Question about 1999 Jeep Grand Cherokee

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1999 Jeep Grand Cherokee stalling and not starting


I have a 1999 Jeep Grand Cherokee V6, 4.0. When i 1st get in it in the morning, it always starts up just fine, with barely a turn of the key. After driving for a while, it stalls out on me. Its very sporadic, it does always happen after 10mins of driving or 30mins of driving, but it happens to me EVERY DAY. Some time it starts right back up, but other times, i have to sit and wait for 10mins to 1hr for it to start up. Some times it starts with starter fluid and sometimes it doesnt. I have replaced the fuel pump, fuel pump screen, fuel filter/regulator, Spark plugs, ASD (automatic shut down) relay, and Fuel Pump relay, but the truck is still doing the same thing sporadically. Prior to changing the fuel pump it would be consistent with shutting off after about 10mins of driving, now its no longer consistent and i have no idea when it will shut off, mostly at the wrong time when im in a rush. CAN SOMEONE PLEASE GIVE ME some ideas on how to fix this menacing problem.

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  • mandell_anth Feb 05, 2009

    No i have not checked for codes. I took it to a shop and they had it for two days and said it never shut off on them which i dont understand because it does it to me EVERY DAY. I will try to check for the code, but should i do that when it will not start back up or at any time?

  • mandell_anth Feb 05, 2009

    Also how do i measure the fuel rail pressure?

  • mandell_anth Feb 05, 2009

    I checked another forum and they informed me to unseat the PCM, check the connectors, and reseat it and see if that fixes the problem. Is that something you would recommend?

  • mandell_anth Feb 05, 2009

    No there does not appear to be any rhyme or reason to the stall. Its not when it hits a bump, going at a certain speed, only when i brake, etc. It just happens when it wants to like its not getting gas or there is an electrical problem. I tried getting a code by turn on, turn off, turn on, turn off, turn off and no code presented itself. I guess my next step is to try to reseat the PCM as recommended and go from there. Oh yeah i just went out and tried to start it, and it started right up all three times i tried it, but i know as soon as i start to drive it, it will stall out on me.

  • erobert Feb 10, 2009

    95 jeep grand cherokee kept stalling turned out to be camshft position sensor after replacing pump filter map sensor ect

  • mandell_anth Feb 13, 2009

    Okay, i have checked for codes, by using the 3 key turn method and NO CODES appear. Nor do i have a check engine light on, which is what i assume would be a reason for the codes to appear. I have tried the "reseating method" on my PCM, and that did not help the issue. I unplugged and replugged all the connections to the PCM as well as cleaned them and greased them with electrical grease and nothing has changed. Im truly at wits end as to what the problem can be. My next step is changing the crankshaft relay to see if that will help.

  • mandell_anth Feb 13, 2009

    No the vehicle does not have an alarm attached to it. Also the truck starts up fine in the morning or after it sits up for a while. Also its very sporadic. It will run fine sometimes for 30mins to an hour, then sometimes it stalls out and wont start back up after about 10mins of driving. It has a mind of its own?

  • tiggeruc May 02, 2009

    Hi, I was reading your post. I'm currently having the same issue. Were you able to find a fix?

  • Mark Egan May 11, 2010

    The Check Engine Light does not have to come on for a code to show up.

    If the three on/off idea didn't work, did you get indication that trying to get codes in this way was an Option - as in, did your get any readout saying OK?

    Take the Jeep to a car store that will let you borrow their code reader, just to be sure.

    Let us know what you find. A set of Factory Service Manuals would be good to have right now. But ti sounds like the problem is intermittent, and those are hard to diagnose.

  • Mark Egan May 11, 2010

    Does the vehicle have an alarm, and if it does, is there a key under the dash that your supposed to pull out to protect it?

    Not certain it was clear on the getting the code's, but to be sure, when you turned the key to ON, you didn't start it, but just to ON, then off, then ON, etc.? You probably did it right, but just want to be sure.

  • Mark Egan May 11, 2010

    I'm going to say that the shop didn't drive the Jeep, they just started it up and let it run/idle, and didn't drive it for an hour.

    The "reseat the PCM" sounds like a good idea. Have you noticed if the Jeep dies after you hit a bump or anything road related?

    As for measuring fuel rail pressure, and a pretty good resource for diagnosing the problem, see if there is a local public library that has the Factory Service Manual (not Hayne's or Chilton's or Motor's) for your Jeep. The FSM's have excellent if/then/else troubleshooting charts, wiring diagrams, and dissassemblt/assembly instructions that the dealers use. You usually can not check them out, but you can make copies of the important pages. Each Model year and Model is made up of 3-4 books.

    You might also try . I've used that site quite a bit to help me with my '03 Cherokee. I happen to have the same 4.0L engine as well.

    Reply back any other questions, or if you need someone to bounce ideas and thoughts off of.

  • Mark Egan May 11, 2010

    You've changed all that stuff, and that is all good, but, have you looked for codes in the computer, and, have you measured the fuel rail pressure? I know, fuel rail pressure should be OK with all you've done, but it could be a clue to verify.

    I know on my '03 Cherokee, I can turn the key to on, then off, then on, then off, then on, and the current stored codes will show in the mileometer, although my mileometer is 7 segment display, not wheels. Not sure about yours.

  • Robert Leverone
    Robert Leverone Sep 13, 2013

    9 times out of ten if your jeep stalls and wont restart it is the camshaft position sensor located on the top of the transmission bell housing ,it tends to get oil and fluids that foul it out ,replace it and you should be fine .



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  • 33 Answers

Since you've replaced many of the usual suspects (fuel pump etc.) you might want to look into testing or simply replacing the crankshaft position sensor or the camshaft position sensor. If you intermittently lose one the these signals it would cause the problem you describe.

Posted on Feb 05, 2009

  • EricBP Apr 17, 2011

    To: mandell_anth
    I was wondering did you ever find out what was the problem, because my jeep does the exact same thing



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