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Old 12-24-2009, 11:56 PM   #1
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Common stalling problem-any ideas?

This may have been answered in another thread, if so please direct me.

I have a 2001 Sahara with about 85k on it, nothing major has ever been done. The other day I started the car and it struggled a bit like a dead battery or something. The gauges jumped but the car started right away. It idled rough and then stalled. I restarted and it started right up, but died once I took my foot off the gas as if I turned off the key or somethng. It restarted, but the same thing happened. When the car is warmed up it runs fine with no stalling when I remove my foot from the pedal. I've replaced the idle air motor($68) but the problem remains. When it's warmed up, it runs fine. When it's cold, it stalls at idle.

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Old 12-25-2009, 12:10 AM   #2
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It's probably protesting being called a car


Have you checked your grounds, battery voltage, and alternator output? Those would be the first places I'd look. Then I'd start looking at a possible fuel delivery problem. It's not beyond the realm of reason for your fuel pump to be either going out, or the pickup screen getting clogged up. Start simple and progress to harder. Replacig the fuel pump and filter requires dropping the tank. Thankfully that's not THAT hard to do.

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Old 12-25-2009, 02:18 AM   #3
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when you say it started like a dead battery do you mean the starter spun slowly? if thats the case pull the battery terminals off and clean them with a wire brush, if its the original battery or you dont know the last time it was changed it might just be time for a new one. test the voltage of the battery with the jeep off, should be between 11-12v then get the jeep running and warm to the point that it doesnt stall and take a volt meter to the battery again, should be 13-14ish. if its below 11 cold you need a new battery, if its below 13 running you need an alternator, if its above 15 running chances are the battery terminals are dirty. if battery checks out good try "priming" the fuel pump a few times before you start it, meaning turn the key to "on" sit for a few seconds then off then on again for a few seconds then start. jeeps have a check vavle in the fuel system that likes to fail and let the fuel drain out of the lines back into the tank, priming the pump a few times refills the lines and lets the jeep start normally. some people just live with a failed check vavle since it is in the tank but the good news is that its only 5 bolts and 3 hoses to disconnect to drop the tank, takes all of 5-10 min.

also cold stalling can be a sign of a vacuum leak, i cant really offer much help with finding it because i really need the jeep in front of me but the intake manifold gaskets are pretty well known to fail, cant see them being cheap at a shop but its really not that hard of a job to diy but does take some mechanical skill.

check the battery and fuel pump and get back to us.
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Old 12-25-2009, 07:21 PM   #4
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Maybe TPS needs cleaning or throttle body cleaning. That was my issue with losing idle.
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Old 12-26-2009, 03:40 PM   #5
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Still trying

Checked the battery, all was well. Still stalling. I disconnected the TPS and the engine had the same problem - I wonder if the tps is to blame? One nasty backfire though. Also, prior to disconnecting the tps(which I reconnected) the exhaust smelled pretty rich.
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Old 12-26-2009, 03:41 PM   #6
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FYI - I was an old school car mechanic 25 years ago - this stuff is a little new to me.
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Old 12-26-2009, 06:26 PM   #7
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Stalls and runs rough when cold, but fine warm.
Smells rich.

Good symptoms of a vacuum leak. Cold it's not getting enough fuel - air is bypassing the throttle body - vacuum leak/lean cylinders.
Once it warms up the computer takes over and makes the entire system a little richer, runs better.

Smells rich - see above - the vacuum leak mostly affects one or two cylinders - making them lean. The computer senses the extra oxygen in the exhaust (by way of the O2 sensor,) so it richens the entire system, not just the 2 lean ones. Now overall the 2 lean cylinders are fine, but the other 4 are rich.

Ahh, the beauty of the computer that makes things act strange.

Check base gasket, vacuum hoses, brake booster, and manifold gaskets.
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Old 04-06-2012, 09:03 AM   #8
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My 2009 Wrangler was sputtering and even stalled while sitting at a stop light. The first time I took it to the dealer they said no odd codes came up and that nothing was wrong with it. A few months went by and it got worse...especially after my gas went under 1/4 tank. I took it back in and insisted something was wrong, i even bet the service person $10 they wouldn't find it. Guess what, no codes again, but it took the mechanic a few extra steps and they found the issue! It was the fuel sending unit aka Module Level Unit....Part number 68003385AA. Hope this helps someone out there.
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Old 09-21-2013, 06:02 AM   #9
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My 2007 Sahara has stalled twice whilst 'coasting' in normal drive i.e. foot off gas pedeal to make a manouver - everything cut out engine & electrics - otherwise running fine - what could be my problem? Help! damsel in distress!

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