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  #11  
Old 06-16-2013, 10:38 AM
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If you can get yours hands on a scan tool. Autozone may be able to help. Check the O2 sensors. They are usually the first things that create these problems and it's the last thing that people seem to check. After warmed up they should operate in the .7 Volt range. With that mileage they are well over due to go.
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  #12  
Old 06-16-2013, 11:24 AM
colvin224 colvin224 is offline
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I agree, im headed to autozone shortly to get o2 sensor. from what ive read it would most likely be the upstream one (before the cat). When i had autozone read my codes yesterday it only gave p0300, p0301, p0306 & p0308. No codes for the o2 sensors but it sounds like they could be the cause of the misfire. Also just to add, i went about 5 minutes up the road last night to get gas in the truck and of course it ran like crap (im not driving it anymore at all unil its fixed) but when i got home i parked in my driveway and slowly started to push on the gas pedal and once i got above about 1200 rpm it started rapidly backfiring out of the exhaust like a fast popping sound that followed the speed of the engine. hopefully the o2 sensor fixes it, im just about out of probable causes. if that doesnt fix it im going to switch the injectors around. ill post with results later.
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  #13  
Old 06-16-2013, 12:29 PM
Warlock III Warlock III is offline
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I was was speaking from experience relevant to low or no cost diagnostic techniques that are tried and true. It is in no way fishing in a dark lake with a hook and a prayer. THAT would be suggesting that he BUY new plugs, BUY new wires, BUY new injectors. It would appear that the OP (colvin224) had more time than money than he needs to waste in the truck, but needs to get it running correctly.

I did read your second post, and you are correct Tanketh, insofar as what you sounded like. I don't want you to view this as a personal attack but a clarification: There is no fuel filter, there is no rust in a plastic tank.

Misfires in specific cylinders are usually products of a mechanical issue specific to that cylinder. I believe that the OP requested help and then followed up with a request on the best way to clean the injectors other than in in-the-tank cleaners. The OP was requesting a direct reply to an obviously direct question.

In that regard, I don't know of any over the counter (low cost) way to pressurize the system and clean the injectors.

You might be able to decarbonise the engine with Sea Foam but I don't think that's going to do much for the injectors. They actually make it in a spray can now.

This is somewhat of a low cost and minimally timely process:

I have had some luck cleaning the injectors by soaking them, re-installing them, and then bringing the engine up to operating temperature. For time sake it's best to do them one at a time. After reaching operating temperature, shut the engine down, remove the shrader valve from the fuel port to permit the release of fuel pressure.

Be careful hot engine + raw fuel. Get as much Sea-Foam into the fuel rail as possible, and as much fuel out as possible. Re-install the shrader valve in the fuel port and start the engine. This is the best method of delivering direct pressure and un-concentrated cleaner to the inside of the injector to clean it. I usually unhook the coil wire while doing this because you don't necessarily want to start the engine with a large amount of barely un-concentrated Sea-Foam in the engine. You just want to clean the injector(s).

Do it for each cylinder that was misfiring independently (3 times) to attain the best results.

** Disclaimer****When I refer to the "Best method" I am making the presumption that the OP does not have a fuel injector cleaner to pressurize the injector cleaning the inside.

NOTE: As for the 02 sensor(s) mentioned by JWM59 I agree. You can unplug the upstream 02 sensor as a diagnostic procedure and run the vehicle as the vehicle will not detect the variables introduced by a bad 02 sensor. The vehicle should run in limp mode under the factory pre-set parameters deleting the misfire if it is being caused by the faulty 02 sensor. It will merely indicate that you have a bad 02 sensor and not result in a misfire as a result of a faulty signal of the 02 sensor.

Now go buy some bait.

Last edited by Warlock III; 06-16-2013 at 12:57 PM.
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  #14  
Old 06-16-2013, 01:03 PM
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Quote:
Originally Posted by colvin224 View Post
I agree, im headed to autozone shortly to get o2 sensor. from what ive read it would most likely be the upstream one (before the cat). When i had autozone read my codes yesterday it only gave p0300, p0301, p0306 & p0308. No codes for the o2 sensors but it sounds like they could be the cause of the misfire. Also just to add, i went about 5 minutes up the road last night to get gas in the truck and of course it ran like crap (im not driving it anymore at all unil its fixed) but when i got home i parked in my driveway and slowly started to push on the gas pedal and once i got above about 1200 rpm it started rapidly backfiring out of the exhaust like a fast popping sound that followed the speed of the engine. hopefully the o2 sensor fixes it, im just about out of probable causes. if that doesnt fix it im going to switch the injectors around. ill post with results later.
In the short time I had my 05 ram I purchased an Actron code reader and it paid for itself. You can monitor the sensors in real time. Like I said it should be at about .7 volts. Much higher or lower and i'ts time to replace. I had 3 go bad at different times and the truck ran like crap and I could pin point which one went. Gives you fuel trim and temps and other information. Good luck. I'm sure when you get it up and running you will enjoy the truck.
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  #15  
Old 06-16-2013, 02:09 PM
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cant reply to pm due to not enough posts, but thanks for a good laugh !
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  #16  
Old 06-16-2013, 06:23 PM
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no luck with the o2 sensors, just got done switching injectors around and resetting computer. one other thing that i also noticed is that the exhaust gases seem abnormally hot. if i hold my hand in front of tailpipe i can only stand to get my hand about 8 inches away from the opening of the tail pipe because its so hot. maybe im just imagining things, but i figured id mention it.
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  #17  
Old 06-16-2013, 07:16 PM
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Did you check for vacuum leaks on hoses and around intake.
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  #18  
Old 06-16-2013, 07:24 PM
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http://youtu.be/9CPqbaSgcok
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  #19  
Old 06-16-2013, 10:01 PM
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i looked around at what i could see and everything looked ok, no cracked hoses or anything or abnormal sounds. but i will try this, carb cleaner in one hand, fire extingusher in the other haha. also i switched the injectors around and now i cant get the stupid thing to throw a code, its still running like crap though.
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  #20  
Old 06-17-2013, 01:39 AM
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hi i have a 2000 ram 5.9 engine and i have the same problem p0300 p0303 p0304 it idles bad rpms are about 600 i have change almost everything i change spark plugs , wires,iac valve ,intake gasket, temp sensor,check for compression it was 105, clean injectors, and it still running bad today i clean the 02 sensors and same thing how low is yours in rpms?? i am running out of options i check for vacuum leaks and it seems to be ok i am going to keep working on it if i find a solution be sure i will let you know next is the tps sensor good luck with yours
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