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Old 05-14-2011, 12:02 PM   #1
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Wierd problem with my YJ

I recently bought a 95 Rio Grande and have been trying to chase down a very pesky little gremlin. It had starting issue's at first which after some investigation figured out it was a faulty PCM. I replaced it with a reprogrammed one which cured this problem and started and drove fine for a week or so. It then developed an intermittent issue of running rough, coughing, sputtering and backfireing...sometime's running fine, sometimes like crap. Idle's fine but put it under a load and throw's craps. I figure it has to be electical in nature but not sure. Beside's the PCM I have replaced the following. Plug wire's, cap, rotor, coil, pick up stator, fuel filter, fuel preassure regulator, and throttle position sensor. I have run the codes with the ignition a bunch of time's which is why I replaced the stator and TPS as it gave me that code in both those occassions. All of these replacement's seemed to fix the problem but the jeep just keep's going back to haveing it's problem. I starting wonder if they programmed the PCM properly as I keep getting code 33 which has to do with the air conditioning and the jeep doesn't have air, and code 15 which is the distance position sensor which I can understand as I put 235 size tire's on instead of the 215's which were on it. If the PCM isn't right I figure it wouldn't have run fine for a while and then go dog nut's like it does then come out of it and run ok. Any idea's on this is appreciated as the jeep is now sitting 75 mile's away where I work at because it didn't want to play yesterday when I got off...drove home the company one ton. Thank's in advance for any help you may have. Patrick

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Old 05-14-2011, 12:49 PM   #2
Join Date: Jan 2010
Location: Las Cruces, NM
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The code 33 comes up in all instances so don't worry about that one. If the jeep ran good after the PCM install and then started acting up again I would suspect you got a bad PCM.

(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
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Old 05-14-2011, 02:29 PM   #3
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Thank's for the head's up on the code 33 GaryK and I think your probably right about the PCM being bad. I'm going to call the place I ordered it from Monday and see what they say and expect they'll try to stand behind they're product. But there's a one year warrenty on it they'll have to honor. Anyway, thank's again. Pat
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Old 05-14-2011, 02:39 PM   #4
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I dont know for sure about your PCM, but I know on others I have had problems with you can reset PCM by disconnecting battery for awhile and then connect it back up and see how it runs. I have been told that when it resets and starts running bad after awhile it is either a bad PCM or one of the sensors sending bad info to it.
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Old 05-14-2011, 03:19 PM   #5
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Yeah, I tried the battery dissconnect a few time's, in fact every time I replaced the many thing's I've replaced on the YJ. The last time I had it at home and it was running like crap I dissconnected the battery for a full over night and in the morning it ran great. It's not given me the MAP sensor code yet so maybe I'll burn the $35.00 buck's on that for the heck of it. What do you guy's think about maybe a bad vac line somewhere? Thank's for the response YJ Jeep Freak.
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