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Unread 09-26-2013, 04:36 PM   #1
thavillain
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2002 KJ Liberty 
 
Join Date: Sep 2013
Location: Sacramento, CA
Posts: 6
First Post...2002 Jeep Liberty Limited

Hey all...new to the forum, and 1st time Jeep owner.

I bought a 2002 Jeep Liberty Limited edition about 3 months ago from a dealership.

At the time of purchase, it only had 69,000 miles on it. It is completely stock from as far I can tell, aside from maybe a moon roof and 6 disc cd changer.

An issue started about a month, where the car would not start. It would turn over, the rpm's would jump up then immediately drop to 0 and the car would die. The first time this happened, I had to let the car sit for about 30 minutes and then it started right up, no problem.

This issue is completely intermittent, and will start with no issues some times and others not. If I rev the gas, it will stay running and if I quickly jump it into drive and hit the gas...it will stay running.

I've had the battery tested, it was ok...the Auto parts store guy, said maybe Alternator was jumping around, but I've read a few other places about clogged fuel lines, or IAC is dirty...

Unfortunately my limited warranty from the dealership has expired...need some cost economical ideas...

Plus...I'm not very car handy...

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Unread 09-26-2013, 05:23 PM   #2
tjkj2002
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2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
Posts: 8,140
Just because the battery tests good does not mean the battery is actually good.That would be the 1st thing I'd replace.The alternator is controlled by the PCM(voltage regulator is inside the PCM) so it is rare for a alternator to actually go bad in a gas KJ,it happens but not often.I've seen more cases of bad PCM's then bad alternators.
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Unread 09-26-2013, 05:54 PM   #3
thavillain
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2002 KJ Liberty 
 
Join Date: Sep 2013
Location: Sacramento, CA
Posts: 6
Is there a way I can test the battery without buying a new one?
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Unread 09-26-2013, 07:54 PM   #4
WheelinKJ
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2003 KJ Liberty 
 
Join Date: Aug 2013
Location: Dartmouth, Nova Scotia
Posts: 66
This sounds exactly like a bad fuel pump relay. It will be located in the power center under the hood in front of the battery. Switch it out with a new one or steal one from a parts jeep and you should be good to go.

If you don't want to buy a new one until you're sure, you may be able to switch the relay with one for something less important. Glancing at the service manual, the AC clutch relay, looks to be interchangeable with the fuel pump relay. Drive it like that for a while and if the problem doesn't return you know you had a bad relay.
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Unread 09-28-2013, 05:53 AM   #5
Billwill
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2002 KJ Liberty 
 
Join Date: Jul 2007
Location: South Africa
Posts: 1,036
Quote:
Originally Posted by thavillain View Post
Is there a way I can test the battery without buying a new one?

Buy yourself a cheap Digital Multimeter....you do not need an expensive totally accurate one.

With the meter set to DC volts put it across the terminals of the battery...with Jeep of it should read about 12.5 volts.

As you start the Jeep the voltage must not drop below about 10 volts and then while the engine is at idle the voltage should shoe about 13.5 volts.

This generally shows a good battery but make sure the battery connections are clean and tight, the negative battery lead where it attaches to the chassis is clean and tight and the earthing strap grounding the engine to the chassis id clean and tight both ends.

As stated, swap the Fuel Relay over with an identical one next to it, make sure fuel filter is clean. Also swap out the ASD relay with another one.

You need to get some codes read out to see what it is complaining about...a bad crank sensor or a bad cam sensor often causes this problem...a code reading should point this out.
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