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dieseling problem

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dieseling problem

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Old

Dec 6, 2003 | 06:01 PM

#1

chris69

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dieseling problem

my 1978 f-150, 400 engine diesels when i shut it off. my timing is not off. what is wrong

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Old

Dec 6, 2003 | 06:54 PM

#2

79 250 lariat 4x4

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try running higher octane fuel

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Old

Dec 6, 2003 | 07:46 PM

#3

Torque1st

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Your carb idle is set too high. You can find out about carb settings in the Fuel systems forum.

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Old

Dec 6, 2003 | 08:39 PM

#4

68FordCA

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Hehe..Torque beat me to it. Idle is a bit too high, you will have to tweak it a bit to find the "sweet" spot, where it will idle fine but not diesel when shut down.

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Old

Dec 6, 2003 | 08:55 PM

#5

Torque1st

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A good tune up will make it easier to find that sweet spot. An old engine that is down on compression and dying will be hard to get to run correctly.

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Old

Dec 6, 2003 | 10:58 PM

#6

74 F100 351m

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From: Okla.

I would say it might be a streched timing chain.

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Old

Dec 7, 2003 | 04:52 AM

#7

willd

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Joined: Oct 2002

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Carbon deposits on exhaust valve or combustion chamber will cause it when you combine too much idle air and no load on the engine ie. with an auto. Try shutting it off in gear or letting the clutch out in gear with the brakes applied. Sometimes works for auto's too.

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