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post #1 of (permalink) Old 08-31-2001, 01:46 PM
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Get bad idle after offroading

W/ my Weber carb and HEI ignition, my idle is almost always good. But when I go into 4-low for awhile and off road, my idle goes to crap within a half hour... and stays crappy for at least a few days. I end up stalling at low RPMs on the trail.

It runs poorly up to about 900-1000 rpms, and up from there is fine. Given that its still slightly sputtery at 900 rpms would imply a mixture problem... and I'd guess this was due to clogged idle tubes? Does that sound right? Why would they get clogged? Its not even dusty.. and not a whole lot of water (though some).

Its a pain, any ideas? I'm heading out of town w/ it this weekend, and was hoping to address the problem. Or maybe a quick trail solution when this happens (other than increasing the idle speed).

Thanks,

Sam88Jeep
Note: My setup doesn't use computer or anything like that.

'88 YJ 4.2L, 32/36 Weber, HEI, 2.5" spring lift, 31" BFG ATs.
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post #2 of (permalink) Old 08-31-2001, 02:10 PM
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Re: Get bad idle after offroading

Check the float chamber. You might have some crud laying in the bottom that gets shaken up and into the idle system to cause a poor idle, but on road driving doesn't stir it up.

Brad
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VP RockGarden 4 Wheelers, Aztec, NM
RockGarden 4 Wheelers
post #3 of (permalink) Old 08-31-2001, 02:14 PM
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Re: Get bad idle after offroading

Actually, that'd make a lot of sense. Not to sound stupid, but how exactly would I do that.

I can open the butterfly choke on top of the carb, to look down into the carb. Is what I'm seeing the the float chamber? If I then press on the throttle lever, the second set of valves open and I can see the bottom of my intake manifold.

Or do I have to take apart the carb to see the float chamber?

Aside from the mixture and idle screws, I don't know the carbs all that well. I used to clean the idle tubes on my Carter carb... that's the only reason I had to think of that earlier.

Thanks,

Sam88Jeep

'88 YJ 4.2L, 32/36 Weber, HEI, 2.5" spring lift, 31" BFG ATs.
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post #4 of (permalink) Old 08-31-2001, 03:53 PM
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Re: Get bad idle after offroading

Your float chamber in the Weber is off to the side, you need to partially disassemble the carb to get to it. For a very good manual on adjusting the Weber and info on repair go to http://www.webercarburetors.com and click on technical information. They have an online manual in pdf format.

Brad
ORC Land Use Editor
Land Use
VP RockGarden 4 Wheelers, Aztec, NM
RockGarden 4 Wheelers
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