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s10 spark knocking


wgazelda
04-25-2008, 07:14 PM
I have a 1991 S10, 2.5 vortec engine with automatic transmission and it has started spark knocking with regular gas. It has 170,000 miles. Can anyone tell me what the problem might be?
MT-2500
04-26-2008, 10:28 AM
Check EGR valve operation.
If not working it will cause spark knock.
MT
Chris Stewart
04-26-2008, 04:41 PM
I had a 2.5L Pontiac Iron Duke in an '86 Cutlass...1 fine engine.
Does it idle good in gear?

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