throttle doesn't come back to idle.

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Nov 3, 2007 | 08:09 PM

Zora55_56

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7th Gear

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throttle doesn't come back to idle.

Thorttle sticks at 1500 rpms. When you tap the gas it comes back to 500 rpms. I've tried wd40 and an additional return spring.
Help.

Nov 3, 2007 | 08:31 PM

jsup

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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan

When that happened to me, it was the injectors.

Nov 3, 2007 | 08:32 PM

CFI-EFI

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From: The Top of Utah

More than likely the bores in the TB casting are worn and need to be bushed or the TB replaced.

RACE ON!!!

Nov 3, 2007 | 09:33 PM

Zora55_56

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7th Gear

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I Changed them. No cheange in problem.

Nov 3, 2007 | 09:34 PM

Zora55_56

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7th Gear

Joined: Jan 2007

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Quote:

Originally Posted by CFI-EFI

More than likely the bores in the TB casting are worn and need to be bushed or the TB replaced.

RACE ON!!!

Sounds ike a possible reason. I'll check it out

Nov 4, 2007 | 09:30 AM

Zora55_56

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7th Gear

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I scrubbed the bores and the pivot points at the butterflies, used brake clean,then wd40.
The result is no more sticking at 1500 but it idles at 1000. Maybe the computer needs some time?

Nov 4, 2007 | 09:53 AM

Sam Lam

Melting Slicks

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From: St. Charles, MO Route 66 Corvette Club

Zora55_56: I cannot determine what year of car you own since you have not completed your profile. Please do this when you have time and advise if you need help on this.

Assuming you have a L98 engine, I would recommend the next step would be to adjust the base idle of the engine. Do this before you start throwing new parts at the problem. I have a copy of the Gordon Killebrew procedue for doing this important engine tune up procedure. Please advise if you want a copy.

Nov 4, 2007 | 01:56 PM

CFI-EFI

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From: The Top of Utah

Quote:

Originally Posted by CFI-EFI

More than likely the bores in the TB casting are worn and need to be bushed or the TB replaced.

Quote:

Originally Posted by Zora55_56

I scrubbed the bores and the pivot points at the butterflies, used brake clean,then wd40.
The result is no more sticking at 1500 but it idles at 1000. Maybe the computer needs some time?

The bores for the throttle SHAFT where it turns and wears in the pot metal, TB, casting, as the throttle is worked, not the throttle plate bores. Now that the "pivot points" (shaft bores?) are cleaned up, some lube in them may help, temporally. The computer doesn't need time to learn. The minimum air, refered to above as the "base idle", adjustment procedure is also in your FSM.

RACE ON!!!