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Unread 07-13-2014, 07:56 AM   #1
bownby76
Registered User
1999 TJ Wrangler 
 
Join Date: Jul 2014
Location: Slidell, LA
Posts: 2
2.5 4 cyl problems

Hey guys I'm new to this forum and need help with a mechanical issue with a newly purchased 99 wrangler with a 2.5 4cyl. I was driving it home last night and noticed that every few minutes it would lose power for a second or two. It did not do this until about 30 minutes into my trip. I have found some threads with some similar issues but not exactly specific to mine. Can anyone please help. I know the transmission and rear end have been replaced, and also the radiator.

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Unread 07-13-2014, 08:14 AM   #2
TCazes
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1995 YJ Wrangler 
 
Join Date: Jul 2014
Location: Baton Rouge, La
Posts: 116
Were you running the ac? I know when my ac kicks in it's obvious. I'll lose 5mph almost. If you were using it the whole trip and it started towards the end check your fluid levels. If your fan clutch is going out and manifold pressure gets too high it will tax the 4 banger pretty well
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Unread 07-13-2014, 03:51 PM   #3
ryan_h
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: marietta, ga
Posts: 31
Check your spark plugs and wires. Mine had this issue recently and there was a slit in the rubber boot on one of my wires, causing the spark to fail sporadically with a temporary loss of HP.

If the plugs and wires check out, it could be a clogged catalytic converter, failing/clogged fuel injector, failing O2 sensor, or worst case, a blown/burnt valve.
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Unread 07-13-2014, 06:07 PM   #4
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,410
99 is a tj. This is the yj forum. The first thing you want to do is run up to the parts store and have them tell you what fault codes you have. The diagnostics are really good on the tj. I am betting it's something like an o2 sensor.
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Unread 07-14-2014, 07:15 PM   #5
bownby76
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1999 TJ Wrangler 
 
Join Date: Jul 2014
Location: Slidell, LA
Posts: 2
Thanks guys, and sorry for posting this question on the wrong forum. I found the problem. When I went to check the O2 sensor it was very loose, so I tightened it and it hasn't done it sense.
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Unread 07-15-2014, 05:22 AM   #6
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,410
Welcome to the forums.
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