SPONSORED LINKS

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
SPONSORED LINKS
Wednesday, April 8th, 2009 AT 1:57 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Has the check engine light come on?
Was this
answer
helpful?
Yes
No
-1
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.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, April 10th, 2009 AT 2:07 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
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.
Was this
answer
helpful?
Yes
No
+1
Tuesday, April 14th, 2009 AT 7:44 PM

Please login or register to post a reply.

Related Engine Surge Content

Surging
GUIDE
Surging
An engine or motor surge is caused by an imbalance in the computer system which cannot be corrected within the parameters of the vehicle's operating program, in other...
VIEW MORE

Sponsored links