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351c after run questions
#1
On a 1973 mustang, 351c 2v, after the key is turned off the engine has after run. What causes this? Is it a major or minor repair?
Thanks
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#2
There should be a solenoid on the carb that is energized when the key is one that pushes the throttle open slightly. Idle should be set with this energized. When you turn off the key if backs off closing the throttle completely to prevent dieseling. Is that there and working properly?

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
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#3
Define "After run" if you will.

Pending that definition:

If it's where the car seem to run for a bit longer then dies, we use to call that dieseling. It could be caused by timing, or fuel issue.

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
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#4
Dieseling can also be caused by the timing being way off, IIRC.

Let me check your shorts!
http://midlifeharness.com

[Image: Flamicon2.jpg]


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#5
Was looking at a 1973 Mustang and the current owner told me that he shuts is off in drive to prevent this from happening. I just wanted to make sure it wasnt a valve train issue. He did stat that the car was idling high??
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#6
More than likely a carb issue or possibly timing to far advanced. Especially based on the fact that he indicated the idle is high. Either way prob a simple fix. If you end up getting it and need a new 2bbl carb let me know. Just pulled mine. it is a motorcraft stamped carb that was remanufactured about 2 years ago by Uremco. It worked great just doing some upgrades and no longer need.

https://www.summitracing.com/parts/urm-7...el/mustang

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
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#7
Could be a leaking intake gasket sucking air. Had old f150 that I had to shut off in drive or it would diesel like hell.

Kevin

1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

[Image: 28ivsix.png]




                                                                                             
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#8
73 Pony's post, +1. Chuck
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