help on 91 ford dying
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Joined: Sep 2007
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help on 91 ford dying
I have a 1991 F-250 with well over 100,000 miles. The truck will not start after sitting over an hour with adding some starter fluid. (It feels like the diesel is leaking back). Also, when you shift gears, the truck's rpms will decrease to a degree that the truck will die. I can drive the truck as is, but I wouldn't want anyone else chancing the risk. I have had several mechanics look at as well, and no one can seem to find the problem. Do you have any suggestions to try. Thanks.
Lead Driver
Joined: Nov 2003
Posts: 6,900
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From: Campbell River, B.C.
These are among the simplest diesels in recent history, and yet, its amazing how hard it can be to find a machanic that cares enough to know how they work. Weclome to the IDI diesel forum.
Ok, If I read correctly, you have two sypmtoms. the first is that the truck does not like to restart after a one hour wait from a hot shutdown.
And the second, is the truck tends to stall when you let off the throttle.
The second sounds a lot like an injector pump problem, mine did this as well a little while ago. The fix for me was to run some ATF in the tank to clean and lubricate the injection system. I would fill the fuel filter with 50% ATF as well to get a better affect sooner.
I feel that the two may be related, so try the ATF first.
An air leak could also be playing a role, but usually (but not always) an air leak will cause cold start issues as well as hot start. The classic symptom, is an easy start, followed by a stall after 10-30 seconds.
Ok, If I read correctly, you have two sypmtoms. the first is that the truck does not like to restart after a one hour wait from a hot shutdown.
And the second, is the truck tends to stall when you let off the throttle.
The second sounds a lot like an injector pump problem, mine did this as well a little while ago. The fix for me was to run some ATF in the tank to clean and lubricate the injection system. I would fill the fuel filter with 50% ATF as well to get a better affect sooner.
I feel that the two may be related, so try the ATF first.
An air leak could also be playing a role, but usually (but not always) an air leak will cause cold start issues as well as hot start. The classic symptom, is an easy start, followed by a stall after 10-30 seconds.
New User
Joined: Jul 2007
Posts: 16
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my 6.9 85 F350 was having the hot start problem and running rough I ran dieselkleen in it and then had to add an electric pump I think the cam lobe that runs the lift pump is worn down to where the mechanical pump isnt really putting out. just running the dieselkleen helped an awful lot
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
I would second the air intrusion/drain back in the fuel system you suspect........
Visit....... http://www.intellidog.com/dieselmann/idi.htm read about the clear hose and the fuel filter leak points.....
There is a Tech service bullitin (TSB) re stalling when clutch is pushed in.......or coming to a stop. Basically it refers to a rusted/crud filled IP and gives instructions how to check..... it does suggest use of a good fuel additive ie Stanadyne/Power service etc...... if repair is possible. Click on my name and email me ask for: IP TSB
Visit....... http://www.intellidog.com/dieselmann/idi.htm read about the clear hose and the fuel filter leak points.....
There is a Tech service bullitin (TSB) re stalling when clutch is pushed in.......or coming to a stop. Basically it refers to a rusted/crud filled IP and gives instructions how to check..... it does suggest use of a good fuel additive ie Stanadyne/Power service etc...... if repair is possible. Click on my name and email me ask for: IP TSB
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