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Old 01-09-2013, 02:20 PM
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Starts, but dies without fuel

I just replaced my right headlamp. Other than that, no problems before today.

When I turn the key, the engine will turn over but won't start. Battery meter shows 9 V. It will start if I give it gas while turning the key, and will remaning running as long as I leave my foot on the gas, but dies as soon as I take it off. At least 1/4 tank left on the gauge.

I ran it in neutral for about 2 minutes with my foot on the gas, thinking the battery needed some juice, but no dice.

Any suggestions? This just happened, so I'm going to go do so Googling and see what I can find.
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Old 01-09-2013, 02:22 PM   #2
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When was the last time you cleaned your Throttle body and IAC sensor?

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Old 01-09-2013, 02:26 PM
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Quote:
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When was the last time you cleaned your Throttle body and IAC sensor?
I never have. And I've had the jeep almost 3 years now.
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Old 01-09-2013, 02:37 PM
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Here's a few posts with similar symptoms. Going to try some trouble shooting now:

http://www.wranglerforum.com/f5/99-4...in-195646.html
http://www.wranglerforum.com/f5/99-t...ies-57116.html
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Old 01-09-2013, 03:02 PM   #5
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The engine won't run or idle if the battery is too dead. Does it crank normally when you try to start it or does it crank slow or do you need to jump start it?
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Old 01-09-2013, 03:20 PM
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The engine won't run or idle if the battery is too dead. Does it crank normally when you try to start it or does it crank slow or do you need to jump start it?
It cranks slow (much like a dead battery). It will only start if my foot is on the gas.
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Old 01-09-2013, 03:48 PM
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Just went out and ran it for about 5 minutes at 2k RPM. As soon as I took my foot of the gas, it died. Battery meter was at 14V while running, dropped to 12V afterwards.

I have a grey-headed key, and the Sentry Security System light does not blink. I don't notice any difference from prior behavior with that light (that doesn't mean that I'm not just blind).

Next, I tried to get some error codes, but I don't think there were any. The odometer went through each digit (all 0's to all 9's), then displayed the mileage. No firmware version or error codes. I tried twice. The gauges and lights did a cool little show and dance.

Off to check my battery cable connectors next.
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Old 01-09-2013, 04:08 PM
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Just tried to remove a battery connector, and it's good and stuck on there. Headed to the auto parts store for a scrubber and cleaner.
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Old 01-09-2013, 05:36 PM
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Just tried to remove a battery connector, and it's good and stuck on there. Headed to the auto parts store for a scrubber and cleaner.
Thanks to Jerry and Dex for your suggestions.

The battery clearer and scrub cost about $8 at the store, and after following the directions on the can, she started right up and worked like a charm.

I looked at the throttle body, and it looked surprising clean (for not having been cleaned in 3 years, and 60K miles). Is it worth taking apart and cleaning even if it appears spotless from the outside?


Throttle Body Closed (No Flash) by andrewgl1, on Flickr


Throttle Body, Inside (Flash) by andrewgl1, on Flickr
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Old 01-09-2013, 06:38 PM   #10
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As you can see its just 4 bolts to pop it off then you can douche it with Throttle body cleaner. The sensors that are on it (like the IAC) will probably be pretty dirty. I'd clean it.

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Old 01-09-2013, 06:44 PM   #11
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Personally, I wouldn't bother removing the throttle body to clean it. A throttle body is really not much more than a hollow duct with a butterfly valve on the top & a few ports for sensors. I would remove the IAC & clean its plunger and the oriface in the throttle body that the IAC's plunger fits into. Then after resinstalling the IAC, I'd start the engine and while keeping the RPMs up, I'd just start spraying the TB's interior with TB cleaner. I first spray the back side of the butterfly valve with cleaner & wipe it with a rag. Once the can is empty, it should be fine. The IAC would be my #1 priority, only a couple small torx-screws hold it in place, T-25 IIRC.
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Old 01-09-2013, 07:50 PM   #12
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Quote:
Originally Posted by GatorInNola

It cranks slow (much like a dead battery). It will only start if my foot is on the gas.
Mine did that same thing last week, drove to auto parts store with one foot on the gas one foot on the brake and got a new battery. No problems since.

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