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1999 Honda Odyssey Accelerates and desaccelerates in Parkin

Tiny
JMLOPEZ
  • MEMBER
  • 1999 HONDA ODYSSEY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 106,000 MILES
When I start the engine it accelerates an desaccelerates repetdly from 1000rmp to 2000rpm
Thursday, May 29th, 2008 AT 6:24 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi jmlopez,

The engine idling speed is too high due to vacumn leakage or a loosened idle adjusting screw.

Check the ISC and the coolant hoses to it.

Low coolant level will also cause the problem as the ISC is not getting the correct temp.
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Sunday, June 1st, 2008 AT 12:30 AM
Tiny
JMLOPEZ
  • MEMBER
  • 2 POSTS
Hi KHLow2008,
Thank you. I verify the ISC and the coolant level or leaks and found everything OK.

Today I scanned my Honda and pulled code P0505. Any ideas appreciated.
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Wednesday, June 4th, 2008 AT 10:17 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi jmlopez,

P0505 is a malfunctioning ISC.

How did you verify that the ISC is ok?

For this model if the ISC valve is short circuited and replacement of a new ISC still show the P0505 code, then you need to replace the ECM as well as the circuit in the ECM is damaged.
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Thursday, June 5th, 2008 AT 6:25 AM

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