1998 Ford Explorer Popping Thud Sound Misfire Park Rev Engine Red Line Fast

1998 FORD EXPLORER
89,000 MILES
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JTORZEWS
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  • 3 POSTS
Popping /thud/sound like a misfire. When in park I can rev the engine up to red line fast/slow hard/soft with no issue. Engine seems fine. Put the truck in drive and under hard accel I get the pop or thud. Sounds like drivers side near the floor board. I tried a brake torque ( foot hard on the brake while giving it gas) and it also popped/ thud. Scratching my head on this one.
Feb 24, 2013 at 11:12 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
never red line the motor. not made to do this with the age and mileage.

does it feel like a backfire???

Roy
Feb 24, 2013 at 11:13 AM
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JTORZEWS
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Yes. I let off and it is fine. Seems to be only on hard accel in drive. I didn't take I all the way to red line just up to about 4K. Again no issue while in park.
Feb 24, 2013 at 11:17 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
i would look at some basics like plugs/coils. how old are they??

roy
Feb 24, 2013 at 11:25 AM
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JTORZEWS
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About 3-4 years old. Just changed the wires. I would think if it were engine related I would get the sound in park also....
Feb 24, 2013 at 11:28 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
may only do it under a load

roy
Feb 24, 2013 at 11:35 AM
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