motor wants to stay on - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1986brownjl · 08-25-2013, 09:45 PM

I have a 86 chevy k10 when I turn the truck off the motor acts like it wants to stay on, like it will turn over a few times after I turn the ignition off. is that the carb? it has a stock quadrajet on it and what size cfm is it to? thanks for the help.

SamsAutoParts73-87 · 08-25-2013, 10:00 PM

I'm sure someone that has a lot more knowledge then I will jump in...but I would check the "anti-dieseling" solenoid on the carb if the truck has one, or the timing may be off slightly.

-Sam

*cleansquare* · 08-25-2013, 10:03 PM

Its called dieseling...what rpm does you truck idle at? Could be too high
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SamsAutoParts73-87 · 08-25-2013, 10:08 PM

Quote:

Originally Posted by cleansquare

Its called dieseling...what rpm does you truck idle at? Could be too high
Posted via Mobile Device

Also worth in investigating, your emissions label on the radiator support will tell you what RPM it should idle at, it should give one for manual trans and one for auto.

-Sam

V10farmboysdream · 08-25-2013, 10:15 PM

I'd start with timing. To far advanced will cause a diesel. Crappy gas and high compression will do that too and comes with a spark knock
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geezer#99 · 08-25-2013, 10:45 PM

Turn your idle down. If it idles too slow then just hook your vac advance to manifold vacuum to speed it back up.

08-25-2013, 09:45 PM	#1
1986brownjl Registered User Join Date: Sep 2012 Location: Neeses SC Posts: 66	motor wants to stay on I have a 86 chevy k10 when I turn the truck off the motor acts like it wants to stay on, like it will turn over a few times after I turn the ignition off. is that the carb? it has a stock quadrajet on it and what size cfm is it to? thanks for the help.

08-25-2013, 10:00 PM	#2
SamsAutoParts73-87 Registered User Join Date: Feb 2013 Location: Rome PA Posts: 340	Re: motor wants to stay on I'm sure someone that has a lot more knowledge then I will jump in...but I would check the "anti-dieseling" solenoid on the carb if the truck has one, or the timing may be off slightly. -Sam __________________ 1987 Chevy R30 CC 454/4spd Work Truck 1979 Chevy K10 SWB 350/4spd/NP205, 1979 Chevy C10 LWB 350/TH350 Project 1981 Chevy K30 350/Th400/NP205 1986 Chevy K30 CUCV 6.2L/TH400/NP208

08-25-2013, 10:03 PM	#3
cleansquare Account Suspended Join Date: Mar 2013 Location: lumberton tx Posts: 575	Re: motor wants to stay on Its called dieseling...what rpm does you truck idle at? Could be too high Posted via Mobile Device

08-25-2013, 10:15 PM	#5
V10farmboysdream Registered User Join Date: Feb 2013 Location: Markle indiana Posts: 42	Re: motor wants to stay on I'd start with timing. To far advanced will cause a diesel. Crappy gas and high compression will do that too and comes with a spark knock Posted via Mobile Device

08-25-2013, 10:45 PM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,732	Re: motor wants to stay on Turn your idle down. If it idles too slow then just hook your vac advance to manifold vacuum to speed it back up.



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