head gasket and lim install and now 2 problems

[bluedevil3758]

hey guys i did the head gasket and lim gaskets on my gf's 04 pontiac grandprix 3.8 na, with 120k and now im getting 2 codes, p0171 system to lean bank 1 and p0108 manifold pressure sensor circuit high input,

now it does have an exhaust leak behind the 2nd oxygen sesnor, didnt line up perfectly and didnt have a new gasket, and the engine is jumpy at idle when first started up and sometimes when driving when lightly on the gas...any help would be great, also for some reason the maf sensor wont click in, i pushed it as far as it can go but no click...

[tylerbinski]

check the pins on the MAF plug are not bent.

Could be running in VE mode and using the Bad fuel spark table in the PCM. CEL is not illuminated first start when MAF failure is detected.

[BillBoost37]

Also pull the EGR tube from EGR to LIM manifold if you bent it out of the way or treated it with anything but "please don't break" type of respect.

They are thin and can crack right at the the edge which causes a vacuum leak and commonly a P0171.

[bluedevil3758]

hmmm will do guys, and what is ve mode? now it went into reduced engine mode... ill post what i find

[TheOtherNick]

ve mode is the fueling table to pcm uses when the maf is not working.

[FoSHO99]

hmmm will do guys, and what is ve mode? now it went into reduced engine mode... ill post what i find

VE volumetric efficiency. It uses a table in the pcm ^(bad fuel) to keep the car halfway running until you get the maf hooked up right. After the MAF is plugged in, check for vac leaks.

[bluedevil3758]

the maf isnt bent or anything but still cant get it to click in all the way... cleared the codes and wiggles it and it tripped the cel, but this time giving me, p0101, p0068, so i def have to get the maf in somehow, also what is the black thing that goes into the upper intake between the tb and egr, has an electrical and vaccum attachment...

[BillBoost37]

The uh evap?

[bluedevil3758]

hey sorry for not posting... the evap wasnt in all the way but not causing an issue... still getting a p0068 and p0101 on start up... i can clear them and drive and they dont come back... but the car bucks when on the gas lightly... theres still an exhaust leak under the car after the 2nd 02 sensor... could that be causing any problems? and im leaning towards vaccum leak or dirty or bad maf sensor... i used propane to try to find the vac leak but didnt notice anything... checked injectors all along lim and upper, tb etc... any ideas?

[bluedevil3758]

im also getting a p0108 code while driving now, but its not tripping off the light

[OH4CompG]

Sounds like you missed a vacuum line somewhere.

[bluedevil3758]

idk im trying to think what i couldve missed... if its entire line wouldnt i not be able to drive it?, i got the brake booster, egr, pcv valve, evap, injectors, tb and the rest is surfaces mating together... right?

[bluedevil3758]

alright... i was lookin at the parts diagram for the 3.8l and noticed what looked like 2 o rings for the pcv valve... my friend took the old one out so i never saw the lower one... and imagine that all the problems fixed... thanks for the help guys