1994 Jeep Cherokee Engine stuttering

Tiny
STEVENHAUGE
  • MEMBER
  • 1994 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Recently my 'Check Engine' light came on, so I knew something was up, but the car performed fine. A few days later I noticed the engine would 'stutter' occasionally while running. I could be cruising at 60mph on the highway and it would suddenly stutter and lose power, and then, a moment later it would kick in and be back to normal. It also does this sometimes when I'm just idling at a stoplight. Same thing: stutters as if it's going to stall, and then without any prompting from me, the engine revs itself and goes back to normal. I look through my repair manual and it seems it could be one of several things, so I wonder if you can reduce the possibilities for me. Also, does my jeep have the diagnostics cable for electronic diagnosis? Where would it be located? My neighbor has one of those devices.
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Friday, November 27th, 2009 AT 10:09 AM

7 Replies

Tiny
RACEFAN966
  • EXPERT
OK the diagnostic port is located just under the dash use pic below. Now this code reader that your friend has must be able to read OBD1. If it can't then call around to your local parts store's and see if one of them offer a free scan and if so have them scan it. Get back to me with the codes and we will see what the Jeep is trying to tell us.
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Friday, November 27th, 2009 AT 10:24 AM
Tiny
STEVENHAUGE
  • MEMBER
I'm struggling finding a parts store with a code reader that will work on my 1994 Jeep. Any suggestions?
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Monday, November 30th, 2009 AT 11:28 AM
Tiny
RACEFAN966
  • EXPERT
This is a chrysler system so try the key on key off trick see if it works. What you do is turn the key on then off do this 3 times leaving the key on the 3rd time. If this works then the engine light will start to blink the codes to you. It will do it as such. 11 will be one blink the short pause then one blink, then longer pause and then the next code. Let me know if it works otherwise you will either need to have it scanned at a shop or purchase an OBD 1 and 2 scanner.
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Monday, November 30th, 2009 AT 8:26 PM
Tiny
STEVENHAUGE
  • MEMBER
Yay! It worked! I tried your key-on, key-off trick and the 'Check Engine' light blinked a code at me. Here's what I got: 1 2 (then it beeped) 2 1 5 5
I did it several times to verify the sequence, and this is correct. The beeping always sounded after the second number, too. Can you tell me what the problem is from that code?
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Tuesday, December 1st, 2009 AT 7:59 AM
Tiny
RACEFAN966
  • EXPERT
Ok here it is. Code 12 say's that the battery was disconnected. Code 21 is an O2 sensor problem we will have to look into that. Code 55 means end of codes. What you need to do is inspect all the wiring to the O2 sensor if all looks good then you will need to replace the O2 sensor. If by chance this don't fix it then we will need to get a digital multi meter and make a jumper wire or two and do some wire checking to determine if the PCM may be the problem (not very likely). After you replace the O2 then clear the codes. To clear the codes simply disconnect the battery for a min or so. Now if you have a factory alarm then you will need to do the relearn procedure as such, before reconnecting the battery put the key in the drivers door lock, now reconnect battery then cycle the door lock once, horn may sound three times to tell you it is activated. Thats it. Let me know how it goes.
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Tuesday, December 1st, 2009 AT 10:09 AM
Tiny
STEVENHAUGE
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Can you give me more specifics about the 02 sensor? Like, where it's located, and what am I looking for when I inspect it?
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Tuesday, December 1st, 2009 AT 10:51 AM
Tiny
RACEFAN966
  • EXPERT
The O2 sensor is in the exhaust system. It will be either in the exhaust pipe before the cat or in the exhaust manifold. Here is a pic so you know what you are looking for. Now what you check for is any bear or chaffed wiring or broke wires or? If all look normal with the wiring to it then replace it. It will probably cost about 60 buck.


http://www.2carpros.com/forum/automotive_pictures/249564_834280_1.jpg

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Wednesday, December 2nd, 2009 AT 10:19 AM

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