2002 Ford Expedition

Tiny
JIMMY352
  • MEMBER
  • 2002 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 85,000 MILES
When I accelerate hard from a dead stop I get alot of surging and a lack of power, what could it be?
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Saturday, June 13th, 2009 AT 1:11 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Has the check engine light come on? Also, does the engine run good after pulling out and does it seem to have good power?
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Thursday, June 18th, 2009 AT 11:58 PM
Tiny
JIMMY352
  • MEMBER
The check engine light has never come on, and the only time the surging stops is when I let out of the throttle or when it shifts, other than that the power seems to be ok. I guess it would help if you had a little more info, I have installed a cold air intake and a dynamics tuning chip, if your not familiar with dynamics tuning it is a resister type chip that plugs straight into the mass air connection leaving the wiring for the mass air unconnected, other than that the engine is stock. I bought it used and don't know if it's ever had a tune up, so would worn out spark plugs or coil caps be causing it, or could it be something else?
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Sunday, June 21st, 2009 AT 7:57 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I don't think a general tune up would help this. Did the vehicle do this prior to the chip? Also, to me it sounds like a throttle position sensor or idle air control valve problem.
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Sunday, June 21st, 2009 AT 8:30 PM
Tiny
JIMMY352
  • MEMBER
It didn't do it prior to the chip so maybe the chip is the problem but I don't know, the other day I tested it to see if it would surge any other time than just from a stop and everytime I would step on the throttle to get maximum power it would surge, whether it was from a stop or if I was passing it would surge until it shifted or until I let out of it.
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Thursday, June 25th, 2009 AT 7:28 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
If I had to guess at this point, I would say it's the chip you used. Can you remove it an try it that way?
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Thursday, June 25th, 2009 AT 8:29 PM

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