Throttle body replaced now high idle

Tiny
MICHAELDGOD
  • MEMBER
  • 1995 FORD E-SERIES VAN
  • 5.8L
  • V8
  • MANUAL
  • 200,000 MILES
Just replaced my throttle body with a salvaged one (as they are no longer being made) Now my vehicle has an extremely loud/rough idle. I have tried running the engine for three minutes shutting it off and restarting for another three minutes with no avail. Please advise.
Thursday, April 13th, 2017 AT 3:37 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 34,330 POSTS
The best suspect is a leaking throttle body gasket. Unplug the two-wire connector to the idle air control valve. If the gasket is leaking, unplugging the valve will not lower the idle speed. Spray some water around the gasket while the engine is running and still cold. If you see or hear it get sucked in, and engine speed changes, watch wear that water gets sucked in. Watch around the throttle shaft too. If the bushing is worn, the shaft can move away from the seal.
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Sunday, April 16th, 2017 AT 2:21 AM

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