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  #1  
Old 04-04-2010, 10:56 AM
1liter 1liter is offline
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Default 03 1500 hemi po300 code

I was towing a car the other night in a heavy rain going 75MPH or so and the truck started to shake realy bad I was thinking a Ujoint right off the bat but I was over a hour from home so I slowed down and shut off the OD and this raised the RPMs witch made it shake less witch was great till I had to get off the highway then the truck did not want to stay running I made it home by pumping the gas pedel at the red lights still no Check engine light till I pulled in my drive way itsays bank1 to rich and missfire #7. I pulled the plugs they look good gap and all I swaped the #7 coil out with one off of one of the other ones on my engine to see if it was the coil but now it says Po300 random misfire truck has a 125000 miles thanks to that can help.
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Old 04-04-2010, 11:02 AM
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What were all the P codes that were originally stored? Did you clear the codes before starting the engine after swapping coils? I'd initially suspect a broken valve spring or bad injector.
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Old 04-04-2010, 11:09 AM
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it had a bank1 to rich and a misfire #7 code and yes I did clear codes after I swaped out the coils.
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Old 04-04-2010, 11:14 AM
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You could try swapping injectors to rule that out. I'm leaning toward a broken valve spring since older Hemi's seem a bit prone to it and you've already checked the plugs and swapped coils.
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Old 04-04-2010, 11:25 AM
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but it is not telling me which #s ones to swap out I was thinking bad gas (I put gas in 30Mins before it started it Shake) so i put in a bottle of isoprople and ran it 20+ minutes with no change
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Old 04-04-2010, 11:42 AM
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Start with #7 since you had a P0307 code first.
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Old 04-04-2010, 12:05 PM
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ok but why would i go from 307 code to the 300 code with only a coil swap? I am thinking I should try to put run sum of the gas out of it and put sum fresh super in it with sum more water remover before I start chasing my tail on this thing I will let you know thanks.
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Old 04-04-2010, 05:24 PM
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well filled the tank with super put 60Miles on it on the Hwy and it runs great if you floor it but under 2500rpm it skips when I got home I pluged in the scaner and it had 5 codes. (P0172 Bank 1 Rich) (Po202 Injector #2 Mal) (PO205 Injector#5 Mal Code twice) (Po207 Injector Mal #7 Code Twice) (PO300 Randum misfire) I will start with Fuel Presure Test what do you guy think?
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Old 04-07-2010, 08:14 PM
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nodody has any ideas??
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Old 04-07-2010, 08:19 PM
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Just bumping. How was the fuel pressure test?
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