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03-07-2017, 02:22 PM
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#1 |
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Registered User
Join Date: Apr 2014
Location: haines city
Posts: 56
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Truck won't turn off
Hey guys recently I have been having issues with my 1970k10 not shutting off whenever turn the key to the off position. It only does when the trucks been running for 10+ minutes and it only started doing a few weeks ago and I haven't done anything to the ignition or distributor. Does anyone have any ideas? Thanks
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03-07-2017, 02:44 PM
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#2 |
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Senior Member
 Join Date: Jul 2015
Location: Warrenton VA
Posts: 1,008
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Re: Truck won't turn off
How do you get it to shut off, if you shut it off in gear if its an auto will it shut off? Could of developed a vacuum leak and its "dieseling" IE running off the heat from the exhaust valve. When it doesn't turn off, does it run smooth or kinda rougher than when the key is on?
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71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350 |
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03-07-2017, 03:51 PM
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#3 |
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Registered User
Join Date: Apr 2013
Location: South Westerlo, New York
Posts: 1,325
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Re: Truck won't turn off
bring your idle down, sounds like you're describing dieseling..
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
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03-07-2017, 04:22 PM
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#4 |
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Go Pack Go!
Join Date: Nov 2005
Location: Green Bay
Posts: 2,669
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Re: Truck won't turn off
See how good our trucks run? They never want to shut-off
 If it's not deiseling, your ignition switch may need replaced. |
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03-07-2017, 04:48 PM
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#5 |
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Registered User
Join Date: Sep 2016
Location: Vancouver BC
Posts: 784
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Re: Truck won't turn off
Did these trucks ever have the "anti-dieseling" switch on the throttle linkage?
Another thought: could be deposits of carbon in the combustion chamber and on the valve heads. They get hot, then they glow, and if there's a bit too much idle throttle, they detonate the mixture and the engine keeps firing, usually really unevenly.
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Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible |
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03-07-2017, 05:31 PM
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#6 |
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Registered User
Join Date: Apr 2014
Location: haines city
Posts: 56
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Re: Truck won't turn off
It's a manual transmission and usually what I have to do it get out of the truck and undo the positive battery cable but every once in a while if I turn the lights on it will shut off when the key is off and it's still running and it runs the same whether the key is in the on or off position..it's got me pretty confused
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03-07-2017, 05:32 PM
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#7 | |
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Registered User
Join Date: Apr 2014
Location: haines city
Posts: 56
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Quote:
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03-07-2017, 05:40 PM
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#8 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,512
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Re: Truck won't turn off
Easy to check if it's dieseling or running.
If you can drive it normally with the key off then it's not diesiling. |
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03-07-2017, 05:47 PM
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#9 | |
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Registered User
Join Date: Apr 2014
Location: haines city
Posts: 56
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Quote:
Posted via Mobile Device Posted via Mobile Device |
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03-07-2017, 08:30 PM
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#10 | |
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Registered User
Join Date: Apr 2013
Location: South Westerlo, New York
Posts: 1,325
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Re: Truck won't turn off
Quote:
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
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03-07-2017, 08:52 PM
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#11 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Truck won't turn off
Short from main lug to points bypass wire at starter?
HEI plugged into wrong spot on fusebox (I know you said no changes, but something changed somewhere)?
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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03-07-2017, 09:15 PM
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#12 |
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Senior Member
Join Date: Jan 2016
Location: massachusetts
Posts: 326
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Re: Truck won't turn off
Disconnect the alternator wires-start engine see if it shuts off! Maybe open diod in alternator!
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03-10-2017, 01:13 AM
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#13 |
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Registered User
Join Date: Dec 2016
Location: Brentwood, North California
Posts: 80
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Re: Truck won't turn off
Mine did the same thing once and it was tbe alternator back feeding power. Try removing the alternator plug and if it shuts off you need a new alternator. Just buy a 1 wire alternator cleaner anx easier
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03-10-2017, 02:26 AM
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#14 | |
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Registered User
Join Date: Dec 2009
Location: El Dorado Ca
Posts: 3,374
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Re: Truck won't turn off
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03-13-2017, 09:35 PM
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#15 |
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Senior Member
Join Date: Jan 2016
Location: massachusetts
Posts: 326
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Re: Truck won't turn off
hunter1123--Have YOU figured out why your engine wont shut off! Let us know how you are doing---might help someone else! GOOD LUCK
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04-26-2017, 08:49 PM
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#16 | |
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Senior Member
Join Date: Jan 2016
Location: massachusetts
Posts: 326
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Re: Truck won't turn off
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04-26-2017, 09:41 PM
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#17 |
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Registered User
Join Date: Apr 2014
Location: haines city
Posts: 56
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Re: Truck won't turn off
Yes I have the alternator was not wired correctly since there is not an idiot light on the truck the alternator would back feed power into the ignition/distributor keeping the truck running, thankfully a $15 alternator harness with a in line diode solved he problem, thank you for following up!
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04-26-2017, 10:53 PM
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#18 |
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Registered User
Join Date: Dec 2009
Location: El Dorado Ca
Posts: 3,374
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Re: Truck won't turn off
thanks for the update
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