84 300 problems
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84 300 problems
Hello all. I am working on my father in laws 84 f-150. It doesn't get driven very much, maybe 500 miles in the last 3 years, but he does take pretty good care of it. The interior still looks brand new. Anyway, when he first asked me to look at it, the thing was running stupidly rich and was missing really bad. I put new cap, rotor, wires, and plugs in it and it helped a little. There were a couple of wires that weren't even sparking enough to light a timing light. It helped some but it didn't fix the problem so I kept looking.
I was feeling around the carb to see if there were any wires or vacuum lines disconnected and a cap came off just from me brushing it. As soon as the cap came off the engine revved way up and smoothed out. I was just getting to the cab to shut the truck off when it kicked down to a slower idle, although it still idles pretty fast. The cap was on a manifold just to the left of the carb, the same one the tube from the PCV valve runs to, and it points towards the front of the engine. The cap had oil in it and it is a little big for the tube it was on. The tube has a good bit of suction to it, and if you cover it with your finger, the engine dies. Any idea what is supposed to attach here? Or is it supposed to be plugged? Any other ideas on what might be wrong? I hope my description isn't too bad. I'll try and get a pic or two up tommorrow before I head to drill. Thanks in advance, Chris Barnes.
I was feeling around the carb to see if there were any wires or vacuum lines disconnected and a cap came off just from me brushing it. As soon as the cap came off the engine revved way up and smoothed out. I was just getting to the cab to shut the truck off when it kicked down to a slower idle, although it still idles pretty fast. The cap was on a manifold just to the left of the carb, the same one the tube from the PCV valve runs to, and it points towards the front of the engine. The cap had oil in it and it is a little big for the tube it was on. The tube has a good bit of suction to it, and if you cover it with your finger, the engine dies. Any idea what is supposed to attach here? Or is it supposed to be plugged? Any other ideas on what might be wrong? I hope my description isn't too bad. I'll try and get a pic or two up tommorrow before I head to drill. Thanks in advance, Chris Barnes.
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Joined: Jan 2001
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From: Virginia
Sounds like you are getting too much fuel. When you knocked the cap off, you created a large vacuum leak which let more air into the engine. The engine liked this, since it was getting too much fuel.
If you can get it running again, take the aircleaner off, and with a flashlight, look down the throat of the carb. While it's running, if you see liquid fuel dripping into the engine, then your float level in the carb is too high, and it's running over into the engine. This can be a simple as a piece of dirt blocking the needle from shutting inside the carb.
If you can get it running again, take the aircleaner off, and with a flashlight, look down the throat of the carb. While it's running, if you see liquid fuel dripping into the engine, then your float level in the carb is too high, and it's running over into the engine. This can be a simple as a piece of dirt blocking the needle from shutting inside the carb.
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