gas cap
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New User
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gas cap
i was just wondering if the gas cap could possibly be the cause of my truck shutting off. i have never heard of this before. my truck only shuts off when it gets warmed up, and when it stalls, it takes about five minutes or more before it will start back up.could it also be vapor lock? i replace the fuel pressure regulator and fuel filter, but it still shuts off. the motor has over 200,000 miles and still runs like a raped ape until its warmed up. any ideas would be greatly appreciated.
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I had an older van that did the same thing, turned out to be the ignition module, I replaced it with a cheap replacement that lasted about 2 days, I bought a motocraft replacement and never had any more trouble, I diagnosed it with a wet rag, as soon as it cooled off it started right up.
Mountain Pass
Joined: Dec 2008
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From: Scotts Valley, CA
If you're running a non-vented cap (which you should be, on a '90), and the vent line off the filler neck's capped, that's your problem. To check, try driving without the gas cap on - not with a full tank, of course. If the problem's gone, you need to re-connect the vent line.
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ok, i drove the truck for about an hour with no problems and about a 1/4 tank. could i just get a cap that is vented? the filler neck hose on it was replaced with just a regular rubber hose that does'nt have the vent tube.
Mountain Pass
Joined: Dec 2008
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From: Scotts Valley, CA
If you don't have smog checks where you live, that's definitely the cheapest alternative. Otherwise, you'll need to reattach the factory vent setup, which goes to the charcoal cannister under the hood.
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i will have to check that when i get off work, it started to do it again on my way to work today. it didnt stall out, but the rpm's started to jump around. i hammered the gas and it quit though.
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From: North Reading Mass
Some of the early EFI 300s did have a vapor lock issue. The heat from the exhaust manifolds would cause vapor lock. Ford first used a small fan to cool the area then they installed a heat shield and increased the fuel pressure.
As stated by others a bad iignition module will often fail with heat.
regards
rikard
As stated by others a bad iignition module will often fail with heat.
regards
rikard
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
If your truck has the ignition module mounted on the dizzy, this is the worst piece of CRAP ever installed on any Ford vehicle!
(EDIT: I just looked the puppy up. This IS the same terd your truck has).
E43Z12A297A .. Ignition Module (Motorcraft DY425)
Fits 1990/91 4.9L (300); 5.0L (302); 5.8L (351W): E150/350; F150/350; U150 (Bronco) / Many other I-4, I-6, V6, V8 Passenger Cars/Trucks back to 1983.
After years of arguing, Ford was forced by the NHTSA to recall FIVE MILLION vehicles several years ago to replace them all.
I passed out over the back parts counter...an average of three of these fracatta modules a day...for over 14 years here in LA LA Land.
That's one partsguy at one dealership. Just imagine how many of these modules were sold during the same time frame at the other 5,000 dealers.
The three step scenario of a failing ignition module:
1) Module overheats, engine dies. Module cools down, engine restarts almost immediately.
2) Module overheats, engine dies. Module cools down, engine restarts in an hour or so.
3) Sooner or later, usually sooner, the module overheats, burns out. Now the engine will not restart!
(EDIT: I just looked the puppy up. This IS the same terd your truck has).
E43Z12A297A .. Ignition Module (Motorcraft DY425)
Fits 1990/91 4.9L (300); 5.0L (302); 5.8L (351W): E150/350; F150/350; U150 (Bronco) / Many other I-4, I-6, V6, V8 Passenger Cars/Trucks back to 1983.
After years of arguing, Ford was forced by the NHTSA to recall FIVE MILLION vehicles several years ago to replace them all.
I passed out over the back parts counter...an average of three of these fracatta modules a day...for over 14 years here in LA LA Land.
That's one partsguy at one dealership. Just imagine how many of these modules were sold during the same time frame at the other 5,000 dealers.
The three step scenario of a failing ignition module:
1) Module overheats, engine dies. Module cools down, engine restarts almost immediately.
2) Module overheats, engine dies. Module cools down, engine restarts in an hour or so.
3) Sooner or later, usually sooner, the module overheats, burns out. Now the engine will not restart!
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so your saying i need a new ignition module? and what is a dizzy? i noticed the other day that there is no gasket between the throttle body and intake. would explane why it idles high. but i still dont know why its dieing . if it is the ignition module, where is it located?
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Dizzy = slang for distributor where the little darlin' is located.
I'm not saying you need an new ignition module, all I'm saying is the one on your truck is a major POS (Piece Of...you know what), notorious for failing.
Since your truck is cutting out after it warms up (and the module is prolly overheating in the process), replacing it...is a good idea.
Prolly 10 million of these exact same modules have been replaced since 1983.
I'm not saying you need an new ignition module, all I'm saying is the one on your truck is a major POS (Piece Of...you know what), notorious for failing.
Since your truck is cutting out after it warms up (and the module is prolly overheating in the process), replacing it...is a good idea.
Prolly 10 million of these exact same modules have been replaced since 1983.
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Before I did anything, I would check for spark at a spark plug when engine is hot and won't start, this way you would rule out fuel problems if you aren't getting spark, then concentrate on electrical problems.
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