Renix Era XJ and other questions
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
They can be supper reliable. Go years and years with no issues. I got so complacent.....then I finely looked at my plugs one day, (last year) .55 !! 
OK, guess there IS maintenance

OK, guess there IS maintenance
CF Veteran




Joined: Nov 2010
Posts: 5,841
Likes: 117
From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
They're pretty reliable and everything on them can be tested with a meter.
Which is good, because they are PRE OBD, which means there are no codes to help you isolate faults.
It just takes a while to "get to know" them!
I had an 88 which I cut my Renix teeth on.
Which is good, because they are PRE OBD, which means there are no codes to help you isolate faults.
It just takes a while to "get to know" them!
I had an 88 which I cut my Renix teeth on.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Renix is the name of the fuel injection system. It was a combined effort of RENault who owned 46% of Jeep at the time, and BendIX, a large woeldwide automotive supplier.
TJWalker and Flintstone are correct. They're fine. I also cut my teeth on these as I was Service Manager and shop foreman at the local dealership for 12 years, including the time when Renix was introduced in 1987. Quite a learning experience and BTW, all my Jeeps are Renix era.....
TJWalker and Flintstone are correct. They're fine. I also cut my teeth on these as I was Service Manager and shop foreman at the local dealership for 12 years, including the time when Renix was introduced in 1987. Quite a learning experience and BTW, all my Jeeps are Renix era.....
CF Veteran
Joined: Feb 2011
Posts: 3,074
Likes: 0
From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
i agree with everyone here... my whole family has only owned Renix era Jeeps... and my Dad also worked on them when they were new... they seem to be the best in my opinion very few problems...
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