Need Help!
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Need Help!
Hopefully someone will chime in with some help...I have an 1982 F-100 4.9L I-6 3spd w/OD that seems to be misfiring while I'm driving. It just happened today on the way to work. So far I've changed the Cap/Rotor/Plugs/Wires/Fuel Filter/Fuel Pump/Air Filter/Starter/Starter Solenoid/Voltage Regulator/Battery.
When I first got the truck it was bucking and stalling, but after I changed the fuel filter it was okay. Since I just put 10,000km on the truck I replaced the fuel filter again and it has been fine. Could it be a bad ignition coil? I am not directly familiar with these older trucks so if anyone can offer some help that would be much appreciated.
When I first got the truck it was bucking and stalling, but after I changed the fuel filter it was okay. Since I just put 10,000km on the truck I replaced the fuel filter again and it has been fine. Could it be a bad ignition coil? I am not directly familiar with these older trucks so if anyone can offer some help that would be much appreciated.
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other ideas...
If I knew the coil specs I could just test it before I buy one so if anyone has a manual handy and could quote those numbers that would help a lot.
Does anybody have any other ideas as to what the problem could be? I can't see the timing being way off cause the truck idles fine, and will drive fine intermittently, it's only when you snap the throttle that the motor sputters really bad looking for power.
Does anybody have any other ideas as to what the problem could be? I can't see the timing being way off cause the truck idles fine, and will drive fine intermittently, it's only when you snap the throttle that the motor sputters really bad looking for power.
Cargo Master
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From: Too close to Houston
Originally Posted by Oldskool
it's only when you snap the throttle that the motor sputters really bad looking for power.
Also, check the vacuum advance hose running from the carburetor base to the distributor.
Last edited by Sport45; Oct 13, 2006 at 11:07 AM.
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still looking...
I've wanted to rebuild the carb for two weeks now but have not had any success finding a rebuild kit at any local parts places. However, it's been running decent up till now.
I was just outside looking at it and it's blowing black smoke out of the tail pipe intermittently.
I want to replace all the vacuum lines but I do not have a diagram for it. I looked at one on the Autozone website that seemed correct (1980 Model), but I do not know what some of the abreviations stand for.
I was just outside looking at it and it's blowing black smoke out of the tail pipe intermittently.
I want to replace all the vacuum lines but I do not have a diagram for it. I looked at one on the Autozone website that seemed correct (1980 Model), but I do not know what some of the abreviations stand for.
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I'll look at the vacuum lines you suggested and see if there are any problem areas there - thanks for the input - every little bit helps.
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Cargo Master
Joined: Apr 2003
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From: Too close to Houston
Here is a site that will tell you what all the abbreviations (that's an awful long word considering what it means) are for. Use the search function at the bottom left.
Is it hard to start after it sits a while? Unplug all the vacuum hoses from the carburator soon after you shut down. If gasoline starts dripping out of any of them there's a problem. That would most likely be a bad power valve.
Is it hard to start after it sits a while? Unplug all the vacuum hoses from the carburator soon after you shut down. If gasoline starts dripping out of any of them there's a problem. That would most likely be a bad power valve.
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Originally Posted by Sport45
Here is a site that will tell you what all the abbreviations (that's an awful long word considering what it means) are for. Use the search function at the bottom left.
Is it hard to start after it sits a while? Unplug all the vacuum hoses from the carburator soon after you shut down. If gasoline starts dripping out of any of them there's a problem. That would most likely be a bad power valve.
Is it hard to start after it sits a while? Unplug all the vacuum hoses from the carburator soon after you shut down. If gasoline starts dripping out of any of them there's a problem. That would most likely be a bad power valve.
It starts on the first turn of the key just fine - idles fine, but as soon as you give it some throttle it sputters and stumbles. Since I am at work I haven't tried unplugging any vacuum lines to look for fuel, just looking at it on break and lunch at this point. I aprpeciate all your help/info so far though it gives me more ground to cover in solving this problem.
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How did it run before you replaced all those parts ?
That's a lot of money you spend for maybe a minor problem.
The problem can be a few minor things.
Usually it is a carb problem.
Fuel filter, power valve, float level,Ignition module,wornout distributor,pick-up coil in distributor ,etc
Intermittent problems are the hardest to Trouble-shoot
BTW <> next thread, please put the Topic in the title.
It helps for other users searching & lets us know what the actual thread is about.
We are already here to help so asking "For Help" is redundancy
That's a lot of money you spend for maybe a minor problem.
The problem can be a few minor things.
Usually it is a carb problem.
Fuel filter, power valve, float level,Ignition module,wornout distributor,pick-up coil in distributor ,etc
Intermittent problems are the hardest to Trouble-shoot
BTW <> next thread, please put the Topic in the title.
It helps for other users searching & lets us know what the actual thread is about.
We are already here to help so asking "For Help" is redundancy
Last edited by Mil1ion; Oct 13, 2006 at 01:14 PM.
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My apologies about that - I'll remember for next time.
Well I replaced those parts because it sat for 2 years and the last tune-up was unknown. So i figured since I was given the truck free I would invest a little into it for peace of mind. After I replaced said parts it ran nicely up until today when it started to crap out on me. I ruled out the fuel filter since I just replaced that recently. I think I need to get my hands on a carb rebuild kit some new vacuum lines and go from there as you & Sport have said.
Well I replaced those parts because it sat for 2 years and the last tune-up was unknown. So i figured since I was given the truck free I would invest a little into it for peace of mind. After I replaced said parts it ran nicely up until today when it started to crap out on me. I ruled out the fuel filter since I just replaced that recently. I think I need to get my hands on a carb rebuild kit some new vacuum lines and go from there as you & Sport have said.