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By thrush544 - 15 Years Ago
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My 292 was running fine. Then when i took it on longer trips i noticed she started running badly, had to keep the accelerator down to keep her running. Then I bought gas and anext time i drove her she started backfiring through the exhaust and carb. As I went she got worse. I figured it must be bad gas so i bought some dry gas/cleaner and next time she ran good, but didn't go far. Then next time i drove her she was really bad almost didn't make it home. So I fiddled with the dist cap put some fresh gas in, and she started rough but ok went to leave and it got worse and worse. then it started running good. Then on the way home it started up good,ran good, got half way home and she started backfiring again. Almost didn't make it home. I swaped out the coil, no change. I replaced both gas filters, no change. I am thinking maybe the accelerator pump on the carb, the fuel pump or the condenser. Maybe as simple as the coil wire, but it looks fairly new. I bought the truck out of Idaho last fall. Any help would be greatly appreciated.
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By 55Birdman - 15 Years Ago
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coil wire, condenser,dirty carb, bad accelerator pump.
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By PF Arcand - 15 Years Ago
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From your description, the problem is intermittent, so need to look at things from that prospective. A good place to start might be taking the valve covers off. Is the top end oiling good? Has the engine sat for a long period? Could be a sticking valve or valve train problem...
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By crenwelge - 15 Years Ago
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In addition to the above mentioned things, it could simply be points too close and are sticking or if a distributor has sat a long time, the advance can get rusty. They can advance and then not return. However, my first guess would be stale gas with valves sticking.
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By chiggerfarmer - 15 Years Ago
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If you don't find the problem from the very good suggestions that these fellows have given, one more place to check would be the distributor primary wire. Sometimes the wire will break inside the insulation from having moved back and forth so many times as the points plate advances.
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By Ted - 15 Years Ago
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I’ll add that from your description this sounds like it’s ignition system related but the fuel system is still on the list of possibilities. Is the ignition electronic or points? If electronic, what brand? If points, have you checked or replaced the condenser? You’ve already replaced the coil so I’ll assume the replacement is a good one. Double check all wiring inside and outside the distributor. Does the problem show up more as the fuel tank level gets lower? If so, then an internal crack in the fuel line within the gas tank itself is a possibility. Is the vent for the gas tank clear of obstructions? Something as simple as a mud dauber blocking the vent line can be tough to trouble shoot if not looking at it and may not show up on short trips.
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By 57f100 - 15 Years Ago
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hey man i had that same problem 2 weeks ago i drive my 57 f100 with a 272 y-block in it as my daily driver one day she started misfiring real bad changed out spark plug wires cap rotor and still did it so i pulled the points out put some new points gaped them and perfect hasent dont it since u might wanna take a look at your points
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By thrush544 - 15 Years Ago
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Thanks, all of you. I will give it a try and keep you all up to date. I do have a new set of points, cap and condenser for a 62 390, I'll try to cross check it to see if they are interchangeable by chance. Thanks Again
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By 314 - 15 Years Ago
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its all the same.
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By paul2748 - 15 Years Ago
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Do you still have the old gas filters? Cut them apart and see if there is any crap in them. Maybe some dirt/crud in the gas tank that keeps getting picked up and gets through the filter.
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By jonnireb - 15 Years Ago
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Thrush Check fuel line for partial obstruction,sometimes something can be in the fuel line and allow some fuel past, but not enough. Also the starter relay can rarely develop an intermittent short allowing current to be bled from the distributor with all sorts of dire consequences to the engines performance.
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By Pete 55Tbird - 15 Years Ago
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Twice I had similar symptons that were random in nature and very hard to track down. First was a bad connection on the wire from the points to the plate in the distributor and the second was an air leak in a rubber fuel line between the tank and the fuel pump. Tell us what you find that caused your problem. Pete
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By thrush544 - 15 Years Ago
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 God willing I will be able to work on her tomorrow night. I'll let you know. I am overwhelmed with all your help. Thanks everyone. I originally was going to drop in a 390 or a 460, however between it "belonging" and something about the 292 Y Block heritage, it will be staying. Although soon down the road there will be a rebuilding and I can't rebuild it without hotrodding her. Thanks Again, Ed
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By thrush544 - 15 Years Ago
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Ok guys, I'm feeling a little silly. I did a new cap, rotor, points and condenser on the distributer tonight and she is running ok. Seems to actually have a little less power though. Why I feel silly is i should have suspected that right off the bat.  There was some wear to the counter clock side (looking into the cap) of the contacts in the distributer cap. I didn't pick that up the first time I looked at it. Could the vacuum advance possibly be off to cause that. The points were not toast but also showed wear. So did the rotor but again, I have seen worse. Actually I didn't check the old cap for hairline cracks (will do after dinner). Had a demo car do that to me the day of the derby... years ago.
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By thrush544 - 15 Years Ago
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Now that she is running better, I also have determined the accelerator pump is bad! So it appears to have been a combination of at least two issues.
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