Keeps running

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Apr 5, 2011 | 01:49 AM

dglad

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From: Beloit Wisconsin

Keeps running

Have a 2000 vette this just started where after inshut it off it will keep running what would cause this? It doesn't do it all the time but once in s while thanks.

Apr 5, 2011 | 02:09 AM

DeeGee

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From: Horncastle Lincolnshire, England

2023 C5 of the Year Finalist - Unmodified

Smarter engine guys than me will comment

Not a problem I've seen for many years but the usual candidates for engine run on are:

Using low octane gas (but we have a knock sensor to compensate)
sticking throttle idle allowing the engine to idle too fast
badly adjusted timing
A bad thermostat allowing the engine to run hot

Apr 5, 2011 | 02:29 AM

dglad

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From: Beloit Wisconsin

Thx for the reply as far as I can tell it's not running hot at least by the Gage it idles at about 4-500 rpm's and I have been using 93 octane gas.

Apr 5, 2011 | 05:23 AM

ZZ06

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Joined: Sep 2007

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From: Goldsboro NC

if its a manual just pop the clutch w/o the throttle

Apr 5, 2011 | 05:53 AM

dougbfresh

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Doesn't sound like run-on, sounds like a faulty ignition switch.

Apr 5, 2011 | 07:55 AM

dgrant3830

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From: Van Buren Arkansas

Wounded Warrior Escort '11

I agree...if its running normally then the ignition switch is suspect. Pull your codes too.

Apr 5, 2011 | 09:04 AM

dglad

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From: Beloit Wisconsin

There are no codes just once in a while after I turn the key off it will run for 1-2 seconds.

Apr 5, 2011 | 10:21 AM

ClockworkC5

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same thing happened in my old trans am and it was the spark plugs were leaking. i replaced them and the problem stopped

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Apr 5, 2011 | 11:39 AM

Cratecruncher

Instructor

Joined: Jun 2008

Posts: 233

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From: Austin Texas

I'm still not clear whether the OP's car is dieseling after the ignition switch is off or the car is idling normally after ignition switch is in off position.

Dieseling sounds like a very lumpy choking, coughing, pinging idle. It could never be described as a normal idle.

Apr 5, 2011 | 01:18 PM

#10

DeeGee

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From: Horncastle Lincolnshire, England

2023 C5 of the Year Finalist - Unmodified

I bet this in one of those that would be obvious if we could hear the "overrun"

Apr 5, 2011 | 01:48 PM

#11

Bill Curlee

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From: Anthony TX

CI 6,7,8,9,11 Vet

St. Jude Donor '08

Quote:

Originally Posted by dgrant3830

I agree...if its running normally then the ignition switch is suspect. Pull your codes too.

The only thing that initiates engine shut down is the ignition switch. Sounds like one of the contacts inside the switch is burnt and sticking closed.

Recommend ignition switch maintenance. Check out this link:

-C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html

Apr 5, 2011 | 04:08 PM

#12

Chicago1

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Joined: Mar 2008

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From: Rio Rancho NM

Did you get it tuned recently? So your diesling?

Apr 5, 2011 | 05:27 PM

#13

dglad

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From: Beloit Wisconsin

It's not really dieseling. Just after I turn the ignition off it will still run like I never shut it off for like 1-2 seconds.

Apr 5, 2011 | 05:31 PM

#14

dglad

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From: Beloit Wisconsin

I'm trying different gas station also to see if the gas may be the problem.

Apr 5, 2011 | 07:24 PM

#15

PEERPSI

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Joined: Aug 2010

Posts: 545

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From: Calgary Alberta

Engine run on is very unlikely in a fuel injected car. With carburetors it was possible because there was fuel in the bowl for the venturi effect to draw and the fuel pump was mechanical. If you had some source of ignition it could keep going. With fuel injection once the ignition is cut there is no more fuel even if a hot part was able to ignite it.

I agree with ignition switch servicing or replacement.

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