1999 4.0l starts but won't continue to run without gas peddle assist. - JeepForum.com
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Unread 10-22-2008, 07:55 AM   #1
gyurko
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1999 4.0l starts but won't continue to run without gas peddle assist.

My 1999 4.0L with 83K. has started to episodically fail to start without gas being depressed and will not idle without gas feed help. Without gas feed being depressed it will stall. After driving a few minuets it will run normally and start normally until it occurs again. No fault codes come up. Appreciate any suggestions or similar experiences and solutions. Thanks.

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Unread 10-22-2008, 08:35 AM   #2
96cherokeeclass
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Quote:
Originally Posted by gyurko View Post
My 1999 4.0L with 83K. has started to episodically fail to start without gas being depressed and will not idle without gas feed help. Without gas feed being depressed it will stall. After driving a few minuets it will run normally and start normally until it occurs again. No fault codes come up. Appreciate any suggestions or similar experiences and solutions. Thanks.
same thing happened to me... believe it or not a new battery fixed it
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Unread 10-22-2008, 09:03 AM   #3
CJ7-Tim
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Those are the common symptoms of a bad battery. Take it to a repair shop or parts store and have it load tested.
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Unread 10-22-2008, 09:05 AM   #4
bwoo90
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Could be bad gas, could be a TPS, could be alternator going, might try cleaning the IAC.
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Unread 10-22-2008, 09:07 AM   #5
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It's a bad IAC trust me. This happened to me on my mustang. It would start sometime without an issue, other times I had to keep my foot on the gas to keep it from dying. After driving it for a few minutes it would idle fine. I replaced my IAC and all is good.
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Unread 10-22-2008, 09:23 AM   #6
96cherokeeclass
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Start with the simplest solution and work your way up
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Unread 10-22-2008, 09:28 AM   #7
Cherokee2000
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Happened to me twice. Both times it was because my battery was near dead. If your battery is still good, then X3 on your IAC.
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Unread 10-22-2008, 10:18 AM   #8
tjwalker
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Testing is best way to figure this one out. Start with battery, then TPS IMHO.
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Unread 10-22-2008, 10:23 AM   #9
kadetklapp
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Unhook the battery and then hook it back up and see what happens. If not then I would guess TPS.
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Unread 10-22-2008, 10:40 AM   #10
jebmccall
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thats happens to me when ever my battery dies i have to help it idle for a few minutes, and then all is good
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Unread 10-30-2008, 08:05 AM   #11
gyurko
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Thanks for all the advice everyone. I discovered that the battery termnals were dirty and cleaned tham up and have driven the vehicle for the past week without a glitch. Never would ahve suspected that the no idle situation could be caused by low battery output.
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Unread 10-30-2008, 09:55 AM   #12
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Thank-you for coming back with a follow-up. All too often we never hear back.
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Unread 10-30-2008, 02:54 PM   #13
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Dang that is kind of weird, good thing to know.
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