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2002 Ford F-150 RPM Surge

Tiny
JOHNTK2010
  • MEMBER
  • 2002 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 78,000 MILES
F-150, 7700, 5.4 liter,
The engine rpm has begun surging upon start-up. It settles back down to idle in about 15 - 20 seconds. The surge has been getting higher over the past couple weeks. Also, the surge is higher when the engine is cold, though it also surges when hot. Any ideas concerning cause?

Thanks,
John
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Wednesday, April 8th, 2009 AT 1:57 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Has the check engine light come on?
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Thursday, April 9th, 2009 AT 8:55 PM
Tiny
JOHNTK2010
  • MEMBER
  • 2 POSTS
No, the engine light did not come on. Other problems I noticed since the surging started is light-brown exhaust at start-up; the oil reservoir was unexpectedly low; and gas mileage has dropped approximately 1 mile per gallon. Unknown if these are all related. A friend suggested an O2 sensor problem - but I would expect the engine light to come on.
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Friday, April 10th, 2009 AT 2:07 PM
Tiny
JACOBANDNICKOLAS
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Sorry I didn't get back sooner. I had another extended stay in the hospital. I agree the light should have kicked on with the O2 sensor, but don't completely cancel that out.

Make sure the egr isn't leaking or sticking.
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Tuesday, April 14th, 2009 AT 7:44 PM

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