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Unread 09-19-2013, 06:10 PM   #1
spottedfrog
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1979 CJ5 
 
Join Date: Sep 2010
Location: Grand Junction, Colorado
Posts: 828
Help me help a friend please.

So I'm trying to help a friend long distance.
He has a '89 YJ SE 2.5L, 5 speed, owned since new and bone stock.
He said that It will randomly only get up to 20 mph. while driving and sometimes refuse to turn over.
He said that the vehicle was getting driven regularly until it developed problems.

I'm unfamiliar with the 2.5L and had thought that it was still using a carb, but apparently they are TBI.
It has new plugs/wires, starter.

I was thinking it could be possibly a problem with the vacuum advance, or with the ignition control module.
Maybe an O2 sensor?
did the 2.5L have a crank angle sensor?

What else would you suggest.
Thanks

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Unread 09-19-2013, 06:41 PM   #2
scraper
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1995 YJ Wrangler 
 
Join Date: Jul 2013
Location: Minerva, Ohio
Posts: 207
Does he have manual or Auto?

But honestly this could be a whole lot of things. Has he checked the error codes. I would start there. Let us know if we can pin point the problem area that way.
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Unread 09-19-2013, 06:42 PM   #3
scraper
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1995 YJ Wrangler 
 
Join Date: Jul 2013
Location: Minerva, Ohio
Posts: 207
NM on the manual or auto I just saw the 5 speed part in your post.
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Unread 09-19-2013, 06:46 PM   #4
spottedfrog
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1979 CJ5 
 
Join Date: Sep 2010
Location: Grand Junction, Colorado
Posts: 828
I don't think he has access to a code reader.
could also be a clogged fuel filter.
normally on a vehicle this old I'd suspect the filter, and vac lines???
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Unread 09-19-2013, 07:07 PM   #5
mudsweatNgearz
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1987 YJ Wrangler 
 
Join Date: Aug 2011
Location: Tucson, az
Posts: 489
there is no vac advance on FI
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Unread 09-19-2013, 07:16 PM   #6
scraper
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1995 YJ Wrangler 
 
Join Date: Jul 2013
Location: Minerva, Ohio
Posts: 207
Not 100% sure about an 89 but I don't think he needs any tools to check the fault codes. Follow this link

http://www.jeepforum.com/forum/f12/h...codes-1257145/
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Unread 09-19-2013, 07:28 PM   #7
bigbossd1030
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1995 YJ Wrangler 
 
Join Date: Feb 2010
Location: Edmonton, AB, Alberta
Posts: 2,515
Yup, key trick should wok just fine.
Also, could be clogged cat?
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Unread 09-19-2013, 07:44 PM   #8
spottedfrog
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1979 CJ5 
 
Join Date: Sep 2010
Location: Grand Junction, Colorado
Posts: 828
Thanks every one.
I know it can be any one of a lot tof things, that's what I'm having a hard time with especially long distance. I was hoping to narrow it down to issues that seem to come up with this model.
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Unread 09-20-2013, 08:47 AM   #9
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,414
No code reading for the 89. It was pre OBD I. You need to narrow it down. When it isn't starting you said it doesnt turn over. Do you mean the starter doesn't work?
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