I am having a problem with my '82 CJ8 with the 151 Iron Duke 4 cylinder and a T-4 transmission. Back story:
Bought the '82 CJ8 from the original owner this past Thanksgiving. It hasn't been run in over 10 years but I got it running a few weeks ago. Changed all fluids, plugs, plug wires, cap, rotor, fuel filter, and rebuilt the carburetor (stock Rochester 2 barrel Varajet). At the initial start up, the Jeep would idle good and rev a little rough, but after a few seconds it would smooth out and idle/rev great! The rough reving I am referring to sounds like a carbureted engine warming up.
Anyways, after checking the brakes, fixing a flat tire, and changing the ignition lock cylinder I had the Scrambler running and stopping great! I have been driving it around our land for the past couple of weeks and it has done great. Last weekend (Friday) I decided to take it up to the lake (approx. 35 miles). The CJ8 cruised down the road great at 60 mph until about 25 miles into the trip. At this point the Jeep would periodically miss out, but not enough to affect the way it drove. This problem began to worsen until it got to the point the Jeep died. I was able to start the Jeep a few more times by pumping the gas pedal many times but it got to the point it wouldn't start at all. Luckily I made it to less than a mile from the lake so I was able to get a tow. I got a ride home for work Saturday and brought my Grand Cherokee back up with my tow bar to get the jeep back home.
My initial thought was the problem that caused all of this was a bad fuel pump. I got a new fuel pump and installed it today thinking that was the problem. After installing the new fuel pump, the Jeep fired right up although it would still run slightly rough if I raised the RPM's above idle for a few seconds but it smoothed out like it normally did. I left in the Jeep to go down our driveway for a test drive and after about 100 yards it died. I was able to get it going again but if I would try to let out on the clutch to go, the Jeep would die. If I would not put it in gear, it would start, idle and run good but if I tried to move the Jeep under its own power it would die. I was able to put the Jeep in 4 low to get it back to the shop.
its like the Jeep will start and run fine until I begin the drive it. It will make it about 100 yards and die. If the Jeep is sitting it will still rev up fairly well, it will even start easily the first time when it hasn't been run for a little while. But if it dies while trying to drive it, the starting gets much tougher; I have to really pump the gas pedal. Does anyone have any ideas what would cause this? I have though maybe something in the carburetor but the problem began a couple weeks after it was rebuilt and I have driven it quite a bit since then. Would a clogged pickup screen in the fuel tank cause this? I would think a clogged screen would not let it idle even. Any help is appreicated!