Mechanics

BURNING SPARK PLUGS

1990 Ford Ranger

Engine Mechanical problem
1990 Ford Ranger 4 cyl Two Wheel Drive Manual 200000 miles

about 5weeks ago I was going up a steep long hill @ 70mph on I-90. All of a sudden I started to loose power and engine started to misfire. Had to shift down thru gears loosing power per gear as I did so. Temp gauge moved up quickly, thought I blew a head gasket. Got over the hill and temp needle went down rather quickly and as it did the engine regained full power but had a misfire to it. Got home and checked the plugs to find out that the #1 plug on the intake side was totally burnt and the tab on the plug was gone. These plugs were 2 weeks old. Replace the plug with a new one and the truck still runs great except up steep hills and anytime Im going faster than 58mph up ANY kind of hill. I have cut the CAT. Out completly and replaced the muffler with a new one because it seemed to not have much air flow coming out the exhust pipe. Nothing has changed except a little more horse power. So I pulled all the plugs to see if the gap was correct and called the auto parts store to make sure they were the proper plugs. I found that the #3 on the exhust side was blackened and looked bad and the #3 on the intake side was burnt like the #1 was a week ago. Replaced the burnt one and everything seemed fine so I tried 65mph on the highway again because the temp needle was reading fine and it was running great only to have it get hot and burn plugs on the intake side again. What is burning my spark plugs on the intake side so hot that the tab is being burnt off. The check engine light comes on 5 mins. After starting it and has done that since I bought it 3 months ago. The rear antilock light is on for about 5 weeks now and that started right after I replaced the rocker cover gasket.
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Mattman61
September 26, 2008.



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