3-7) then falls right back down to lean.

 

[SpoolingSpyder]

did you ever think your fuel pump might be taking a shit?

Yeah, this is about the only thing I havent swapped out yet(But I did take it out and replace the o-riing). The reason being, is because im getting enough fuel pressure. If my pump was going, youd think I would not get anything above 45 PSI of fuel pressure when boosting. But that is not the case. I am starting to think my fuel pump is not getting the right voltage. Anyone know how to test this?

 

[Slippi84]

GET A LOGGER SHAME ON YOU !!!!!!

 

[SpoolingSpyder]

GET A LOGGER SHAME ON YOU !!!!!!

Would a DSM link do the trick?

 

[Slippi84]

HELLS YEAH!

 

[SpoolingSpyder]

HELLS YEAH!

Even though I wouldent need a logger fix why im getting a LEAN condition at idle with +50% on the SAFC. Im going to throw in the DSM Link next week if I havent discovered the problem by the end of the weekend. thanks for the tip bro!

 

[Slippi84]

Def go with DSMlINK but throwing more and more parts at the car might not fix our problem but from what you have said all together it's either your safc wiring or something in your fuel delivery leakin. DSMLINK is a good idea cause you can log what's happening and tune more precise than just throwin fuel at the car till it idles better. Good luck with the LINK

 

[kelvinb]

a log would be useful for sure

 

[T9S1i]

did you raise the fuel pressure to stock yet? any changes???

im still trying to think of other things to check...

dsmlink will be very nice, you can throw that safc out the window when you get the link!

 

[95blackGsTurbo]

Get a logger and then get a FPR. It looks like you are still running on the stock pump which is a big no no. And if you aren't and are using a 255 with no FPR that's an even bigger no no. That will usually cause a rich situation though.