My mods are in my sig.

I just ran this code p2178. No cel however.
I have been having random instances of my car running really Rich the last couple days and periodically last week. My fuel trims would jump Around as much as + or -20to25 around that time. About 10 minutes following I would get what I believe was turbo flutter around 10 minutes following this. On 3 different occasions. It would only boost to 4-5psi when flutter was happening. It almost seems as though the bpv isn't shutting all the way as I'm not getting CEL just a code on my interceptor. It's Also not limp mode when this happens. Nor is "engine power reduced" I left the car over night and it was still fluttering for about 5 minutes the next day. Then back to normal for a day or two. My fuel trims and afr are pretty well perfect 90% of the time. No more than +/- 5 and within 14.3-15 afr.
This morning I swapped out my factory airbox to take it into gm just so the service advisor could hear it. It started flutterin on the way but before I got there it stopped so I never bothered. My trims are not very good though. +/- 10 with the factory air box (with k&n drop in) it will surely start again soon.

Any help would be appreciated I did allot of searching but really couldn't come up with usefull answers. A code decode would be appreciated as well as a possible fix. I want to point them in the right direction as you all know they may have no idea and just say "could not duplicate the issue or some bs"

Thanks for the help.

 

thats the code for too lean at idle? if so i had that problem too i could only boost 15psi and we could never figure out the problem, finally my BCM failed and that was it the whole time

 

I know P2187 is a lean bank code, or lean at idle. I just got this too, im changing my plugs out and tmap out as that is blown so we shall see

 

Thanks for the info guys. I gues i will keep posted. See if the dealership can figure it out. I also have been getting one hell of a hum at 60-70kph from the passenger side. It's likely un related but its been there about as long as ive been having issues.
Driveability has gone to hell a couple of times (around the times my AFR went nuts) just really stuttery. IF the mixture was that far off its obvious why.

The Lower charge pipe sensor is one of the issues i found researching... however it was really vague and not in more than one case i found...

 

ya my fuel trims were way off, if i sat at a stop light ide be bouncing between 16-17 then it would set the code and ide only boost 15psi

then ide reset my fuel trims with my dashhawk and it was good for a while

 

what code were you running when it reduced your boost?

 

No P2178 is rich at idle not lean. The OP had not a 2187. I have had the code P2178 twice in 3 years once when I cracked my stock intercooler and just last week when I had a hole in cold side charge pipe. Both times were boost leaks. I would start with a real boost leak check and go from there. There are a cpl other things that can get that code but usaully a leak.

 

Are you sure? Cuz I literally just had it scanned yesterday and it came up Lean at idle. I put the new plugs and sensor in and it idles MUCH better and runs good to from what the butt dyno can tell, ill have to have someone log it I guess.

 

I was going extremely rich when the problems occured... is it possible this code is Rich OR lean?

 

Definition of Diagnostic Trouble Code P2178 Category Powertrain
Definition System Too Rich Off Idle Bank 1

 

Ok well that basically described what was happening.

 

Yep when you only have that code with no others usually a boost leak. A whacked out maf or a bad purge valve can also bring this code up but usually in conjuntion with codes for them also.

 

whats the purge valve. I think i threw a CEL when I filled my gas tank, and they seem related from basic searching

 

the cel u got from filling the gas tank is prolly for the purge valve at the rear of the car. i can put money on it that the op's issue is the gms1 sensors... but thats just me

 

Dude that's like the 10th tmap u blew lol get a catch can see if that fixes anything!

 

think its my 3rd or 4th its up there, I dunno if it is catch can related tho, this one might of been the plugs throwin it out of whack. Next up is WB02 sensor... than maybe catch can

 

Ahh I see nice man!

 

Goes in to gm first thing tomorrow. Hope they can figure out the issue. Possibly the sensors as I've seen this many a time.

Haven't gotten any flutter since i tool my intake off.... I really hope that wasn't causing it.....I had the intake on for like 3 months prior with absolutely no issues and perfect trims/ afr. Then all of a sudden this...

I've still been getting wacky fuel trims just no flutter with the air box back on.

 

I got my car back today. Replaced a wheel bearing on warranty.
They checked the turbo out for several things and found nothing wrong.
They cleared the code (I left it so they would see it and be aware) and said if I start having issue to bring it in again. We shall see....

 

ok not to thread jack, but I filled my car up today, and it did the thing wear it would not start unless I floored it, than had to baby it so it wouldnt stall before I could drive off

 

When you have a boost leak does it always throw a code?

 

I have been having this same thing and issues with idle. Goes in to limp mode and then eventually kicks off CEL with the Lean at bank 1 code. 2187 I think. So far dealer has replaced map sensors, MAF, Plugs and High pressure fuel pump. Still happening. Going back to dealer Monday. I figure I will let them throw parts at it until they figure it out.

 

Check the BPV for tears. Also, unplug the Purge Solenoid and see if it still happens. If all else fails, do a boost leak test!

 

Heaven forbid!!

 

was it 2178 or 2187 code that u had,. and what was the correction after