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  #1  
Old 03-12-2011, 02:05 AM
nick2889 nick2889 is offline
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Default multiple misfire at idle and under acceleration

hey guys,
first post and brand new to this forum. My 02 ram 5.9l has horrible misfire issues as stated in the title. I can feel it mis at idle but its not horrible. From about 1/8 to 1/4 throttle around 1200 to 2100 rpms is all i can drive at or it will start missing like crazy. If i stomp on the pedal it will stall out... It seems that it will run better during the first 5 min of driving (cold engine)

recent parts replaced or added:
Hughes engine plenum repair kit***
plugs
wires
cap and rotor
CAI
thermostat 195


Hughes kit was time consuming but easy.. my stock plenum pan was totally blown and i couldn't find my camera to take pics. It's the worst one I've seen yet. So after I i reinstalled this Hughes kit, i took it out for a test drive and it ran better than ever for 5 min lol(again cold engine). no misfire or anything.. then, BAMMMM, same misfire problem but it was actually worse than ever now.

MIL is on
I have a scan tool for my laptop
codes:
p0300 multiple misfire
p0304 mis cyl 4
p0305 5
p0306 6

The check engine light was actually off after install for the first time since I've owned this truck, but I assume this is due to disconnecting the negative battery connection for 6 hours.
Any help would be greatly appreciated. I'm excited to be a part of the community and thanx for reading
-nick
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  #2  
Old 03-12-2011, 07:14 AM
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Replace your Upsteam O2 sensor. I had the same issue after I installed my Cold air intake. $30 and real easy to install as long as its not rusted too bad. if the upstream doesn't help try the down stream. for $30 bucks a piece I couldn't complain since it was $120 for my wife's car. Let me know how that works.
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Old 03-12-2011, 08:21 AM
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I wouldn't go throwing parts at it until I verified the parts were bad. If the sensors are awitching properly, there's no need to replace them. Does your laptop show live data?
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Old 03-12-2011, 08:27 AM
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if you're able to scan it, then watch what the O2 is actually doing before swapping it. sure, it's cheap and can be a PITA to swap, but i'd still check how it's working. that's just me. currently i don't have money that i can just throw at parts, so i'd verify before i swapped. don't know if you know what to look for but...... if your "scan tool" reads either "rich" or "lean" for awhile, like it's stuck, then i'd take a voltmeter and read the sensor output. (unless your scan tool already does it). watch the volt reading. it should be between .1 and .9. if it's outside that range, it's bad. if the voltage is not moving around like a rabid cat in a dog pound, up n down within the range, it's bad also. it needs to be moving cause the ecm is constantly adjusting the AFR. that's normal.

hope it helps. but if you got the moolah, then just ignore what ihave just posted.
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Old 03-12-2011, 08:37 AM
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Switching should occur over and under a .5V threshold at about the rate of once per second or so for the upstream sensor only. The downstream sensor needs to hover very close to the .5V range.
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Old 03-13-2011, 11:20 AM
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--->Ramtech, I think I know who I'm going to go to when I have problems with my truck... I like the fact that you always have a specific answer with specs! Its people like you that make this community perfect for the do-it-yourselfers. Props to you and thank you!
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Old 03-24-2011, 11:37 PM
nick2889 nick2889 is offline
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sorry i have been away for awhile.. i'll look into this o2 sensor business right away and yes it does have live scanning, but i wasn't sure exactly what i was looking for or what voltage range is normal.. thanx for the help, i'll get back to you guys as soon as possible
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Old 04-22-2011, 02:06 PM
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i've replaced both o2 sensors finally.... upstream first, then down stream a day later.... but still didn't change anything. any ideas?
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Old 04-25-2011, 08:21 PM
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check to see if there is an oil or dirt build up on the air intake temperature sensor. Also you may want to check the MAF. I know this sounds dumb but hows you Air Filter? Just curious. I had a problem with my wife's car and it turned out to be a clogged air filter... a damn squirrel or something built a nice home in the air box... I wasn't very happy.
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Old 08-18-2011, 07:00 AM
ramonator44 ramonator44 is offline
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have you ever replaced spark plugs wires and distributrer cap? do you have a clogged cat maybe?
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