1991 Honda Accord Engine revs up and down when warming up

Tiny
71ELKY4FUN
  • MEMBER
  • 1991 HONDA ACCORD
  • 4 CYL
  • FWD
  • MANUAL
  • 260,000 MILES
Hello, my 1991 Honda Accord has recently started reving up and down when the engine is cold or has been sitting for awhile. The engine will rev to about 2000 rpm and then drop down to about 1300 rpm over and over again until the engine is completely warmed up. Do you have any suggestions on a fix?
Saturday, April 26th, 2008 AT 10:39 PM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

Ask your mechanic to inspect for vacuum leaks, and check the idle air by pass system for faults. Start here.

Mark (mhpautos)
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Saturday, April 26th, 2008 AT 11:39 PM
Tiny
BRUCE HUNT
  • MECHANIC
  • 3,753 POSTS
Without taking it to a mechanic or first, check the coolant level in the overflow and radiator. Make sure it is full of coolant. When the coolant gets low and air gets in the system this allows air to set on sensors and causes faulty readings and confuses the computer causing it to over compensate with more fuel then less fuel. Purge the system of air. Then as you have been told check the system for pressure and the ability to maintain the proper pressure the system requires.
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Monday, April 28th, 2008 AT 8:51 AM

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