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Unread 06-02-2013, 03:48 PM   #1
JL2002
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2002 KJ Liberty 
 
Join Date: May 2013
Location: Tulsa, OK
Posts: 6
Fuel problems with '02 Liberty

My problem started with putting gas in at Quicktrip. I went to start it, and it wouldn't start. When I finally got it to start it wouldn't stay started and while it was started the valves were clattering pretty bad. I got it home, and was going to replace throttle position sensor, but when I was taking parts off, I noticed that the map sensor was broke. I changed that instead, thinking that because it was broke that was my problem. It started and ran, so I took it out for a test drive. It has a rough idle, and when I accelerate it cuts out, but doesn't die. The fuel pump was changed last year, I replaced the plugs yesterday. Any ideas on what could be the problem? I appreciate any input.

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Unread 06-02-2013, 05:07 PM   #2
streetglideok
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2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,346
Did you change the plugs before or after this event? People frequently put the autozone pushed bosch garbage in them, and that causes plenty of issues alone. Quicktrip is normally very good on their fuel, but I've heard one situation in Tulsa where a delivery was messed up, the tanker driver dropped diesel into a gas tank. Any codes stored? What is your fuel pressure running? Even though your pump was changed last year, it can still be bad. If you had a shop that uses substandard parts, like airtex pumps, etc, that can be a problem too. For some unknown reason, fuel pumps love to die when the tank gets filled. If it was bad gas, it would have ran initially, as it still had good fuel in the lines and fuel rail.

Former ttown resident here.
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Unread 06-02-2013, 07:37 PM   #3
JL2002
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2002 KJ Liberty 
 
Join Date: May 2013
Location: Tulsa, OK
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The plugs were changed after, and I bought autolight double platinum spark plugs. We've always bought qt gas and never had any issues. I will check the other things you mentioned. I've thought about the fuel pump going bad, even after a year. Thanks for the suggestions.
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Unread 06-03-2013, 06:51 AM   #4
streetglideok
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2005 KJ Liberty 
 
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Location: Colorado Springs, Colorado
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Doesn't help you put the wrong plugs in it either. Your engine calls for copper NGK plugs, not double platinum. The differences in how much kv it takes to jump the gap will lead to a weaker spark vs copper. Plenty of known running issues using platinum in place of copper plugs amongst the professionals.
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Unread 06-03-2013, 01:41 PM   #5
JL2002
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2002 KJ Liberty 
 
Join Date: May 2013
Location: Tulsa, OK
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I wasn't aware of that. The guy at autozone said the copper were the cheapest they had, but we could always use a better one, like the double platinum.Thanks for the heads up.
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Unread 06-03-2013, 09:22 PM   #6
streetglideok
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Rule #1, do not buy at autozone. Rule #2, refer to rule #1. Never listen to the idgets at autozone. Its like going to Mcdonalds, and asking the drive thru gal how to smoke babyback ribs. Different types of plugs have different uses, and one type isn't better than all others in all cases. Today I had a ford explorer come in, that somebody threw champion copper plugs in, and gapped them to the ford spec. Problem is, that 0.052" gap is fine for double platinum plugs, but not for copper. Guess how well it ran when it came in, and how well it ran when it went out? If in doubt come on here and ask. Lot more expertise here than all autozones combined.
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Unread 06-03-2013, 10:12 PM   #7
JL2002
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Location: Tulsa, OK
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Makes sense. Back to get the right plugs this weekend and hopefully that fixes her up!
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Unread 06-03-2013, 10:16 PM   #8
JL2002
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Where should I buy the NGK plugs?
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Unread 06-04-2013, 07:05 AM   #9
streetglideok
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Oreillys, Napa, would be a couple of places I'd recommend. Oreillys at 46th and memorial is the hub store and has the most complete inventory btw.
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