Got trouble code P0103 Mass Air Flow (MAF) Sensor Circuit High Frequency -PCM last night when coming on the the car in 3rd on the highway and shifting to 4th gear the CEL came on. The car also seems to go into some sorta limp mode and pulls a bunch of ignition timing after a WOT run in 3rd and through some of 4th once I let up on it. It also dumps lots of fuel to cool things down according to my A/F Gauge when this happens. It take a couple minutes for it to come out of it. Should I clean the MAF? Whats the best way to clean the MAF?

 

I don't think the MAF is the problem. Sounds like something else is screwed up.

 

This is the first time I've really run the car hard with the GM Reflash done. What else could it be?

 

nope thats an intake problem. I threw the same **** way back in the day all the time and it seemed like i was the only one. welcome to the club. Put back on your stock air box and do a welfair mod. When my car would pull timming it took like 2 ours of hard driving to bring almost all of it back or 3 day of regular driving. nothing serious but like i said its the intake to blame it on.
edit: I can't even makje a guess as to why the car does it but i got rid of mine by running a little richer with the stock slightly more restictive filter.

 

SO it's got something to do with my Injen CAI? Why would this happen?

 

beat the hell outta me our pcm acts real finicky with the parameters these guys set in it. I'm sure others are gonna chime in soon but trust me its your intake. The pcm wants the car to take in a little less air i guess for the amount of fuel its using. Like me sounds dumb but when i had the intake mod and nothing else back in my early noob days i was throwing that code and a lean code. Put on my pulley and i guess things evened back out to within reasonable allowences and the code now only comes back with rain + high humidity. I sure others will chime in with there feelings but your the only other one iv'e seen make a post about throwing that code besides me. Maybe theres other but back when i was throwing it no one new what to do. I had to just play around with it my self. Oh yeah a k&n filter brought it back more often. So i just get things done on the stock filter.

 

When I threw that same code I found out it was from screwing around in one gear too long, my header was also a cherry red color when I went into limp mode (looked under the hood, smell a burning smell). My intake had nothing to do with the code it thrown other then that it the car was not going to accept any more air and it pissed the sensors off. Honestly, the car would not go into limp mode simply because of your intake. It might make the computer freak but it won't pull ignition timing, sounds like you overheated like me.

 

actually yeah your car could go into limp mode over an intake since the maf is right there. IT don't like what its reading its over. Anyway Its a maf code for christ sakes the sensors at the o2 sensors wouldn't bother it. one the air is read and pasted it thats it. Its not gonna hit a clogged cat go back through the system and bother the maf. And i also had a clogged cat 3 TIMES never once did i throw that code during any of those time. (Edit: when i think about it second time clogged cat had that code during the final 3 days up untill i got the car fixed). BUT.......Instead of raggin on your opinion on the subject like a child i will say anything is possible. So Blackss/sc go check out what sneaky said too. Look at me trying to be mister cobalt know it all. I need to relax. sorry sneaky

 

According to the Interceptor gauge it pulled tons of timing. I think my cat may be back, when I get on it hard and then stop somewheres the exhaust stinks very bad like rotten eggs. I'm gutting the cat very soon. The coolant temp never when up at all.

 

hahahaha sounds like you got some cat ownage problems there my friend. But honestly when my cat was clogged it never really pulled timming but car got really slow.

 

I think what is happening is the cylinder temps are getting too high so the car pulls timing and adds fuel to cool the pistons and cylinders. This was the first time the CEL came on. It goes into this limp mode all the time when I give er but the CEL has never came on. Maybe two different things are going on.

 

fix the cat ASAP thats what caused me to have all the exhaust problems

 

P103 means that the MAF is reading unmetered air from somewhere as the airflow is translated into a voltage or frequency, more airflow = higher frequency. It went above tolerance on WOT which will give the P103 if you have a leak somewhere, usually B4 the MAF. I threw that code 2 weeks ago at the track right after I put in Stage 1. I am willing to bet money that you have an intake leak somewhere. I took off the fender liner to clean off the MAF as I was at wit's end and low and behold the filter was off and loose! I bought a t bolt clamp and hasn't come back since. The Stage kit reflash does get rid of the CEL so if you get a code check the intake for leaks.

 

I'm gonna check for an air leak as well. How did you clean your MAF?

 

Going by your signature it looks like you're running the Intense kit AND the Stage 1 kit? I don't think this is a good idea. Intense created the kit based on the stock tuning of this car. Ditch one or the other. Cleaning the maf won't help. I had the lean code with my CAI, but my car just eventually relearned the fuel curve, and the cel went off.

stage 1 + intense kit ='s problems

 

Since the MAF-T alerts the MAF signal I would say that would be a place to start.

I have gotten that code with my DTEC but I am scaling the MAF signal up. The MAF-T scales it down correct?

Also if you have the stage 1 reflash then you have through more into the MIX. Since stage 1 is setup to deal with 42.5 lb injectors what are you using the MAF-T for?

 

I'm not using the MAFT right now. I turned the switchs to "NO CHANGE" so it's just like not even having it right now. I think the MAFT can scale the Maf signal up or down. There's two knobs on it to richen or lean WOT and BASE by 2% at a time. But I'm not using it now anyways.

 

Checked the MAF and also checked for intake leaks. There wasn't any leaks and the MAF was clean. I don't understand why it keeps going into limp mode after I floor it. Even if I floor it in 3rd to 7000rpm and hit 4th the car keeps going into limp mode. Anyone know why this keeps happening.