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2004 Liberty P0300 Muti Misfire

This is a discussion on 2004 Liberty P0300 Muti Misfire within the General Discussion forums, part of the Jeep Forum - Jeep Models category!
Is there anyone that can help me out there? I have a 2004 Jeep Liberty with a 3.7 that has ...

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Old 03-04-2015, 09:05 PM   #1 (permalink)
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Join Date: Mar 2015
Name: Mark
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Default 2004 Liberty P0300 Muti Misfire
Is there anyone that can help me out there? I have a 2004 Jeep Liberty with a 3.7 that has a P0300 multiple miss fire condition that is going on right now that is really got me stuck! I have pulled all 6 coils & checked the resistance & they all read 1.0 to 1.1. I have checked the resistance on all of the injectors & they all read between 14.5 & 15. I have replaced all of the plugs. Went to replace fuel filter from Autozone & come to find out that there is not one on this one after dropping the fuel tank & seeing that it has one return & one pickup line. the fuel filter from Autozone had 2 pickup lines from the tank to one supply to the engine. I did a fuel pressure test & I got between 65 & 70 lbs. I then pulled each coil 1 at a time & on cylinders 1,2,3 didn't make a difference on how it ran. I pulled all 3 at the same time & it didn't make a difference. So I replaced the coils & the fuel injectors on 1,2,& 3 & it still runs like crap. I did reset the computer because I read something about if the computer doesn't see voltage on the coil it will shut down that injector. Still no good. It is not backfiring through the throttle body or the exhaust. when it is idling & missing there is no funny sounds. when you idle it up to 2000 RPM's it has a funny little ticking sound that sounds like a pushrod on an old chevy coming loose but, it has overhead cams. The wife went to the gas station & filled up & 20 miles or so down the road is when this all started happening the next day. If it was bad gas why would it only be missing on 1,3 on the drivers side & 2 on the passenger side? Any help would be great. Baffled in Illinois.
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Old 03-26-2015, 04:32 AM   #2 (permalink)
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You should try Jeep Liberty Forum - JeepKJ Country if you haven't yet. Great source for Liberty info!

Welcome to the forum btw!

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