idiot light - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hobbs · 03-14-2006, 08:22 AM

In my 1988 sub, 7.4 L, my idiot light “service engine soon” has been coming on. It really has not been predictable. Does not come on every trip. Usually only comes on at the beginning of the trip, and does not stay on for more than 5 min or so.

I know this light could mean a multitude of problems that are easily diagnosed by the dealer with the computer. My question is, are there any cheap/most common causes of this on and off “service engine soon” light that I could check or change before submitting to the dealer?

For what it is worth…I changed spark plugs the other day and they were clean and dry. The engine does run a little rough. Probable needs a timing adj.

Hobbs

03-14-2006, 08:22 AM	#1
Hobbs Registered User Join Date: Feb 2006 Location: Alabama Posts: 46	idiot light In my 1988 sub, 7.4 L, my idiot light “service engine soon” has been coming on. It really has not been predictable. Does not come on every trip. Usually only comes on at the beginning of the trip, and does not stay on for more than 5 min or so. I know this light could mean a multitude of problems that are easily diagnosed by the dealer with the computer. My question is, are there any cheap/most common causes of this on and off “service engine soon” light that I could check or change before submitting to the dealer? For what it is worth…I changed spark plugs the other day and they were clean and dry. The engine does run a little rough. Probable needs a timing adj. Hobbs



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