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Unread 12-27-2013, 06:40 PM   #1
Rapterlined
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1991 YJ Wrangler 
 
Join Date: Apr 2013
Location: Burlington, NORTH CAROLINA
Posts: 43
Jeep YJ spitting and sputtering, Loss of power

okay first off let me say thanks to anyone who can help. also i know there is a search bar but i couldn't find one exactly what i needed. so my jeep has the inline 6 and 117,000 miles on it. For some reason it hardly EVER stars on the first turn. But also it seems to spit and sputter and loose power around 10 minutes after driving it. sometimes it will buck but its odd and very annoying. Ive already replaced the MAP sensor, plugs, wires, fuel filter, Fuel pressure regulater, and the ignition coil, crank shaft position, distributor cap. im running out of ideas so any help would be much appreciated. Thanks in advance

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Unread 12-27-2013, 07:27 PM   #2
pete1991YJ
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1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
Posts: 1,623
I'm betting the O2 sensor. You may have replaced everything *but* the one part that actually needed it. Have you checked for error codes?

The big clue is that it only does it after running for a while -- the computer does not read the O2 sensor until its up to 185 degrees at the thermostat. If it starts reading the O2 sensor at this temperature, and gets a weird reading, it goes into a default mode.
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Unread 12-29-2013, 07:54 PM   #3
89yjislanderr
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1989 YJ Wrangler 
 
Join Date: May 2013
Location: columbia, sc
Posts: 104
one thing my jeep did was a distributor wire was sometimes contacting some other wire/metal pieces and shorting. but it would only occur while driving and if a bump hit it the right way and such, causing it to buck and jerk. it may be something as simple as that
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Unread 12-31-2013, 02:18 PM   #4
meangreeny
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1992 YJ Wrangler 
 
Join Date: Dec 2009
Location: PORT ALBERNI, BRITISH COLUMBIA
Posts: 89
sounds like a throttle position sensor to me
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Unread 03-14-2014, 07:40 AM   #5
Rapterlined
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1991 YJ Wrangler 
 
Join Date: Apr 2013
Location: Burlington, NORTH CAROLINA
Posts: 43
Replaced the throttle position and o2 sensor, I also replaced the fuel pump and still still not running right
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Unread 03-14-2014, 07:53 AM   #6
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,544
You were about right with the O2 sensor. Check your manifold for loose/missing bolts, especially on the rear of the exhaust manifold near the firewall. Check the exhaust manifold for cracks, especially around the collector tubes.
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Unread 04-09-2014, 10:52 AM   #7
Rapterlined
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1991 YJ Wrangler 
 
Join Date: Apr 2013
Location: Burlington, NORTH CAROLINA
Posts: 43
I finally said screw it, I took it to a shop on Monday no info yet!
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