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RPM's reving while in park

Tiny
ATREJO.MICHEBAG
  • MEMBER
  • 2004 HONDA ODYSSEY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 72,000 MILES
Hello. I have a 2004 Honda Odyssey.I just recently took it to Honda and they couldn't find a problem. The first time the car acted up was when I had got stuck in the snow after our major snow storm when I had been stepping on the gas while spinning the tires and then trying again in reverse. Sometimes when the car is in park, the RPM's will rev up to about 1 1/2 and then drop, rev and then drop repeatedly. For no appearant reason. Recently it has started acting a little funny while driving. Say I'm driving and accelerating the gears seem to shift fine, but if I back off the gas pedal the RPM needle will drop and kind of flop up and down for a few seconds. Honda guessed it was either the Idle Air Control or the Throttle Body. They cleaned a whole bunch of carbon off the idle air control and thought that might fix the problem, but it seems to be getting worse. How do I know which is causing the problem? Thank you!
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Sunday, March 27th, 2011 AT 2:11 AM

4 Replies

Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
If you don't have a vacuum leak, it is the idle air control valve acting up. It might have to be replaced, if cleaning it didn't help.
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Sunday, March 27th, 2011 AT 10:23 PM
Tiny
MOLSONCANADIAN
  • MEMBER
  • 81 POSTS
Did you check the PCV Valve?
It my have degraded in the snow/cold and probably causes the revving when shaken. It may be the culprit.
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Monday, March 28th, 2011 AT 5:31 PM
Tiny
GLP
  • MEMBER
  • 29 POSTS
This same problem happened to my 2003 Odyssey a couple of months ago (exact same symptoms). Replacing the IAC valve fixed it (paid $130 for the part). I tried cleaning it first and that didn't work. Honda should have tried replacing it after cleaning it didn't work, did they?
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Wednesday, March 30th, 2011 AT 2:56 PM
Tiny
HONDA TECH 1818
  • MECHANIC
  • 536 POSTS
A faulty IAC valve.
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Tuesday, April 5th, 2011 AT 5:49 AM

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