6 cyl 90 wrangler idle problems - JeepForum.com
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Unread 04-24-2010, 03:28 PM   #1
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Join Date: Apr 2010
Location: 06340
Posts: 4
6 cyl 90 wrangler idle problems

I picked up this 90 4.2 wrangler, and the carb is after market. This is what it looks like.

I think it is one of these two, I am not sure though.

Carburetors by Weber for Jeep Wrangler YJ

I am having problems with the idle. It seems to stall out at low RPMs. The jeep runs great at higher RPMs, just not so well at idle. It also sometimes dies after the engine starts up, but then starts up right away.

Any ideas would be helpful. I was thinking maybe the nutter fix, but my understanding is that is for the OE carb. I also saw this guys fix. But I don't know

Easy Fix for Jeep 258 Carter BBD Idle Problem - - Jeep at Off-Road.com

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Unread 04-24-2010, 06:26 PM   #2
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1990 YJ Wrangler 
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Location: Boston MA
Posts: 1,443
Well the carb may need to be tuned up/cleaned/rebuilt. there are many threads on the forums about tuning webers.

that being said, if the Nutter has not been done then you will need to do it even though you have a weber carb. that is because the computer is still controlling the timing and god knows what it is doing to it. Read up on the Nutter and get that done so that you have good timing and then you can go from there. also look into the "team rush" ignition upgrade on this forum and the CJ forum. early 80's CJ had virtuallt the same engine and you can get good tips from the CJ forum.
also research what old emissions components you can remove, right away I see the solenoids on the valve cover and the switches right behind there on the firewall can be the first to go .

read this site, you can learn what everything is to figure out what can go or stay:
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Unread 04-25-2010, 10:31 AM   #3
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thank you for the input. I figured out that the carb is actually a EMPI 32/36 X, not a weber. The thing is I have looked at the nutter, but I can't figure out whether its been done yet or not. I will look into getting rid of the vestigial equipment.
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Unread 04-25-2010, 01:56 PM   #4
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You may want to give your EGR a quick once-over and make sure it isn't open during idle. If you reach around behind it, you can feel the plunger. Make sure it moves freely and stays in the closed position at idle.

Just a thought, hope it helps!


holley carb tuning
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