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Pinging 4.0 OHV, tried most solutions.





nameiztaken

Member
Joined
June 9, 2021
Messages
38
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14
City, State
California
Year, Model & Trim Level
1991 EXPLORER XL
You have diagnosed your own problem! No EGR!
I feel like these didn’t come out of the dealer lot pinging though, maybe the lack of EGR contributes a fair bit.
 




Roadrunner777

Explorer Addict
Joined
February 5, 2011
Messages
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City, State
Bemidji, MN
Year, Model & Trim Level
94 4x4 Sport 88k
Looking though your list, you have tried everything I can think of except the main computer, which I suppose could have failing caps screwing something up.

I bought my ex well used, and when I test drove it, I heard some minor pinging, and I just about stopped right there but I happened to see in the '94 owners manual, it does say to expect pinging in certain circumstances. And I imagine the reason for the octane jumper was to satisfy new owners that objected to the pinging. Of course messing with the jumper reduces power and mileage too.

My gut feeling, without clear evidence to back it up, is that you have carbon build-up that isn't getting fixed with the seafoam. You wrote earlier you might just run premium gas and live with it. That is what I would do.
 




nameiztaken

Member
Joined
June 9, 2021
Messages
38
Reaction score
14
City, State
California
Year, Model & Trim Level
1991 EXPLORER XL
It appears switching to Motorcraft AWSF-42CA spark plugs has solved most of my detonation problem. I will update if I figure anything else out.
 




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