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#1 |
Registered User
Join Date: Apr 2017
Location: GA
Posts: 151
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1970 c10 trouble on shut off
Hey guys, when I drive my truck for a while and then proceed to shut it off, it struggles a bit to do so, runs and chugs for a few cycles before finally shutting down. Any ideas as to what this could be?
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#2 |
Registered User
Join Date: Apr 2011
Location: formerly NY currentlyNC
Posts: 390
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Re: 1970 c10 trouble on shut off
generally after-run is caused by combustion chamber temperatures that are so high they ignite the fuel mixture without the need of a spark...look for wrong heat range plugs, heavy carbon deposits, incorrect timing, idle speed way too high,mixture too lean,general overheating...could even be heads milled too far for the gas you're using....try premium...there were anti-diesel solenoids available that closed the throttle all he way when the power was turned off but your model shouldnt have come with (or needed) one but it could be retrofitted
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1970 short step c10 leaf spring 454 |
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#3 | |
Registered User
Join Date: Apr 2017
Location: GA
Posts: 151
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Re: 1970 c10 trouble on shut off
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#4 |
Registered User
Join Date: Jan 2017
Location: Larkspur, Colorado
Posts: 916
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Re: 1970 c10 trouble on shut off
As Volksworld stated Throttle blade opening is key to curing this problem. You want the throttle blades as closed as possible when you shut the truck off. To cure this problem do the following : first make sure the return spring is strong enough to return the throttle blades to the idle stop screw every time you release the throttle from your foot. Second, make sure the ignition timing is set properly and not retarded. If the ignition timing is retarded it will require more throttle opening to achieve the correct idle speed. Third, adjust the idle mixture screws properly in the carburetor base. Doing all of the above then set your idle speed with the throttle blade adjusting screw. Covering all these bases will allow the throttle blades to be closed as much as possible upon shut off and should cure the problem.
Steve weim55 Colorado |
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#5 | |
Registered User
Join Date: Apr 2017
Location: GA
Posts: 151
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Re: 1970 c10 trouble on shut off
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