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2004 Ford Explorer bucking when decelerating

Tiny
BO1839
  • MEMBER
  • 2004 FORD EXPLORER
Engine Performance problem
2004 Ford Explorer V8 Four Wheel Drive Manual 62xxx miles

while the engine is warm and I am driving up an inclne between 40-50- mph if I decelerate or let my foot off of the gas the vehicle begins to buck about 8-10 times in a two-three second phase then stops it feels like something is going to fall off the vehicle
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Monday, March 15th, 2010 AT 10:07 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Has the check engine light come on?
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Monday, March 15th, 2010 AT 10:09 PM
Tiny
BO1839
  • MEMBER
  • 3 POSTS
No check engine lights. It is at the dealer and they say they cannot find anything nor has the diagnostic shown any codes.

Recently (2mos) ago the head was warped it was taken off and milled down. When I received the car back it was doing this bucking I took it back and they told me they replaced all 8 sparkplugs. 2 months later it's bucking again
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Monday, March 15th, 2010 AT 10:16 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
The only thing I can say is check for vacuum leaks, a sticking TPS.
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Tuesday, March 16th, 2010 AT 6:27 AM
Tiny
BO1839
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Whats a sticking TPS?
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Thursday, March 18th, 2010 AT 9:11 AM

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