Mass air flow

[french7777]

I have a 98 gmc 6.5 diesel and it has a maf sensor can anyone tell me what it is for since I thought diesels don't need one and what would happen if you had sensor fault thanks

 

[THEFERMANATOR]

Sounds like you have a S engine, or the EGR equipped emissions engine. On some 2500's and 1500's from 97-99 GM had to put a MAF sensor in to help meter the fuel delivery better for emissions reasons. You can get a custom F engine(non EGR engine) tune for the ECM and do away with it.

 

[french7777]

thanks for the answer but i was wondering what it does to fuelling if it has a fault code

 

[THEFERMANATOR]

thanks for the answer but i was wondering what it does to fuelling if it has a fault code

If it has a problem it will throw a P0101, P0102, or P0103. It does control how much fuel the ECM will give though on an S engine.