Re: 91 Burb w/ 7.4L


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Posted by Frankenbiker (32.128.147.149) on 21:41:50 07/17/07

In Reply to: Re: 91 Burb w/ 7.4L posted by 92sub

: I once bought a K5 Blazer real cheap because they couldn't fix this very code!
: First off, the EGR code is set when the computer notices that the block learn integrator (fuel trim) is outside a prescribed window when EGR should be flowing. Instead of explaining this, lets just say your computer does not like where your fuel trim is at (obviously only during tow) and it's tricked into thinking your EGR isn't working. My K5 had spark plugs so old that the electrodes were GONE! Yours probably just needs some tune-related work to get it back into the happy 'window' of operation. Check the easiest (plugs, correct ACDELCO PCV valve, fuel/air filter, check for vacuum leaks and make sure the MAP sensor hose/port isn't gunked up).

Those are probably the easiest things to do.

Code 32 is probably the most notoriously difficult code to properly diagnose, 1) because it's so vague, and 2) because there are are a host of reasons for the computer to throw it.

IIRC, there was a thread on Full Size Chevy many moons ago about diagnosing it. I'm still looking to find if my memory is faulty.

-blaine



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