91 Burb w/ 7.4L

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Posted by PeterW ( on 21:58:53 07/13/07

Guys, I'm spent! My 91 Burb, R2500, 7.4L, 3.73 rear and 133k on the clock has me going in circles.
Here's the deal; She's my tow beast and typically is used only for that purpose. She does weekly trips to the dump but that's about it. Towing my trailer is her primary job.
Without towing, she runs beautifully, never a hiccup anywhere. However, hook up the travel trailer (5.8k lbs.) and the check engine light comes on with DTC 32 stored. This indicates an EGR problem. I've replaced the EGR solenoid and EGR valve itself and without fail, each and everytime I tow, I get the same code. Never a code when not towing.
I don't notice any dimished power or performance when the light comes on, yet it's on and driving me NUTS!
Anyone have any idea's on why it comes on while towing and never anytime otherwise?
Where do I begin? What to look for?


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