Went for a little wheeling tonight... BIG mud pit, up to almost the top of the hood. The engine stalled coming out of the mud, so I tried to start it, and it wouldnt. I let it sit for maybe 5 minutes, then tried again. It was gurgling really bad trying to start, and finally did. Once it was started it felt like I had no control over the throttle at all. I let it idle for a couple minutes then revved it up. I let my foot off the gas, and it kept revving. So I killed the ignition, and started it back up again, idled fine. Revved it up, did the same thing. Killed it. So I let it idle for a few more minutes and had my friend pull me out to the road. Stuck it back in 2wd, unlocked the hubs, the usual, and went to drive home. It was fine for maybe a 1/4 mile, then it started going faster and faster. Killed it, started it and kept going. Finally dropped of my friend, and got home, but it did it like 10 times on the way home. It's not every time i accelerate, just sometimes.
256 I6 engine
Holley 4-bbl carb w/ vacuum secondaries, on an Offenhauser intake manifold
Things I've already checked:
Air cleaner, the element is pretty well smashed, and dirty, but seems otherwise fine.
Throttle cable is NOT sticking. Even if i sit there and pull the throttle arm with my hand with the truck idling, it'll still do it every now and then.
Oh, and when I pulled the air filter off, I looked in the carb, and there's real fine dirt every where, but it doesnt seem like its being sucked in.
Also, when I got the Jeep, there was no vacuum line hooked to the carb, and about a week ago I spliced the vacuum line and hooked it up. It still seems like the secondaries are not kicking in, because they are dry.
Please, if you can offer me ANY advice it would be greatly appreciated!!
Are you saying that you started the engine and with the hood opened you rev the engine at the carb linkage and even if you force it closed it still revs up faster? Or is this only happening when you operate the throttle from inside the cab? If it's the latter, then try working the gas with the air cleaner off and at the linkage under the hood. Rev it up and tell us what happens. If you got a bunch of mud under the hood you may have it all over the linkage or the return springs.
2004 Rubicon, 6" lift, 35s, winch, hard top, full doors, bumpers, tire carrier and rock sliders.
Ok, this morning before work, I replaced the air filter, and sprayed some carb cleaner in the carb. Everything seems to be back to normal now. Just one other problem, which is the idle. It seems to be higher than usual, but I'll just adjust that when i get time.