Help! 89 Yj bucking and power loss. - Page 2 - JeepForum.com
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Unread 03-20-2013, 10:42 AM   #16
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,987
Running better cold is a big clue. The system goes closed loop when it warms up and starts using the O2 sensor to set air fuel. Check the O2 sensor and the exhaust manifold for cracks especially around the collector tubes and for loose or bolts or gasket leaks. You can experiment and disconnect the O2 sensor and it will run in a default mode for the calibration and see if it makes a difference. The other thing we have that is different then the others is the egr. It is the pipe setup under the manifold going to the exhaust. Look for any leaks on the pipe.

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Unread 03-20-2013, 10:44 AM   #17
duckhunter17
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1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
Thanks ill get my meter out this evening and check ill let yall kno
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Unread 03-21-2013, 06:14 AM   #18
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,987
Did you get it fixed? Was the O2 bad?
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Unread 03-21-2013, 09:38 AM   #19
duckhunter17
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1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
No man didnt have time though I will this weekend got to fix my tailights when I press my brake my reverse lights come on and I got a ticket( darn small town cops). But I suspect that it is the o2.
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Unread 03-21-2013, 12:39 PM   #20
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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I hope it's a fixit ticket in Mississippi. Keep us posted.
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Unread 03-22-2013, 09:40 AM   #21
duckhunter17
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1989 YJ Wrangler 
 
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Location: Long Beach, Mississippi
Posts: 17
Well they issued a work order to get it fixed in 7days then no ticket
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Unread 03-22-2013, 09:46 AM   #22
duckhunter17
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1989 YJ Wrangler 
 
Join Date: Oct 2012
Location: Long Beach, Mississippi
Posts: 17
Im still having the power loss though changed tps yesterday and no difference think I might cut the cat out today anyone know how much louder it will be
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Unread 03-22-2013, 11:08 AM   #23
schaef89
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1989 YJ Wrangler 
 
Join Date: Mar 2010
Location: Pittsburgh, PA
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Quote:
Originally Posted by duckhunter17
Im still having the power loss though changed tps yesterday and no difference think I might cut the cat out today anyone know how much louder it will be
Did you adjust the tps when you installed it? It's not plug and play like later jeep models
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89 YJ S, 2.5L/AX-5/NP231
99 WJ Limited, 4.0L/42RE/NP247
93 YJ, 4.0L HO/32RH/NP231 - Sold
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Unread 03-22-2013, 11:15 AM   #24
duckhunter17
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1989 YJ Wrangler 
 
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Location: Long Beach, Mississippi
Posts: 17
No I didnt adjust it didnt know that I could you think that would help.
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Unread 03-22-2013, 11:39 AM   #25
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
Posts: 14,987
tps, isa, wot, and fuel psr. all must adjusted when replaced. You need a meter and the service manual.
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Unread 03-22-2013, 11:47 AM   #26
duckhunter17
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1989 YJ Wrangler 
 
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Location: Long Beach, Mississippi
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What is isa and wot
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Unread 03-22-2013, 01:19 PM   #27
schaef89
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1989 YJ Wrangler 
 
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Location: Pittsburgh, PA
Posts: 846
Idle speed motor and wide open throttle sensor
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89 YJ S, 2.5L/AX-5/NP231
99 WJ Limited, 4.0L/42RE/NP247
93 YJ, 4.0L HO/32RH/NP231 - Sold
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