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Unread 08-18-2011, 10:17 AM   #1
dougbrown
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1998 TJ Wrangler 
 
Join Date: Apr 2011
Location: Gloucester city, New Jersey
Posts: 520
89 jeep runs crapy under 1,000 rpms!

My 89 yj wrangler with a 4.2 I6 and webber 32/34 carb run crapy under 1,000 rpms. It doesn't idle steady and never has. Wants to idle any where from 900 rpms down to 500 on somedays. It seams over the last few days it just wants to stall when your starting out in first gear. It drops way down and then pops and sputter. If I push the clucth in it will come back up to 700 or 800. If I reve it up and then let the clutch out she fine. It also does it down shifting too at time. Once your going it seems to run just fine. It has a little owder to the exhaust but no smoke. I had replaced and caped all the vacuum lines. Also rebuild the carb a few months ago when I bought the jeep. I don't want to take it to a shop just yet so any info would be great.

I want to do the nuter by pass but not sure if I'm keeping that engine in it.

Thanks Doug!

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Unread 08-18-2011, 10:34 AM   #2
dancytron
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1990 YJ Wrangler 
 
Join Date: Jun 2008
Location: st. louis
Posts: 1,117
You should do the Nutter. The computer is trying to control the stock carb but can't because it isn't there anymore. It is controlling the timing but is confused. More than likely many of the sensors the computer relies on have failed by now. After you do the Nutter you can tune it without the computer interfering.
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Unread 08-18-2011, 10:46 AM   #3
swatgig17
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1987 YJ Wrangler 
 
Join Date: May 2007
Location: Central MA
Posts: 85
Quote:
Originally Posted by dougbrown View Post

I want to do the nuter by pass but not sure if I'm keeping that engine in it.

Thanks Doug!
You probably spent more time capping vac lines than you would doing the nutter. I don't remember spending much time on it.
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Unread 08-18-2011, 02:47 PM   #4
dougbrown
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1998 TJ Wrangler 
 
Join Date: Apr 2011
Location: Gloucester city, New Jersey
Posts: 520
The nutter by pass is all ele right?
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Unread 08-18-2011, 03:01 PM   #5
dancytron
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1990 YJ Wrangler 
 
Join Date: Jun 2008
Location: st. louis
Posts: 1,117
Since you already have a different carb, it is just the two wires bypassing the computer and retiming it. Then you can tune the carb so it runs right (unless something else is wrong with it).

http://www.jeepforum.com/forum/f8/ho...bypass-522262/
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