Question about 1999 Jeep Cherokee

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My 1999 Jeep Cherokee is having starting issues. The battery has been replaced and I just had it tuned up with new spark plugs and spark wires and also a crank sensor. The mechanic is having a hard time determing what the problem is. At times it will start just fine and run fine, but then I'll shut it off and then when I restart it, it won't turn over. I have to floor it to get it to start which it usually does, but it's tough to start. The problem is then after a few rough starts like this, it might start fine and I won't have any problems for another week or so. Any ideas?

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  • mmiles04 Apr 23, 2009

    You asked me to clarify a question I had about my 1999 Jeep Cherokee having starting issues.

    It starts fine first thing in the morning. I can take my daughter to school and then when I leave for work about 30 minutes later, I have a hard time getting it started. I'll get to work, turn it off and then immediately try to restart it and have a hard time again starting it back up. If I pump the gas pedal, it starts, but starts hard and then seems to backfire, emitting a strong gas smell. So basically it has always started, but sometimes it starts easily and sometimes it starts rough.

  • mmiles04 Apr 23, 2009

    I'm not sure about the engine size. I just tried to start it and it started great the first three times (turned it off and then tried again), but then on the fourth try it started rough and I had to pump it. I have tried to start it by holding down the pedal and it does seem to start better.

  • mmiles04 Apr 23, 2009

    I wouldn't be able to pull the spark plug now as it is dark outside. I saw my mechanic pull the spark plug off so I might be comfortable doing it. They were all just replaced a few weeks ago though.

  • mmiles04 Apr 23, 2009

    Even my regular mechanic can't figure out what is wrong. So if I give him the information that you gave to me, he would know how to check that?

  • mmiles04 Apr 23, 2009

    I'm also a AAA member and I can get a 24-pt auto inspection for free at an approved auto repair shop. Do you think they would be able to determine the problem?

  • mmiles04 Apr 23, 2009

    Thank you for the time you have put into helping me with this problem.

  • Anonymous Apr 29, 2009

    My jeep's batt died the other day, and when I tried to start it back up, the same thing happened. I'm not sure about yours, but mine is fuel injected so pumping the pedal will result in flooding the engine. The best way is to hold the pedal to the floor while starting.
    Anyways, It could be the fuel filter, plugged fuel injectors, or other parts. If it's not getting enough fuel it will obviously stop the engine, so that would explain why it runs better while holding pressure on the throttle.


  • Anonymous May 03, 2009

    My 99 Grand Cherokee is doing the exact same thing.Runs fine for hours or days.Then stop at a store come out and no start unless I step on the gas.If I do not hold the gas it will stall.It won't idle.If I double foot and get it moving after a few seconds of driving it runs fine, idles at stops and has plenty of power. Again for days no problems then all a sudden it again will start hard and not hold idle. Get it started and rev it for a few minutes and it will then hold a idle and run fine for a while.

    I have the 4.0 and it has 115k.

    I first thought fuel pump or filter or maybe even injectors.But after a few tests. I was able to determine that it was getting gas without my stepping on the pedal during cranking, and removal of the plugs after a 20 minute cool down showed plugs to be in healthy condition.Good color and not wet.So these two things lead me to believe it is NOT any of those 3. Now am leaning toward sensors but am not sure, if it is a bad sensor why would it start by pushing the gas?

  • Mike Butler
    Mike Butler May 11, 2010

    What I did with a Dodge van that was having same/similar problem, and I suspected injector(s) leaking was as soon as I got home from a trip, let it sit and cool down a little, to about the time I would normally have trouble restarting, then pulled the spark plugs & found 2 of them wet from gas, which indicated to me that fuel was still entering cylinder after engine shut off. Had those 2 injectors rebuilt, problem solved. Any chance the vehicle has had a good injector flush /cleaning done? Might be something to consider, but I don't put a whole lot of faith in additives in tank being able to do same.

  • Mike Butler
    Mike Butler May 11, 2010

    It's making me lean toward injectors leaking down. Before I go any further on that track, what engine is it, 2.5L or 4.0L ? Have you by any chance, rather than pump the gas after it's warmed up & shut off, then try starting, just try holding it to the floor instead, but let off quick when it does re-start. See if that works any better for you. (that's not my solution, just a test I want you to try.) There's a couple of sensors I'm considering too, but these tests I'm putting you through, should help pinpoint better. How hard do you think it would be for you to pull the spark plugs after it's been run for a while?

  • Mike Butler
    Mike Butler May 11, 2010

    Ambient temperature have any bearing on it? How about time, if to try to restart within 5 minutes after shutting off, or 20 minutes after shutting off? How about first time of the day after sitting all night?

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  • Jeep Master
  • 6,674 Answers

Actually, if he has a fuel pressure gauge, and monitors it with engine off for a while, it may show pressure loss, which would be a good indicator. He should also be able to zip those plugs out for inspection too. As far as the 24 point inspection goes, I believe they are mostly looking at fluid levels etc, quick stuff to replace. Probably be better to save that for when ready for that spring tune-up & oil change time.

Posted on Apr 23, 2009

  • Mike Butler
    Mike Butler Apr 23, 2009

    Glad to help. Keep me posted.

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SOURCE: power windows won t work

I alsao own a 95 grand cherokee.
Certain windows would stop working when the drivers side door closed. I removed the rubber boot in between the door hinges that shields the wiring harness and found several wires in a condition of broken and/or shorting.

I will say these shorts also caused the battery to drain on several occasions when the car sat overnight.

It is easier to re-attach and work with these wires if you remove the harness plug from the door. There is an allen screw located in the middle of the plug...sorry I dont remember the size....

Hope this helps

Posted on Jul 05, 2009

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