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RPM's sticking

Tiny
JGANAWAY
  • MEMBER
  • 1993 FORD F-150
  • 4.9L
  • 6 CYL
  • 4WD
  • MANUAL
  • 270,000 MILES
Occasionally, the rpm's will stay around 2,000 rpm's for about 30 seconds or so when the clutch is pressed. While driving when this happens, if I turn the ignition from run to on (not completely off), and back to run the rpm's drop like they are supposed to. I have replaced the IAC, TPS, MAP sensor, vacuum lines, EGR, intake temperature sensor, coolant temperature sensor and recently, replaced the oil pan, valve cover, throttle body, upper and lower intake/exhaust manifold gaskets. I'm stumped.
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Wednesday, July 29th, 2020 AT 6:10 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Wow, lots of parts with no result.

Did you check the cables to the throttle body to be sure they are free and not sticking?

https://www.2carpros.com/articles/engine-idles-too-high

I would disconnect the cables and rev the engine manually and see if it still hangs up.

Roy
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Wednesday, July 29th, 2020 AT 6:50 AM

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