mass air flow...

changed the Air Filter & mass air flow sensor

removed Code...all is good until i restart the engine, code comes back

i remove code while idling, no code while driving

turn off engine, later restart, code is back

i did notice before changing the sensor, engine was idling irratik, since new sensor
engine not running smoothly

any idea's

2009 Turbo with 50000K

 

What code # there are multiple for the mass air flow sensor

 

at work will look into it later

 

I have no idea because you haven't given us a code # yet

My first guess is broken intercooler, <This is a guess not a diagnoses.

 

I'll second the guess

 

Po 100 Mass air flow or flow sensor...circuit malfunction

 

Check the connector wires

 

up-date...

clear code, turn off key wait 2 minutes turn key on without starting engine

code is back, clear code again repeat, code comes back

checked wiring all seems ok, no broken wire

 

You're going to have to follow the wires back to the ecu. The code cause from https://service.gm.com/gmspo/mode6/p...F%20Engine.pdf says the monitored voltage of >10.5V

 

OP did you use a GM part for the replacement