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Occasional Detonation


Poobah

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Sometimes, lately, when I do a WOT or hard acceleration I get some fairly severe detonation. Usually when I get on it, there isn't any detonation but it has been happening often enough lately to concern me - I know it isn't good for the engine.

I'm not getting any codes. I've always used premium gas. I replaced the EGR valve, cleaned out the passages, mouse holes, phenolic spacers, etc. about 20,000 miles ago.

The only other possibly related symptom is an occasional very slightly rough idle that is just barely noticable. I replaced the plugs and plug wires with O.E.M. about 15,000 miles ago.

Any suggestions as to the cause of the detonation?

Thanks.

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Happiness is owning a Cadillac with no codes.

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No detonation on start-up but I have noticed that the miles on a tank full of gas vs. the fuel used adds up to better milage than the average MPG per the computer lately. Could this be an indication of running too lean?

photo-36.jpg

Happiness is owning a Cadillac with no codes.

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