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Unread 10-01-2013, 05:20 PM   #1
gregamuffin
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1994 XJ Cherokee 
 
Join Date: Dec 2008
Location: Amherst, Buffalo, NY
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engine cuts out for a second on highway

Hey guys I haven't been on here in forever because I haven't had much trouble until the other day. jeep is a 98 cherokee, 4.0, 5 speed. it's got about 206k on it but had been running great for me! recently on a trip from Buffalo to Cleveland it developed an odd behavior on the highway. I had cruise set at about 73 and the whole truck jolted for a split second and then continued on. I didn't even really slow down. at first i thought it was a cruise control issue but it started doing it whether cruise was on or not. It doesn't happen around town at all and it would go away for a while if i stomped on the gas and then reset the cruise or held it at a steady speed. but nevertheless it would come back and just jolt for a second. not even long enough to see where the RPM's dip too. i pulled my codes and have a p0138 and a p0141 which i understand are o2 codes. not sure if this could be my problem or not. sorry for the long post just looking to give as much info as possible. I've made this trip plenty of times and never experienced this. need to make the trip in two weeks again so would like to have this figured out

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Unread 10-01-2013, 05:46 PM   #2
CJ7-Tim
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2000 XJ Cherokee 
 
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Location: out in the garage - Minneapolis, Minnesota
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Are all your tune-up parts fresh ? Tested the battery recently ? How old are the: 1) O2 sensors, 2) the Crankshaft Position Sensor, 3) the Coolant Temperature Sensor ?
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Unread 10-01-2013, 05:48 PM   #3
gregamuffin
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1994 XJ Cherokee 
 
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Location: Amherst, Buffalo, NY
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fresh plugs and wires, i suppose i should check the battery connections, i know the battery is good. i had replaced one of the o2 sensors this summer because i have the p0138 code and it fixed it for about a day and has since come back. Coolant temp sensor is new as well.
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Unread 10-01-2013, 06:01 PM   #4
CJ7-Tim
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That just about covers all the usual suspect except for the Crankshaft Position Sensor.
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Unread 10-01-2013, 06:08 PM   #5
gregamuffin
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1994 XJ Cherokee 
 
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I'll look into picking one up and changing it in the next few days then. Generally an easy sensor to replace? also why is this actually causing the problem? Just interested in what's going wrong here.
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Unread 10-01-2013, 06:20 PM   #6
CJ7-Tim
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Location: out in the garage - Minneapolis, Minnesota
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The CPS is a likely suspect for the symptoms described. CPS service life is about 100-150,000 miles. The CPS can be tested, but may or may not test faulty. The short explanation is that the CPS helps to tell the engine computer when to run the injectors and when to fire the spark plugs. No CPS signal means the computer does nothing and the engine doesn't run for a moment.

If you buy a new CPS, get a genuine Jeep CPS, or the premium one from NAPA.C heap crappy “Lifetime Warranty” parts are often out of specification or even failed right out of the box. They usually also have a shorter service life than better quality parts. Buy good quality repair parts and genuine Jeep sensors for best results.
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