hemi won't start/run
New Member
Joined: Sep 2012
Posts: 1
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Issues with cylinder 6
@dodgeforum.com I have a 2004 Dodge Ram 1500 5.7 Hemi, cylinder 6 was misfiring on me so i checked the coils and all were good so i pulled the plugs, there was no gap in them anymore so i put 2 new ones in. Ran good for about 70 miles and started missing again. checked the plugs and the same thing happened. Would this be from a build up of carbon on the piston thats hitting the plugs? And if so why on JUST cylinder 6? Compression was at 75 but the book does not tell me what it should be at. Any help would be appreciated.
Record Breaker
Joined: Jul 2012
Posts: 1,519
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It just seems like the way it's running, that it would be the computer. If 1 cylinder is out, I don't think it would make it run like it is. It's running like it's running on bad gas. But, I forgot to mention that when I was checking stuff before, a message popped up on my dash. It said "buss error". This came up after I first connected the code reader up at the beginning, because the engine light came on. The code reader picked up a generic code, P0300. When I looked it up on the internet it had a list. A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer
I've changed the plugs, cam sensor, crank sensor, upstream o2 sensor. There isn't any EGR valve. The funny thing is, it was running fine. When it died, I was coasting maybe 5mph in the parking lot at work about 50 feet from my parking spot. It just started spittin & chuggin & that was it.
The only thing left to check is the catalytic converter & the computer. I checked everything else. Does a repair garage have the equipment to check the computer? Or is that a dealer thing to do?
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer
I've changed the plugs, cam sensor, crank sensor, upstream o2 sensor. There isn't any EGR valve. The funny thing is, it was running fine. When it died, I was coasting maybe 5mph in the parking lot at work about 50 feet from my parking spot. It just started spittin & chuggin & that was it.
The only thing left to check is the catalytic converter & the computer. I checked everything else. Does a repair garage have the equipment to check the computer? Or is that a dealer thing to do?
Champion
Joined: Aug 2006
Posts: 4,489
Likes: 4
From: New Jersey
Well just to be safe I'd spend the money to get the leakdown and compression test done before you dump that kinda (non-refundable) money down the drain for a new computer....
If he got the buss code error it could be both a bad TIPM and Computer...
But I would still run the tests, shouldn't cost you more than $150 at a good shop... or $50 if you do it yourself....
If he got the buss code error it could be both a bad TIPM and Computer...
But I would still run the tests, shouldn't cost you more than $150 at a good shop... or $50 if you do it yourself....