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94 Honda Civic Reving all the time when not driving

Tiny
MANOFSTEELE02
  • MEMBER
  • 1994 HONDA CIVIC
I have a 1994 Honda Civic Ex. I have aftermarket headers and exhaust, and some transmission work that has been done to it. However It started to Rev by itself several weeks ago it revs from about 1000rpm to 3000rpm. I have replaced Idle Air Control Valve, and the Map Sensor. Oxygen Senson, Sparkplugs, Sparkplug wires and it is still reving can you tell me what is wrong or maybe whatelse I can try?


D16z6
150000miles
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Saturday, March 10th, 2007 AT 9:10 PM

3 Replies

Tiny
BRUCE HUNT
  • MECHANIC
  • 3,754 POSTS
Check the coolant level and purge the air from the system. Next is to try for vacuum leaks, hoses, etc.

Had any intake manifold work done. Could be a crack or a manifold gasket that is leaking.
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Monday, March 12th, 2007 AT 9:41 AM
Tiny
MANOFSTEELE02
  • MEMBER
  • 2 POSTS
How do I purge the air from the system?
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Monday, March 12th, 2007 AT 9:12 PM
Tiny
BRUCE HUNT
  • MECHANIC
  • 3,754 POSTS
Start the car, get the engine warm, follow the top radiator hose to the block. You will see a bleeder that is a number 10 wrench I believe. Crack it open very slowly and let out steam and air. Do this a couple of times and even take it fow a short drive and repeat. See if that helps. How about the intake question?
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Tuesday, March 13th, 2007 AT 11:47 AM

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