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  #1  
Old 11-26-2010, 09:37 PM
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Lightbulb check engine light code, please help interpret!

Hey all,

Just got my trucks check engine light code read by my buddy who had a reader, the code was:

P0304 cylinder 4 misfire

Like i stated in a previous thread the light will be on for something like 2 days and then be off for a whole day randomly its never consistant

i was planning on doing a full on tune up tomorrow including spark plugs, spark plug wires (these will be ordered), oil and filter, radiator fluid, maybe some seafoam or lucas, clean the k&n air filter

what other things should i do to try and fix this problem? is this a common code? any success stories out there? i hope i can try and fix this on my own, but let me know if i can figure out what the problem is or should take it to the shop

looking forward to hearing any input from you all, i am very new to these trucks but not dodge vehicles in general and would say am an amateur when it comes to engines (definitely not expert, but have been wrenchin for a little while now)

thanks!
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Old 11-26-2010, 10:28 PM
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I'd also replace the cap and rotor, the ACCEL products are good, and this is part of a complete tune up. The rest are all good, as well as the idea of doing the seafoam, just do it BEFORE you put all the new stuff in so you don't risk any sooting up of the new gear. The tune up is all pretty straight forward, just remember to label the plug wires or only do one at a time.
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Old 11-27-2010, 03:29 PM
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Make sure you examine the plugs closely, especially the one with the misfire. A plug can tell you alot about how the engine is running. Lay them out in order when you take them out, maybe post up some pics and let the mechanics guide you. Don't forget to clean the throttle body while you're in there: http://ramforumz.com/showthread.php?...+throttle+body. Might also want to check for a plenum gasket leak if you have been using any oil.
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Old 11-27-2010, 03:35 PM
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Quote:
Originally Posted by deanthecrabman View Post
Make sure you examine the plugs closely, especially the one with the misfire. A plug can tell you alot about how the engine is running. Lay them out in order when you take them out, maybe post up some pics and let the mechanics guide you. Don't forget to clean the throttle body while you're in there: http://ramforumz.com/showthread.php?...+throttle+body. Might also want to check for a plenum gasket leak if you have been using any oil.
^^^^ Excellent Advice ^^^^,

You may also want to compression test the cylinders and see if the #4 is consistant with the others or not.
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Old 11-30-2010, 02:36 AM
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ok sweet thanks for the input so far, i am planning on doing the spark plugs, wires, cap and rotor this weekend so i will take pics of the spark plug for you and post them up
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Old 11-30-2010, 02:41 AM
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when was the last time the thermostat, belt(s), & hoses were replaced
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Old 12-01-2010, 02:31 AM
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Quote:
Originally Posted by GTyankee View Post
when was the last time the thermostat, belt(s), & hoses were replaced
no clue, previous owner only put 7000 miles on it in 2 years and really didnt need to do anything... temperature readings have been normal, no overheating issues or smells from the engine...at how many miles are we supposed to change that stuff?
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Old 12-01-2010, 11:15 PM
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Quote:
Originally Posted by GTyankee View Post
when was the last time the thermostat, belt(s), & hoses were replaced
Mine's coming up on 100k, I plan on doing it then as preventative. There's also a bypass hose in there, if you do it, don't forget that one.
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