Had to leave the jeep sitting for two years while I was out of country. It ran well when I left it in storage, and I have spent a year now since being back trying to get it running again!
Latest problem is persistent popping through the carb. This happened last summer, then I somehow fixed it, and now it's back. When it happened before I changed out the plugs, wires, cap, and rotor. Also siphoned out and replaced the gas, which had gone sour, and new fuel filters and fuel pump. After that it ran but not well - wouldn't go over 40 and kept wanting to bog down and die (maybe varnish left in the fuel tank was poisoning the new gas?).
Rebuilt the carb and found one of the bowls dry and some gummy residue from the gas. Put it back on and car ran better - up to 55 mph! - but still bogged down.
Bogging down is worse now and backfiring through carb has returned. One theory I had is that when the car bogs down, the unburnt fuel leaves carbon buildup everywhere and this is causing the spark plugs to act funny and detonate at the wrong time, causing backfire. I took the plugs out and sure enough they are all black. Sprayed them with carb cleaner but it couldn't get all the black off.
Tried running seafoam to clean everything out and the engine actually ran GREAT - WHILE THE SEAFOAM WAS POURING OUT. Then when the seafoam was gone, the backfiring came back!
At a loss right now...
Latest problem is persistent popping through the carb. This happened last summer, then I somehow fixed it, and now it's back. When it happened before I changed out the plugs, wires, cap, and rotor. Also siphoned out and replaced the gas, which had gone sour, and new fuel filters and fuel pump. After that it ran but not well - wouldn't go over 40 and kept wanting to bog down and die (maybe varnish left in the fuel tank was poisoning the new gas?).
Rebuilt the carb and found one of the bowls dry and some gummy residue from the gas. Put it back on and car ran better - up to 55 mph! - but still bogged down.
Bogging down is worse now and backfiring through carb has returned. One theory I had is that when the car bogs down, the unburnt fuel leaves carbon buildup everywhere and this is causing the spark plugs to act funny and detonate at the wrong time, causing backfire. I took the plugs out and sure enough they are all black. Sprayed them with carb cleaner but it couldn't get all the black off.
Tried running seafoam to clean everything out and the engine actually ran GREAT - WHILE THE SEAFOAM WAS POURING OUT. Then when the seafoam was gone, the backfiring came back!
At a loss right now...
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