There's got to be a solution??? (THERE IS, PROBLEM SOLVED!)

[VehiGAZ]

MAF = Mass Air Flow (sensor)
MAS = Mass Airflow Sensor
MAF = MAS? I've heard them used interchangeably. Autozone lists our MAF as an MAS. I'm just speculating... I'm supercharged, so all of my plumbing is different. But it would be helpful to identify what part you mean by part number or full description.

I don't think there is a separate intake air temp sensor - the MAF measures this value (since it measures airflow by it's temperature and how much current must be put through a heated wire to maintain temperature).

Anyway, surging idle often is associated with unmetered air getting into the intake, often through cracked intake gaskets. Try the carb cleaner test - this may identify the problem. If not, check for any poorly-fitting intake components that may be letting unmetered air in.

If you run an oiled air filter (like a K&N) you may have mucked up the MAF to the point that cleaning it won't help. CRC is the only company that makes an MAF cleaner - if you used a regular electrical contact cleaner, it may not have done anything (it made the MAF on my 928 worse!). I would suggest getting a NEW MAF (no rebuilds!) and see if your problems go away. The MAF could just be dying, too. It happens. It's an evil part - just because it's so critical to fuel injection. If it's off, so is your fuel-to-air ratio.

The acetone you have been experimenting with wouldn't affect the MAF.

Good luck!

[VCrossfan]

Get a MAF/MAS from Napa (They carry some oem) and try it and if it doesn't work return it. But being electronic make sure they will take it back. It gathers info on the amount of air going in and tells the computer how much fuel to deliver...worth a try.

[WormGod]

I have had this exact issue for a couple months now. The fluctuating idling at startup that. If it happens to stall during these fluctuations, I get a CEL. ONLY if it stalls though. Did the whole new Air Filter, cleaned MAF, cleaned EGR, and it was good for about 2 weeks, but it came back. The scary part is, if the VX isn't running at a normal temp/warmup, it will do it. and when you are stepping on the brake and it suddenly wants to rev, you gotta be ready to step on that brake just a bit harder. Once she is warmed up, she cuts that out though.

I have been trying to troubleshoot whether I was running lean or rich. Both can cause fluctuations, but both also have different exhaust signatures. I don't have dark emissions so I am leaning towards running lean. My next step is to replace the FPR and clean the S/C fuel rails, in case of some residue/blockage. Probably replace the EGR while I am at it. I have been saying this for a few weeks now, but with tight pockets and winter starting to shadow me, I think I am allowed to continue to procrastinate.

[VCrossfan]

I think I am allowed to continue to procrastinate.

lmao...Classic

[iamironman]

I will try everything suggested... but... is there a way to adjust the rich/lean? Or is it totally controlled by the MAF/ECU? Or other sensors communicating with the ECU.


THANKS!!

[Solitude]

I will try everything suggested... but... is there a way to adjust the rich/lean? Or is it totally controlled by the MAF/ECU? Or other sensors communicating with the ECU.


THANKS!!

I am probably speaking out of turn here.. but I think the only way to adjust the parameters is with a computer and isuzu software. These don't adjust like a carb.

good luck
Jeff

[iamironman]

I thought so... thanks for all the info. I ordered the FPR and MAF/MAS... 'twill be here tomorrow...