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Unread 02-20-2012, 10:35 PM   #1
HD7908
Registered User
1989 YJ Wrangler 
 
Join Date: Feb 2012
Location: Gig HArbor, WA
Posts: 24
HELP!!! YJ rough idle

I have an 89 YJ 4.2. I've replaced the carb with a weber, done a full tune up and time, and a nutter bypass along with replacing the intake and exhaust gasget's and even had a tech check my carb adjustments ant timing. the thing still runs rough at idle, really bad when its cold, and it gets worse when i out it in gear. Its an automatic trans by the way. It doesen't seam to be using oil so I'm running out of ideas here and I'm starting to wonder if the motor is shot.

Any ideas would be helpful

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Unread 02-21-2012, 12:10 AM   #2
04WJny
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1987 YJ Wrangler 
 
Join Date: Feb 2010
Location: Long Island, NY
Posts: 615
did the problem just suddenly happen or was it slow? did you do the tune-up and the other things after your engine problem? what makes you think its not using oil
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Unread 02-21-2012, 12:25 AM   #3
HD7908
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1989 YJ Wrangler 
 
Join Date: Feb 2012
Location: Gig HArbor, WA
Posts: 24
I bought it and It had the old carter carb on it and ran like crap all the time. I replaced that and it still ran like crap but better. Did the bypass and that helped with everything but the idle. couldent get the weber to tune in right so I took it to a tech and he found the intake gasget was bad so I replaced that. Now as long as its not at idle it runs fine, but at idle once its warmed up it evens out till you put it in gear. Fuel filter maybe?
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Unread 02-21-2012, 12:26 AM   #4
HD7908
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1989 YJ Wrangler 
 
Join Date: Feb 2012
Location: Gig HArbor, WA
Posts: 24
I changed the oil two weeks ago and it doesn't seem to be losing any. It has a slight rear main leak, but there is no blue smoke.
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Unread 02-21-2012, 12:42 AM   #5
tyler1234567
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1990 YJ Wrangler 
 
Join Date: Feb 2012
Location: beale afb, ca
Posts: 61
I bet you just need to adjust the two brass knobs on either side of the carb right below the air filter plate. You can just turn them with a socket.

Also there is a flathead screw that is black. Its way down on the drivers side of the throttle body/carb and it has a spring on it. Adjust that either way until idle is stronger.

For the weber
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Unread 02-21-2012, 01:02 AM   #6
HD7908
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1989 YJ Wrangler 
 
Join Date: Feb 2012
Location: Gig HArbor, WA
Posts: 24
What does that do?
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Unread 02-21-2012, 02:41 AM   #7
tyler1234567
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1990 YJ Wrangler 
 
Join Date: Feb 2012
Location: beale afb, ca
Posts: 61
Quote:
Originally Posted by HD7908
What does that do?
if you play with those adjustments you can smooth out your idle.
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