Unstable idle speed - Engine Troubleshooting


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Unstable idle speed

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

Squarehead
New User

Mar 22, 2014, 11:40 AM

Post #1 of 4 (1700 views)

Unstable idle speed	Sign In

I have a Toyota Corolla 2003 and I bought it at the begining of winter. When I start it, the engine runs at 2000-3000 RPM, witch is normal at winter's temperature. Then it slows down a bit, witch is still normal.

Then, after a few minutes, the engine's speed slightly raises, then go down to normal... It does that a few times when the car is idle.

Is it related to a bigger problem? how can I fix this?

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Mar 22, 2014, 11:54 AM

Post #2 of 4 (1692 views)

Re: Unstable idle speed	Sign In

When the engine is at full operating temperature and idling, does it do that?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

Squarehead
New User

Mar 23, 2014, 5:05 PM

Post #3 of 4 (1631 views)

Re: Unstable idle speed	Sign In

Yes it does, even after I made some road and with the engine warmed up.

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Mar 23, 2014, 5:36 PM

Post #4 of 4 (1626 views)

Re: Unstable idle speed	Sign In

AC compressor engaging and disengaging, electrical cooling fans going on, or other electrical loads powering up may cause the idle speed to increase. ECU does this to compensate for the load put onto the engine.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Mar 23, 2014, 5:37 PM)

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