1997 Chevrolet Pickup Bad Idle and Vibrations


#1

My 1/2 ton pickup is making abnormal sounds while running, idle and on the road. It has 197K, so it is rather worn. The sound is like a constant huh huh huh huh huh huh huh. It was a little chilly this morning, and I was able to see the fumes, not smoke, from the tail pipe. I can obviously see that it is not a constant thing…it puffs out. huh huh huh huh huh huh huh huh huh huh


#2

Any misfiring? The puffing noise you mention reminds me of an open spark plug hole.

Yes, I know you said you didn’t see any smoke from the tailpipe.

Lets see what the others have to suggest.


#3

Well, I just had a mechanic tell me today that the injectors are ruined and need replacing. Also, the O2 sensor is bad. Does this sound correct?


#4

If the O2 sensor was ‘bad’, you would have had a SEL or CEL. If so, find out the code number and post it here please.


#5

what fuel sys, do you have ? TBI,CMFI,MFI?

maico