I changed all my coil packs n plugs n it still keeps on telling me I have a misfire on cylinder number 3 n I change that one twice with new coil packs n plugs n it keeps telling me same thing it's a

50

Asked by Feb 22, 2014 at 06:55 PM about the Dodge Ram 1500

Question type: Maintenance & Repair

2011 dodge ram 1500 5.7 hemi

21 Answers

360

are you changing the boot to?

1 of 1 people found this helpful.
115,035

Could also be faulty fuel injector for that cylinder. Might try some sea foam in your gas tank. This will clean your injectors.

4 of 4 people found this helpful.
115,035

http://www.obd-codes.com/p0303

3 of 3 people found this helpful.
70,895

Dandy's right, check the fuel injector for cylinder number 3. If it checks ok, compression test that cylinder. Could be a valve problem. HTH. -Jim

1 of 1 people found this helpful.
50

Where is valve located at?i don't know nothing about trucks n thanks for the help guys

1 of 1 people found this helpful.
70,895

The valves are located in the head. HTH. -Jim

115,035

The valve is an internal part of the head. Not something you can see without tearing the head apart. I do not advise that. But having a compression test done will tell you if it's operating properly and is not that hard to preform.

2 of 2 people found this helpful.
50

How do u do a compression test ?

4 of 4 people found this helpful.
115,035

http://www.popularmechanics.com/cars/how-to/maintenance/cars-101- how-to-do-a-compression-test-14912158 -- check this out

4 of 4 people found this helpful.
52,595

Swap the #3 fuel injector with another one on the engine to see if the miss moves with the fuel injector. Putting Seafoam in the tank will not clean an injector that is not passing fuel. When you get it fixed run some Chevron Techron fuel system cleaner once or twice between oil changes to help keep the fuel system clean.

3 of 3 people found this helpful.

Did any of these awnsers resolve your issues?

Hey did all of those things you said even went as far as new head still having same thing rule pressure test and new intake gasket still miss fireing any one with good ideas for me any thing would help thankyou

Sorry got nothing but wires left to try

10

I put brand new mad blaster coils new plugs new Taylor shorty wires still had a miss on#2 pulled plugs on #2 they never had fired. Put my old plug wire on That fixed it I got a bad new wire now Got to find out if they will make it good I mention MSD coils

1 of 1 people found this helpful.
52,595

It would be much less confusing if you other people with issues started your own question in a new thread.

1 of 1 people found this helpful.
52,595

Something else that may be useful in your search for the elusive miss is a compression test. It is possible that a valve spring could be broken or a pushrod be bent or something else in the valve train be in need of repair.

1 of 1 people found this helpful.
70,895

Amen, Bob!! After all this thread IS 3 years old!! Geeze!! -Jim

52,595

Yup, it started a long time ago and people really wrongfully added to it.

1 of 1 people found this helpful.
60

I'm having the same issues with my 07 Dodge Ram 5.7. I checked fuel psi and vaccum tested all was good so that eliminates compression and fuel. I was originally getting p0304 and0300 codes since then it's now 0303 and 0300 shortly after start up,all the time!

60

I've reset the pcm and swapped coils with#1 same issue but once I delete the codes with my code reader all is great til I stop somewhere and shut off the engine for a few minutes. Stupido Dodge computer.

Just adding my experience to this thread. 2011 ram hemi. One of the lifters seized up, and ground down the lobe on the camshaft. I've read elsewhere this is a common issue with this engine. $4,000 bill.

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