Cutting off in the rain...
Thread Starter
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Junior User
Joined: Nov 2003
Posts: 82
Likes: 0
From: VA, USA
Cutting off in the rain...
All was well with the world. I got the 81 F150 300 running, and cooling properly. That is, until I left for work in the rain. Once the engine got good and warmed up and the oil pressure went down, whenever I pushed in the clutch, it would idle down until it cut off. Had to keep my foot on the gas to get it back home. Now, one thing I was thinking, probably not it but it came to mind, my carb (Carter YFA) no longer has the bracket that the air filter housing screws into and the screw hole is wide open. I was thinking water was dripping down there into the carb. This seems unlikely, but like I said, it was the best I've come up with so far.
Any other ideas?
Thanks!
Any other ideas?
Thanks!
New User
Joined: Jul 2004
Posts: 8
Likes: 0
Are you sure it's related to the rain and not the warm engine? Check out the vacuum system and all the carb adjustments. There's a vacuum valve on the thermostat housing on my '81 300 (in an E100 van but very similar), which, to my understanding, is closed when the engine is cold, disabling the emissions/vacuum system, and open when hot, so that all that stuff is enabled. Could cause a warm running problem.
Water leaking in a screw hole should not be a problem. That hole should not be open to the inside of the carb.
Water leaking in a screw hole should not be a problem. That hole should not be open to the inside of the carb.
Thread Starter
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Junior User
Joined: Nov 2003
Posts: 82
Likes: 0
From: VA, USA
Its only related to the rain. Never cuts off in dry weather. An the only time it did do this, it was raining pretty hard.
I have already changed plugs, wires, cap, and rotor. But not the distributor itself.
Thanks!
I have already changed plugs, wires, cap, and rotor. But not the distributor itself.
Thanks!
New User
Joined: Jul 2004
Posts: 8
Likes: 0
What about the Duraspark control box? Mounted on driver's inner fender on mine.
Definitely sounds like ignition to me.
Definitely sounds like ignition to me.
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Fleet Mechanic
Joined: Aug 2002
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From: Swansea SC
cutting off
pop had a 76 e van to do this ---he always used a hair dryer to get it started too cheap to buy a distributorcap-TR 
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Posting Guru
Joined: May 2004
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From: Prince George, B.C.
Does it seem to be running smooth as it dies, no misses or shuddering? If it was the cap or dist wires it would develop a heck of a miss too. Them stupid '70s dodge pickups were bad for that, they had 2 spots on the hood where water collected then if you opened it it would dump all over the distributor cap and the truck would backfire and miss like crazy. Try sealing up the Dist cap and see if it helps, as for the oil pressure I have no idea how that would play a part in the quitting.
Thread Starter
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Junior User
Joined: Nov 2003
Posts: 82
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From: VA, USA
It will run really rough as it dies, I was thinking the oil pressure was related to the engine getting ready to cut off. At the time this happened, I was still using the idiot light, but I have since installed the mechanical gauge. I haven't driven the truck in the rain since then, and I haven't driven it at all in about a month. My new tires should be going on Wednesday. And it should be raining that dya according to the weather, so I'll try it again. Another thing, it only happened once the truck was warmed up to normal temp.
Is there anyway to test the duraspark box? Can I just get it running and warmed up and spray water on it? I would rather not fry it though.
Is there anyway to test the duraspark box? Can I just get it running and warmed up and spray water on it? I would rather not fry it though.
Posting Guru
Joined: May 2004
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From: Prince George, B.C.
Te duraspark box should be sealed, you could try spraying it but I have no idea if it will work. you have an oil pressure guage now? Is the guage high when the engine is cold then drops when it is warm? If so it could mean worn bearings but it was probly dropping more as the engine slowed down to die, so unless it is injected I doubt it has anything to do with the engine quitting.