Ford Truck Enthusiasts Forums
Older, Classic & Antique Trucks
1973 - 1979 F-100 & Larger F-Series Trucks
dieseling problem

1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

Sponsored by:

dieseling problem

Reply Subscribe

Search this Thread

Old

Dec 6, 2003 | 06:01 PM

#1

chris69

Thread Starter

|

New User

Joined: Sep 2003

Posts: 18

Likes: 0

dieseling problem

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

Reply

Old

Dec 6, 2003 | 06:54 PM

#2

79 250 lariat 4x4

Junior User

Joined: Sep 2003

Posts: 66

Likes: 0

try running higher octane fuel

Reply

Old

Dec 6, 2003 | 07:46 PM

#3

Torque1st

Posting Legend

Joined: Sep 2001

Posts: 30,255

Likes: 37

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

Reply

Old

Dec 6, 2003 | 08:39 PM

#4

68FordCA

Junior User

Joined: Nov 2003

Posts: 61

Likes: 0

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.

Reply

Old

Dec 6, 2003 | 08:55 PM

#5

Torque1st

Posting Legend

Joined: Sep 2001

Posts: 30,255

Likes: 37

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.

Reply

Old

Dec 6, 2003 | 10:58 PM

#6

74 F100 351m

Elder User

Joined: Nov 2003

Posts: 705

Likes: 0

From: Okla.

I would say it might be a streched timing chain.

Reply

Old

Dec 7, 2003 | 04:52 AM

#7

willd

Elder User

Joined: Oct 2002

Posts: 743

Likes: 1

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.

Reply

Reply Subscribe

Reply Share

First
Prev
1 / 1
Next
Last

All times are GMT -5. The time now is 05:24 AM.