1990 Ford Bronco II Pinging Noise
And i forgot he mentioned that... It is due for an oil change and a full fluid flush. Could it really be as simple as an oil change? BTW, what will the Marvel Myster do?
P.S. - Thanks for the fast responses!
If that doesn't do it I would likely recommend having the computer checked to be sure your timing is advancing with load
Suggested Repair
Change the engine oil and add a bottle of Marvel Mystery Oil. Treat the old fuel with isopropyl dry gas, keep at least the recommended amount of fuel in the tank, and try super unleaded. If the pinging continues, have the computer checked to confirm timing advances under load.
Conversation Summary
The owner of a 1990 Ford Bronco II with a 2.9L V6 reported a pinging noise under moderate to heavy throttle after the vehicle sat for about two months. One expert suggested a manual fuel pump issue on older models, which the owner ruled out. Another expert recommended starting with an oil change and Marvel Mystery Oil, treating stale fuel with dry gas, and using super unleaded. If those steps do not resolve it, the computer should be checked to verify timing advance under load.
