intermittent jerking while driving. MAF reading fluctuates
#1
intermittent jerking while driving. MAF reading fluctuates
Usually after driving 10 miles or more, the car balks and jerks, sometimes dies at stops. Mass Air Flow reading shows fluctuation of voltage when engine is acting up. Up and down voltage reading. Then all may be okay for 4 or 5 minutes. Sent for new M A F sensor, but not sure that is the problem. I hope it is, but the MAF Sensor on the car is only a year or so old. In fact, the last time I had to buy one, I had to get three before I found one that worked okay. Expecting new one in the mail soon.
Put new PCV vlave on already. No help. Anything else might cause this problem? Any other sensors that might cause this? 2001 Monte SS 3.8
Put new PCV vlave on already. No help. Anything else might cause this problem? Any other sensors that might cause this? 2001 Monte SS 3.8
Last edited by stumped; 05-14-2018 at 03:42 PM.
#2
You could always just unplug the MAF to rule it out. You'll fail it out and it will run off your VE tune instead.
Other common issues when you have a warmed up car is the oxygen sensor, fuel-pressure regulator, or even a catalytic starting to fail.
Other common issues when you have a warmed up car is the oxygen sensor, fuel-pressure regulator, or even a catalytic starting to fail.
#4
If you unplugged the MAF and are experiencing the same issues, then I wouldn't think the MAF was bad. You've just ruled out the MAF being the problem. Car should run fine without a MAF, just may be a little richer.
#6
On a supercharged 3800, is the fpr part of the fuel rails or can it be removed from them?
#7
Thanks for replies
The new MAF came and was installed yesterday. Today the Monte drove without jerking and seems to run fine again. (Fingers are crossed). I can barely believe though how big brand name auto parts manufacturers are gouging people. MAF by AC/Delco was about $184. Other brand names were not much less and some were even more. The one I bought was less than 1/10 the price of those and works fine. It is not just big pharmaceuticals that are gouging. Again, thanks for the tips and replies.
#8
The new MAF came and was installed yesterday. Today the Monte drove without jerking and seems to run fine again. (Fingers are crossed). I can barely believe though how big brand name auto parts manufacturers are gouging people. MAF by AC/Delco was about $184. Other brand names were not much less and some were even more. The one I bought was less than 1/10 the price of those and works fine. It is not just big pharmaceuticals that are gouging. Again, thanks for the tips and replies.
Honestly I would be very grateful if you did so..
#9
If the MAF truly was bad, you want to reset the car's fueling parameters and let it relearn again with the proper reading from the MAF sensor