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Unread 10-05-2004, 04:34 PM   #1
jaredlangston
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Car dies when I let off gas

My 99 cherokee sport died when I let off the gas. When I went to start it I had to give gas to even get it started. When I did start it as soon as I let off the gas it died. I checked underneath and no leaks or the smell of gas. So, I started it and gave it a little gas just enough to keep it from dying and put in real quick into drive. Drove around the parking lot just fine. When I stopped it didn't die ran fine. Pulled back into a spot turned it off and back on and it started right up. Drove it home. I'm going to let it sit for a couple hours and try to start it. Can anyone explain to me what happed and if I need to replace anything.

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Unread 10-05-2004, 05:13 PM   #2
XJ1990
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A few years back my moms '99 Grand Cherokee Limted had the same problem... Found out it was the IAC(Idle air control). Same symptoms and everything so that could be it.
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Unread 10-05-2004, 06:04 PM   #3
stuartgray
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Definately sounds like a minor problem. One of the many emissions related sensors most likely. Just gotta figure out which one
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Unread 10-05-2004, 10:29 PM   #4
DefaZ
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My 97 did that for a while and it completely went away when I replaced the battery.

You might want to get yours checked out before taking the problem too far....

....or else might occur.
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Unread 10-05-2004, 11:19 PM   #5
Islandroaddie96
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Yep, check your batt.

Same thing happens to me every time I had to get a jump before I replaced the batt. My theory is that since the computer feeds directly off the battery and requires a certain amount of power for it to run, it will quit if the battery is not putting out enough juice. The only way to keep it from dying, is keeping the alternator output up enough to keep the battery strong. The funny thing is that the battery has enough juice to crank the engine, but not keep the electronics going. Once you build a significant battery charge, the motor will be able to idle normally (as what happened in your case). Let it sit overnight and see what happens.

Good Luck,

Peter
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Unread 10-06-2004, 05:46 AM   #6
boandjill
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Check your throttle body control

I had the same problem last year on my 99 SE. Had a filthy throttle body. As soon as a let off the gas, it would die. Had it cleaned and runs like a champ now.
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Unread 10-06-2004, 09:16 AM   #7
ISLANDSURFER
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I had the same exact problem with same exact Jeep... Took it to the dealer to figure it out because I heard it could have been many things but come to find out the service people told me my battery shorted.. They explained to me that the starter only needs a very little amount of juice to start but the because the battery was bad, the computer would act up... So, check you battery..
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Unread 12-10-2013, 08:30 PM   #8
Kristina203
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96 Grand Cherokee dies when i start it if i let off the gas.

Hey yall, so i have a 1996 Grand cherokee limited. And my dad and everybody is used to working on Chevys so we aren't really sure what is going on. I try and start it and in order for it to start i have to keep pressing on the gas, once i let off the gas it just dies. I know its not electrical. Does anybody know the Real solution to this problem??
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Unread 12-10-2013, 09:13 PM   #9
chris87xj
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Welcome to the forum.
All of the above are proven solutions to the problem.
Which one is right for you depends on what's causing this problem for your jeep, but at least now you've got a good idea of some basic things to check to figure out what your jeep needs.
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Unread 12-10-2013, 10:04 PM   #10
Paradise XJ
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Quote:
Originally Posted by Kristina203 View Post
Hey yall, so i have a 1996 Grand cherokee limited. And my dad and everybody is used to working on Chevys so we aren't really sure what is going on. I try and start it and in order for it to start i have to keep pressing on the gas, once i let off the gas it just dies. I know its not electrical. Does anybody know the Real solution to this problem??
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Unread 12-10-2013, 10:06 PM   #11
chris87xj
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Be nice. At least she went to the effort to search out some info relevant to her jeep's situation.
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Unread 12-10-2013, 10:31 PM   #12
Paradise XJ
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OK, I'll shut up!!

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Unread 12-10-2013, 10:34 PM   #13
uberxj92
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This holds true for most all vehicles with ecm. The ecm requires no less than 10 volts to operate correctly. So that leads to power.
1: clean battery cables
2: load test battery
3: most batteries are only good for 2-5 years depending in usage and demographic.
4: test alternator
5: make sure everything is off when you start. A/c lights stereos etc...
6: when you buy a battery make them load test it right there before you pay. Parts stores are infamous for retagging batteries that have sat beyond shelf life. Walmart doesn't do that.
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Unread 12-10-2013, 10:39 PM   #14
uberxj92
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Just to get this out there...
By pressing the gas pedal on an efi vehicle to start it. You're actually forcing the ecm to advance the timing. Essentially bypassing the problem that's nit allowing a normal start. This isn't a bad thing but it shouldn't be done all if the time.
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Unread 12-11-2013, 05:37 AM   #15
green97xjsport
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Your first 2 responses probably hit the nail on the head, just bought mine a few days ago with the exact same problem, had a bad battery with crappy cables and a loose connection to the battery and was throwing iac codes, replaced both, problem gone, and no more codes.
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