Engine Mechanical problem
1999 Ford Ranger 6 cyl Four Wheel Drive Manual 102000 miles
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I have noticed alot of pinging in my 4.0L Ranger lately. I run 87 octane fuel and have never had a problem until now. I have tried fuel from different service stations but that has not helped. The pinging usually occurs in 3rd or 4th gear or if I am hauling something heavy in the bed of my truck. I have also noticed that the pinging only occurs when it is hot outside and the engine is to normal operating temperature. It does not ping in the mornings when it is still cool outside or when I leave work in the afternoons when the engine is still cool. When the engins is warm and the outside air is about 80 degrees in hotter it will ping. Please help.

Check engine comming on ? If so pull codes and post if not. Then check EGR vaccum to it ? Remove valve clean with carb cleaner also clean out passages in intake.
Hope this helps