I have a 95 z28. My engine light is constantly on--except when I'm at a complete stop. When the light is on, the fan seems like it is working--it's exceptionally loud. When I scanned it, it said something about irregular voltage to the air pump....I also noticed the fuse (air pump) consistently gets blown...
Has anyone else expereinced this problem..if so, how do I fix?

New air pump?

 

When i still had my A.I.R. pump i had the same problem and had to replace the A.I.R. pump and problem went away.

 

It is a problem with your air pump. The fans come on because when the fuse blows the PCM goes into limp mode. I have a brand new still in the GM box air pump if you are interested. CLICK HERE TO EMAIL ME

 

There is a factory recall on the 1995 and newer AIR pumps - free repair. Check with your dealer first.

In the meantime, unplug the harness connector from the side of the AIR pump. Put a good fuse in the circuit. The SES light will go out, the fans will behave normally. Works on OBD-I only.

"Limp home" mode is something much more severe than the PCM's response to the DTC 29 (= Secondary Air Injection (AIR) pump circuit, the only code in OBD-I for AIR). Turning the fans on is not quite the same as "limp home", which is only used when just about every input to the PCM has failed.

 

Thanks for your help guys!!!