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Old 03-01-2011, 07:38 AM
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07 starting issue- give it gas to keep it started?

ive searched a couple forums already this AM, they seem to touch on my problem but not exactly.. ive noticed the past couple times i have went to start my jeep it will start and as soon as it catches and hits 1000rpms it will drop to 500 and catch itself from stalling. i noticed it last night and this morning when i started it to come to work. i stopped at wawa and was hesitant to shut it off but i did. i came out and turned the key, it would catch and the rpms would hit 500 and then it would start. i tried 3 times and on the 3rd time i figured id give it gas as the rpms climbed and it stayed running.

its an 07, 4.7 v8 with just under 62k on it...
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Old 03-01-2011, 10:18 AM
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Re: 07 starting issue- give it gas to keep it started?

hmmm....watching with interest
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Old 03-01-2011, 10:22 AM
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Re: 07 starting issue- give it gas to keep it started?

battery was just replaced less than 6mon ago according to carfax... so im ruling that out.
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Old 03-01-2011, 10:25 AM
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Re: 07 starting issue- give it gas to keep it started?

First thing I would do is remove the TB, perform a thorough cleaning, and see if anything changes. Then I'd probably start with any of the sensors mounted on the TB. TPS, and IAC. No codes being thrown?
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Old 03-01-2011, 10:28 AM
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Re: 07 starting issue- give it gas to keep it started?

check your air filter as well. Something similar happened to a buddy of mine with a 4.7, the air filter was garbage and it actually stalled. replaced the filter and it was good to go...
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Old 03-01-2011, 10:29 AM
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Re: 07 starting issue- give it gas to keep it started?

ill go out at lunch and check the air filter... no codes thrown which surprises me..
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Old 03-01-2011, 10:32 AM
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Re: 07 starting issue- give it gas to keep it started?

How old are the spark plugs?
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Old 03-01-2011, 10:38 AM
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Re: 07 starting issue- give it gas to keep it started?

the first thing I would do is check the gas cap and make sure its tight. .. just a thought.
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Old 03-01-2011, 10:42 AM
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Re: 07 starting issue- give it gas to keep it started?

my 05 laredo has done that to me once all i did was give it gas the second try and let it idle for a minute and gave it gas in park and built up rpms to 2500. might just have shit in the wrong place. I would check the TB though.
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Old 03-01-2011, 12:41 PM
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Re: 07 starting issue- give it gas to keep it started?

so started fine with the remote start at lunch, didnt try the actual key in the ignition- the air filter looks brand new. it still bothers me, as for the spark plug question- it hasnt had the 60k maintenance done but will be done in the next week or so. so im thinking the plugs could def use a change.
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Old 03-01-2011, 01:02 PM
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Re: 07 starting issue- give it gas to keep it started?

Well my liberty did that a while back and I called my uncle (he's a mechanic) and what happened to mine was the battery had died for a while (it was parked) and once I jumped it off, it started running just like you are describing. I was told that when it loses all electrical meaning battery dying or being removed for a extended amount of time the computer has to recalculate its self, but mine did that for about a week and one day I just started it and let it run for around a hour at my house till it fixed itself, and it never did it again. I don't know if this is what happened before yours started acting up, but since it sounded exactly like what mine did, I thought I would through it out there.
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Old 03-01-2011, 03:08 PM
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Re: 07 starting issue- give it gas to keep it started?

Start your car, pop the hood. grab the throttle position sensor firmly (still mounted to the throttle body) and move it around. If your idle wonders around while your putting pressure on the sensor you need a new TPS.

The TPS sensor is SUPER common on the 4.7l. ANY idle concerns that is the first place I look.
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