high idle cold

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Jan 10, 2010 | 08:46 AM

Lewlinda1199

Thread Starter

Cruising

Joined: Dec 2009

Posts: 10

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From: Odenton Maryland

high idle cold

Here is one for you all. My 87 has started to act up. It will idle 500-600 RPM cold and stumble. As it warms up the idle increases. When fully warm it idles 1600. I have check and repaired vacuum leaks. It was intermitent for a while. If I disconnected the battery to clear the ECM it would be fine,now it is all the time. Idle Air Motor?

Jan 10, 2010 | 09:06 AM

CorvetteMike2024

Corvette Enthusiast

Joined: Oct 2007

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From: So. Cal.

2025 C7 of the Year Finalist- Unmodified

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Vette

Quote:

Originally Posted by Lewlinda1199

What codes are you clearing?

Mike

Jan 10, 2010 | 10:33 AM

Lewlinda1199

Thread Starter

Cruising

Joined: Dec 2009

Posts: 10

Likes: 0

From: Odenton Maryland

The best part is after checking codes, there are none just 12-12-12-12

Jan 10, 2010 | 11:26 AM

95BLKVette

Drifting

Joined: Nov 1999

Posts: 1,502

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From: Yorktown Heights NY

What weight oil are you using?

When was the last time you changed you IAC motor and also the air filter?

Jan 11, 2010 | 05:19 AM

Lewlinda1199

Thread Starter

Cruising

Joined: Dec 2009

Posts: 10

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From: Odenton Maryland

We bought the car in March '09 , changed the oil right away I believe I used 15/40 . We don't drive it in the winter. I never changed out the IAC motor. The air filter looked almost new.

Feb 22, 2010 | 11:45 AM

surfer92

Pro

Joined: Oct 2009

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From: vero beach florida

The vette should run 5w-30, 15w-40 is to heavy.

Feb 22, 2010 | 11:52 AM

RetiredSFC 97

Team Owner

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From: Somewhere in Mo

St. Jude Donor '09-'10, '14

Take the IAC out and give it a good cleaning with carb cleaner. Also clean the throttle body good. That is a no cost test and should give you an idea if it is bad. Don't assume it is the IAC until you try this.

Feb 22, 2010 | 11:53 AM

RetiredSFC 97

Team Owner

Joined: Jan 2009

Posts: 73,568

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From: Somewhere in Mo

St. Jude Donor '09-'10, '14

Quote:

Originally Posted by surfer92

The vette should run 5w-30, 15w-40 is to heavy.

15 40 is probably too heavy for your neck of the woods.

I run 10 30 in my L98. The first number is for start up the second is for warmed up engine.

look at your book and do what it says to do. JMO