Bad MAF sensor?

**kovic** · 03-25-2014

Hey Guys, I have a 1997 grand prix gt. Recently bought it. It was getting great gas mileage, we did a 6 hour trip and it did great.

it started doing a random stuck at high idle thing, tracked down and fixed that, it was the TPS. In the process of trying to find the problem I cleaned the IAC, and the MAF sensor (with maf cleaner).

Now it is getting terrible gas mileage, can literally see the needle drop on my way to work, and 20 minute highway drive.

Car idles and runs great besides that.

Is there a chance I may have dirtied up the maf, or even broke it while ill cleaned it?

Any ideas?

Thanks guys

kov

**dsmuts** · 03-25-2014

try unplugging it and see if it's better.

**2007GPGTSC** · 03-25-2014

Aslong as the wires weren't touched or disturbed you probably didn't break it. Like Dan said try unplugging it and see if it changes also insure that it's plugged in

**kovic** · 03-25-2014

Oh unplug it and actually drive it like that? That wont cause any other issues?

kov

**dsmuts** · 03-25-2014

Won't cause any major issues

**kovic** · 03-25-2014

Ok, how long would you recommend I leave it unplugged for?

Thanks

kov

**HighOctaneRacing** · 03-25-2014

If you wind up needing a new MAF, I have a brand new Delphi MAF, P# AF10125, for sale. It's specifically made for the 97 year

**dsmuts** · 03-26-2014

Just leave it unhooked for a day or 2 to see if it makes a difference. 97-98 take the sane maf

**HighOctaneRacing** · 03-26-2014

No Im pretty sure the MAF is different on the 97 and 98-03 is the same

**dsmuts** · 03-26-2014

Nope 97-98 & 99-03 I'm positive

**HighOctaneRacing** · 03-26-2014

your right the sensor fits the 98 as well but not 99-03

**dsmuts** · 03-26-2014

That's what I was saying 97-98 is one and 99-03 is the other style.

**kovic** · 03-26-2014

Glad you guys got that figured out

. Anyways, just an update, Before I unplug and drive it, i wanted to try something else really quick, I thought maybe when i sprayed out the iac port maybe some the the throttle body cleaner/grime got on the maf, so I just took it out and re cleaned it, so ill see how that goes.

Side note, the random high idle when put in park happened again, thought i had it fixed by changing the tps (there was a code for that) but I guess not. Put it in park and the idle jumped to 2500rpms for a few seconds then went back to normal.

kov

**dsmuts** · 03-26-2014

That could be the iac being bad

**kovic** · 03-26-2014

I was wondering that, but someone told me an iac stuck open would not cause that high of idle, but I do think its a possibility. It was incredibly dirty and carboned up when i went to clean it.

Anyway to test it?

kov

**MattF** · 03-27-2014

Is your car actually running low on fuel? If it doesn't seem like the fuel is being used up as much it might be the sensor in your fuel tank saying how much fuel is in there. Otherwise I would change the MAF sensor completely and make sure the TB is real clean.

**dsmuts** · 03-27-2014

It would cause a very high idle if the iac was stuck.

**HighOctaneRacing** · 03-27-2014

I agree. Clean the IAC valve or replace it. they are reasonable price but get an ac delco one.

**kovic** · 03-27-2014

Ok, I was going to replace the iac, but the only thing that confused me is that it seems to be related to the gas pedal. Like it happened on me, got stuck at 2500 rpms, i tapped the gas to see if it would release but everytime i hit the petal it would just increase the idle. However when I go look at the engine, the throttle is completely closed.

Can it still be the iac?

kov