Help with 96 GT - Codes

Darkside · Dec 23, 2008

Had it scanned at Autozone- came up with

P-1151 and it says " ECM could not adjust fuel trim because of a lean or rich condition. probable causes Fuel pressure too high or low. MAF sensor defective or dirty, Vacuum leak, leaking fuel injector or FPR.

P-1131 - lack of bank 1 02 transistions -lean explanation ECM detected bank 1 02 at its lean limit. probable causes : misfire bank 1,vacuum leak, fuel injector bank 1 only.

And then it had 2 more codes for 02 sensors..

Since the car recently blew a head gasket, the man at autozone said that the Cat convertors was probably stopped up and thats whats causing all of this. What do you guys think?

CC'S95GT · Dec 23, 2008

i'm not real familiar with you mod guys, but i just ckd alldatapro for ya and 1151 and 1131 are both lean codes for left and right banks. on my 5.0 when i got those lean codes all i did was clean the maf.and the codes disappeared. i would start with that, and unplug the batt. so the puter can start from scratch. what were all the codes you got?

Darkside · Dec 23, 2008

Dude at Autozone said they were " just o2 sensor codes" and didnt give me the print out on those, but he said these 2 were the " more serious" ones, and gave me print outs.

Darkside · Dec 23, 2008

I'm not too familiar with the Mod motors either..i've owned 5.0s up untill this 96 GT.

CC'S95GT · Dec 23, 2008

when your hg blew which way did it go? ie: coolant in oil, coolant in exhaust, oil in coolant, exhaust in coolant? if you got coolant out the exhaust (white smoke out of the tail pipe) you may have contaminated the o2's.

Darkside · Dec 23, 2008

Out the exhaust. it steamed out of the exhaust somethin fierce lol so its either gotta be the o2's contaminated and or clogged cats..

TheBoss8907 · Dec 23, 2008

You're going to get an 02 sensor code whenever you have fuel codes. *not all the time, but it shouldn't suprise you.

If it recently blew a head gasket, I would check to make sure all the vaccum hoses are connected back, and make sure you don't have any hoses that could stand to be replaced. Just check for a leak, and if you can't find it, spray some carb cleaner.

Make sure ALL the connectors for the injectors are plugged in ALL the way, and make sure the injectors are in the seats ALL the way.

Then, I'd run a fuel pressure gauge, to make sure you're getting the right amount. If you're not then you know where to start looking.

If that fails I'd hook up a noid light, to make sure you're getting power at all the injectors.

I bet its just something that came loose or wasn't plugged in, if its right after you had the head work done I'm sure you had some kind of warranty, hell I'd take it back to the shop/person.

Darkside · Dec 23, 2008

The car had a Vacuum leak before, and my mechanic replaced all the vacuum hoses-lines, etc. so i dunno..

A guy off another forum said this " the o2s being old or dirty from your head gasket blowing would cause all of that. cause when the ecm throws a code it goes into dummy mode it automatically runs rich as crap. just clean your o2s or put new ones in and clear the codes and you will be fine. the glycol in the antifreeze will blow strait through the cats and collect in and on the o2 surface and cause it not to read at all"