89 Cherokee 4.0 severe power loss & backfire! - Page 2 - JeepForum.com

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post #16 of 17 Old 04-26-2010, 11:52 PM
talentjeep
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1987 XJ Cherokee 
 
Join Date: Oct 2009
Location: talent,or
Posts: 1,226
i believe the Renix system doesn't engage fully until 300 RPM to prevent dry starts. computer was designed by an aircraft manufacturer so they wanted to prevent damage to the engine.

once you get the hang of it you can let off the key half a second before it fires and save a few starter turns. almost an art form in an of itself.

thanks for posting the fix! many people just run off and forget about us XJ lovers and leave us wondering what happened.


'87 XJ Pioneer with 32" KM2s, etc.
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post #17 of 17 Old 06-05-2014, 10:08 AM
Jeep93cherokee
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1993 XJ Cherokee 
 
Join Date: Jun 2014
Location: Sykesville
Posts: 2
Good idle but no power or acceleration

Hey guys big issue even the mechanics an my self are clueless an can't figure it out but here's the problem has good idle an once you accelerate it throws a fit back fires an has no power I changed the cap,rotor,wires,plugs that didn't fix it so I put a fuel filter on it still didn't fix it so my boss came over an we tried to pull codes an nothing so he said start it up so I did an he unplugged the crank shaft sensor an bam!! It ran like a champ for 2 days while we ordered a new one but when I put the new one in it still didn't fix it so he said it had to be the computer so I replaced that still nothing an it has no vacuum leaks cleaned all the grounds an still nothing tried to reset the computer runs good for 5 seconds an does the same things anyone have a idea or hint to throw out this things got me confused to no end
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