High idle when first started

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Nov 14, 2003 | 01:51 PM

FordSun

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Posts: n/a

High idle when first started

When the car first starts the idle is about 1500 RPM. If I drive it for about 5 min and shut off and start again the idle is 900 RPM. Any thoughts?

Nov 14, 2003 | 03:08 PM

86ZXTurbo

Registered User

Joined: Mar 2003

Posts: 117

From: San Leandro, California

Its doing exactly what its supposed to do. when a engine is cold it idles faster to get the engine warmed up quicker. just be easy on the engine till it gets up to operating temp.

Nov 14, 2003 | 04:59 PM

Copper727

Gold Member

Joined: Aug 2003

Posts: 300

From: Chicago, IL

Re: High idle when first started

Quote:

Originally posted by FordSun
When the car first starts the idle is about 1500 RPM. If I drive it for about 5 min and shut off and start again the idle is 900 RPM. Any thoughts?

Hahahaa, my Z does exactly the opposite! On cold mornings (and evenings), it'll idle at about 700 rpm until it's warmed up nice and toasty, at which point it'll idle back to the normal 900-1100 rpm. Sometimes, on those REALLY cold days (or as cold as it could get up here in Chicago), I'll have to give it a little gas for a few seconds before letting go in order to keep it alive!

For a car that's more than 15 years old, it's normal for the engine to run very differently than when it was first off the assembly. Hey, by the way, if you don't shut off and restart the engine, does it still idle at 1500 rpm after 5 minutes?

Nov 18, 2003 | 05:52 AM

FordSun

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Posts: n/a

High Idle

No. The car stays at high idle until I turn it off and on again. It may be the Air Vane, though that is triggered by the temperature sensor (switch) when the temperature reaches a certain point. So it could be a faulty temperarure sensor also. I also noticed the car is a little hesitant under 1200 RPM. If I push the accelerator slowly it will hesitate until it gets above 1700 RPM. If I mash the accelerator then the hesitation goes away and the car takes off. Almost acts like a vacuum leak. Any suggestions?