I keep getting this p0102 code and my truck is running like ***. If i try to floor it, it boggs our and bucks etc, etc, etc. what the **** is going on? i did just have some audio work done and the guy spend a bunch of time under the hood etc cleaning up my bad wiring jobs. where should i look? what should i log? HELPPPPPPP!!!!!!!!

 

wow, i'm AMAZED that nobody has responded. can i just delete the maf to see if that fixes it?

 

Check the engine sensor fuse first.

 

hmmm, what will the fuse box cover say? engine sensor fuse?

 

ENG SENS

 

ok, i don't have that fuse, but, i checked every fuse i do have and they are all fine. I logged some stuff on hptuners and i found that my maf is working fine, until i go past like 1/2 throttle. at 70% tps the maf read 60.xx then started jumping up and down. all the way down to 0. this is exactly when the truck started bucking/bogging.

so, i swapped the maf with one out of my buddies avalanche. same **** happened.

i then set the maf freq to 0, maf table to 0, and p0101-03 all to 2 and ses enable to off. (speed density). no more bogging/bucking.

so what could be going on? i read something about maybe a bad ground?????

 

anyone?????

 

Has your MAF table been messed with at all? Does it do it at the same point all of the time (rpm or MAF frequency), or is it random? Might be wiring or a ground. Don't know where to tell you to start looking though - don't know the trucks so well. Start at the sensor and trace the wires looking for any burnt or rubbed, then find out about the ground connections and clean/tighten them.

 

do you suppose i need to just recharge my filter?????????? it's a cone filter and i think the audio dude may have cleaned my engine compartment. maybe he washed all the oil off the filter????? i'm totally guessing here

 

Carefully clean your MAF sensor, oil may have gotten on the filaments.

 

Im going to guess if he washed the engine off he used high pressure and got water somewhere it shouldnt be. It should go away once you take a nice long drive and heat everything up.....if thats the case. Or maybe he actually damaged a sensor wire or ground wire.

 

i don't know. im at a loss. when in sd mode, it runs like a champ. otherwise, it runs great till i give it too much gas. then the maf goes ******* crazy. makes no sense to me.

 

With 12PSI boost your MAP sensor is flatlined (back at about
1 PSI, you went off-road) but the MAF keeps going; the P0102
code is about disagreement between MAP (speed-density airflow)
and MAF results, somebody's wrong and the PCM may -assume-
it's the MAF and then fault back to speed density mode, which
is the one that's really hurting due to clipped range. Does it run
great in SD, full pedal? How do you manage fueling when the
MAP is pegging out (or do you have a 2-bar MAP)?

 

it runs great in SD other than my 1-2 shift is harder for some reason. I still use the stock 1 bar map sensor. My wideband sensor has been malfunctioning lately (light blinks 8 times). I tried doing the heater calibration but it made no difference.

Here's why I'm stupmped. The truck has been running fantastic for the past year or so. Why all of a sudden is this happening? The maf sensor works technically. I just took it out of my buddy's avalanche last week, lol. I was testing it to see if mine was bad. Since there was no change, i kept it and gave him mine. It just seems far to coincidental that this all started AFTER i had all that audio/wiring work done. There must be a blown fuse or bad ground somewhere.

 

Maybe you should try out another MAP sensor? Or at least
put a meter to it and see if you have 4.5V key on, engine off
and some lesser value at idle or other high vacuum.

 

Keep us posted if you find a fix. Odd that it happened right after the work, you're right...

Perhaps once the voltage reaches a certiain point in the MAF wiring it's shorting to something ? Have you looked closely at/tried jumping the wires ? Just a guess... It's clearly not the physical MAF since you swapped it, could be the wiring ?

Rob (Bad30th)

 

it was suggested to me that i could have a vacuum leak. where do i even begin to look? the filter, maf, tb, and tube are all secure. are ther vacuum hoses i need to be looking for?

 

Check the intake O-ring gaskets. Your story sounds exactly like mine and I checked everything with no answers. It turned out to be a crimped O-ring gasket in the intake manifold. My car also ran fine for a year or so and then I would get the bucking under acceleration, almost like hitting the rev limiter but it would happen out of no where.

Good Luck

PS I was getting the same codes, P0101 P0102 and I swapped my MAF with a friends, checked all intake plumbing for leaks, checked grounds etc and nothing helped until I changed the intake gaskets.

 

on my setup, the tb isn't on the intake manifold, it's on the whipple. i haven't touched the intake. maybe my tb gasket is f'd up. hmmm

 

i would start looking at the wires where the audio guy was "cleaning" up, he may have jacked it up somewhere. Also if you are cleaning the maf, I always use electrical connector cleaner. You can get it at most auto parts stores.