Question about 1993 Jeep Grand Cherokee

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Our 1993 jeep grand cherokee (v8) with 65,000miles shakes

We had our jeep in the shop 4 months ago and they replaced the dist.cap and rotor, and gasket and checked the spark plugs.  We drove it on the freeway home and it was still shaking occasionally when holding a constant speed between 65 and 75mph (more like a hiccup/jolt).  We were told to just ignore it because the car doesn't recognize that it has a problem yet.  Now after driving it for 3 hours on the freeway this week it no longer does that but now it runs heavy, it shimmies at idle and when accelerating.  what could it be and can we fix it ourselves?

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  • meganschro Jul 18, 2009

    no check engine light, no loss of power although my husband checked the check engine light codes and it is saying that the battery was recently disconnected from the PCM and that may make it run rough for a while. we haven;t disconnected the battery could this mean that the PCM is faulty and causing the vehicle to run rough?

  • meganschro Jul 18, 2009

    we ran the codes previously with a mechanic after it had been in a jeep shop and the codes were fine then...it is only now that they are reading that there is even an issue.

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I don't know if you can fix it because you don't know what "it" is yet!!! It is my opinion that any shop that would release a vehicle without verification that a problem had been repaired is not worth returning to. To do any testing, you will need d decent digital volt/ohmeter and a manual to guide you through tests. Most larger parts stores do scan tests free and also carry either haynes or chilton vehicle specific manuals. If you have a specific question, I may be able to help you.

Posted on Jul 18, 2009

  • Richard Scordino Jul 18, 2009

    If the shop that worked on it disconnected the battery for any reason, that code will stay there for a pre-set number of start cycles. (ii think fifty) When that code disappears, if there are any engine problems, then you will need to do some checking to find out what and why. That's also when any previous codes will re-appear if a problem is still there)

  • Richard Scordino Jul 18, 2009

    You are going to have to wait for the battery disconnect code to disappear before going further with code testing. Pcm must be getting power or it would not run. From what I'm reading, pretty much you had no problem four months ago, brought to a shop for a basic tune up and now have had a problem that has lasted for four months and the shop says that is normal? "running heavy" could mean that computer is in "safe" mode but generally the check engine light would also be on. Testing as I initially recommended must be done or you will learn nothing about what's going on here.

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Also check your pcv valve and the hose that's on the valve( about a foot long) I had a small tear on the base of mine and it caused just enough of a vacuum leak to shake at idle

Posted on Feb 29, 2012

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You need to have the ignition secondary output checked, even if the spark plugs look good they may not be. Also the ignition wires may have to be changed that is where the testing of the ignition comes into play. Also you have not mentioned if there is a check engine light on or if it works at all. Does the light come on when you turn your ignition key to the run position post starting RE: before you start or engaged the starter? You have stated runs heavy is this a loss of power?

Posted on Jul 18, 2009

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