Surging on start-up, 4.2 quattro
#1
Surging on start-up, 4.2 quattro
I've been dealing with this issue for a while now. The first time it happened it threw on the Check Engine light. I used a scanner to read the code (P0101) and it said there was a problem with the Mass Airflow Sensor. I tired using the MAF cleaner but to no avail. I then bought a new sensor from Bosch and installed it 2 days ago. The first start up (engine is cold when this happens) went fine with no surging but when I started my car this morning it surged once again and threw on the Check engine light with the same code. I used the scanner to check if the MAF was reading and it was. I have also noticed that when i add a can of SeaFoam to the gas tank it goes away. Does anyone have any ideas on what could be causing this problem? Thanks.
Last edited by U's Audi; 01-13-2013 at 04:24 PM.
#4
know anyone with a vagcom? you need to have the readings looked at and also see if the voltage to the sensor is correct in order to diag it further - also check for unmetered air - vacuum leaks or intake tube not sealing correctly.
#5
The problem has now gotten worse. The change is that now it will intermittently stall and when I manage to start the engine(usually on the second try) it sounds like the engine is forcing itself. It is also accompanied with a whine. SeaFoam in the tank doesn't seem to work anymore. Every once in a while it does start up fine as well as when the engine is warm. Any further ideas?
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