Schaeffer

iTrader: (2)

My car recently threw the p1101 code which means MAF out of frequency(correct me if im wrong) and since the my afr has been randomly going lean... then the comp. adjusts for the lean issue and the car goes rich.... then back to normal afr's. when i say lean i mean like 16.5 - 17.0 and rich at 10.2- 11.1.


I need to find a solution to this problem asap...

thanks

bigrroberto

Intersted too. Mine throws this everytime once a jump on the highway. Clear it Nd it doesn't come back for awhile. I tried adjusting my maf freq but it didn't fix the problem. It's been doing this for me for almost a year. It doesn't hurt anything, just annoying.

Sunburst_SS

basically, it's an intake air flow performance code....in a nutshell, it's saying the metered air is not matching up between the MAF, MAP, and SCIP sensor. Do a basic check for blockages, manifold vac. leaks, leaks in the intake, poor connections at the connectors/wiring, and go from there.

BTW, how long ago did you have the car tuned?

Schaeffer

iTrader: (2)

alright. its obviously messing something up since it sending my Afr's all over.

Sunburst is there any possibility that my oil/air separator is clogging up somehow??? got the good ol' home depot one

bigrroberto

It shouldn't have anything to do with your afr's

K-Train04RL

iTrader: (1)

lol ive gotten this code since stock, the dealershit wont do nething for me. i would really like to know the fix to this. along w/ this code comes all the lean codes w/ it. now i have exhaust and intake as performance and its obv still doing it. it happens more often in the winter too, which is explainable just annoying.

Sunburst_SS

that something on your intake???

outtamymind

here are the steps from GM's service site that are points to check when this code is set

• A restricted or collapsed air intake duct

• A misaligned or damaged air intake duct

• A dirty or deteriorating air filter element

• Any objects blocking the air inlet probe of the mass air flow (MAF)/intake air temperature (IAT) sensor

• Any contamination or debris on the sensing elements in the probe of the MAF/IAT sensor

• Any water intrusion in the induction system

• Any vacuum leak downstream of the MAF/IAT sensor

• An intake manifold leak

• A supercharger inlet pressure (SCIP) sensor seal that is missing or damaged

• A manifold absolute pressure (MAP) sensor seal that is missing or damaged

• A stuck supercharger bypass valve--Refer to Boost Control System Diagnosis.

• A skewed or stuck engine coolant temperature (ECT) or IAT sensor--Refer to Temperature Versus Resistance.

• Any type of restriction in the exhaust system--Refer to Restricted Exhaust.

also if you have access to HPTuners or a Tech2 check to make sure your barometer is reading correctly as well

K-Train04RL

iTrader: (1)

that is his return line to the intake. he has a air compressor filter on it so no oil gets back up in the intake

Schaeffer

iTrader: (2)

Had no problems what so ever until this code popped up driving home from Cleveland on saturday...... Since then my Afr will random go Lean.. Only in the Lower Rpm Range, which is odd.. Tomorrow im checking all the plugs, air filter, oil/air separator, Maf sensor..

Also i have never gotten the lean code. Which is P0171 i believe.

outtamymind

ya but you could still be running lean and not throw that code. the P0171 is specific to the LTFT's if i'm not mistaken

Schaeffer

iTrader: (2)

Yeah i think p0171 is limited to the Fuel Trim... not 100% sure though.

Sunburst_SS

for the p0171 the LTFT has to be about 18% or greater for 2 minutes continuously.

Anyways, if your MAF is failed I beleive the pcm will provide fueling from the VE tables. So if those weren't tuned when the car was programmed, that could explain the wacky afr as well. Does the DTC set again if you clear it out?

outtamymind

just for ***** and giggles. i noticed you have a CAI installed. have you checked that thoroughly for any leaks whether it be at the connectors or a rub in the tubing?

Schaeffer

iTrader: (2)

I cleared the code once on saturday afternoon and it just came back today...Everything was completely normal til then...

And when Bika tuned me he did tune the Ve tables.

No i havent... i will check it tomorrow after work. if i did rub through though i would throw the p0171 code for unmetered air in the system.. correct?

outtamymind

you've got a PM Schaeffer.

Bika

iTrader: (3)

like we talked about, yes it would throw p0171 if your intake had a hole post-maf.
your ve isnt perfect, but it will suffice. I have tweaked a few tables that I want to load next time i see you.

and get that ******* oil separator filter out of there.

We discussed most of those causes for the p1101 code.

Schaeffer

iTrader: (2)

Bika be cool son.. just checking other possibilities out... maybe my resonator is somehow restricting the exhaust flow being its rattling. Maybe my air filter is fucked... who knows checking mostly everything tomorrow...

Bika read post #8 checking everything from that list...that i can tomorrow.

Bika

iTrader: (3)

dont call me son, son.

maybe you resonator collapsed? doubt it but i cant listen to it so its hard to tell

and excuse me for being a concerned tuner and not wanting you to take a bunk car to florida.

Schaeffer

iTrader: (2)

haha, i know im messing with you... im leaving work early tomorrow to address this problem... and if my resonator collapsed that means im getting a new catback... lol

Bika

iTrader: (3)

i can pretty much rule out everything except the first 6 and the last one on that list based on your symptoms.

Schaeffer

iTrader: (2)

Well im off here... I must say that Bika and myself have had many phone calls over the last few hours tracking the problem down.... We realize that it is not a tune issue. Basically eveything that outtamymind told me to check i already planned on except for the fact of possible exhaust issues.....



thanks for the help. (Mainly Bika and outtamymind) well let everyone know what the problem is when i find it.......

NexTnmE

iTrader: (3)

you ever find it?

coderocks

Got the P1101 showing up. I checked all the duct work from the filter to the supercharger. The factory intake was loose. The filter and MAF sensor that I installed (AEM) were just fine. The tube that connects from the MAF to the super charger was loose. after tightening it, it cut itself off. when going over the mountain today, It came back on. Got p1101 and something else for system too rich. the LTFT on my car is around -16 (leaning from being too rich to begin with, if too much air is entering the engine, why would it lean itself?). I cleared it. Does anyone think tightening the tube could have lessened the air going into the engine and the vehicle is starting to run rich, from less air? I will post further updates!!!

killianss

This is interesting post. I got the same code in my car but at the same time im getting the supercharger bypaass code as well. And the system too rich code. Im going to bring it in to the dealership this week. Do you guys think they will be smart enough to actually fix. This issue? Generally they blame the intake and take your $$ haha