Yet another P0305 Cylinder 5 Misfire Problem, Ram 1500 Hemi
 

Hi Folks,
Like many other, I have the cylinder 5 misfire problem. I have run out of ideas. Here is what I have done:
1. Replaced Cylinder 5 Spark plugs
2. Replaced Cylinder 5 Coil Pack
3. Swapped Cylinder 1 and 5 Coil packs
4. Swapped Cylinder 1 and 5 Fuel Injectors
5. Replaced Cylinder 5 spark plugs with premium type
6. Scoped both cylinder 5 spark plug holes for deformities or leaked oil from valve cover gasket (none found)
7. Did a compression check on Cylinder 5. It was around 200, which in my opinion is great.

This is on a 2012 Dodge Ram Laramie Longhorn with the 5.7 Hemi.

Anyone got any other ideas on what I can try next ?

Thank You,

Eric

Put a noid light on the injector connector, and verify it is flashing reliably. Do the same for the coil connector...... see which one is erratic.

Hi,
A noid light ? What is that ?

Also, he error code isn't a hard error. It takes several minutes of driving to appear.

Thanks,
Eric

Sounds like a mechanical issue rather the the electrical stuff you've pretty much eliminated. Flat lobes or broken lifters will throw codes and you can still have good compression.

Diagnostic tool. :) Parts stores will know what you are asking for.

Cam shaft and lifters is what I am afraid of. If I pull the valve cover, can I pull the push rods and lifters
and inspect the camshaft ?

Also, I'm pretty sure that there is a timing sensor that is the basis for the fault code, in that the computer
can sense the minor timing differences and determine what cylinder isn't firing. Where is that sensor located ?

Thank You,

Eric

I think the dealer can diagnose with the valve covers off. Unfortunately, to get to the lifters, the heads need to come off.

Wow, you would think the lifters would lift out with a magnet....

One thing I haven't tested is for intake leaks. I'm going to try that and repost.

Thanks,
Eric

Silly question but is the truck running bad? The reason I ask is because I had a similar issue P0303 code that would come and go for about a year. The truck ran fine but the stupid light kept coming on for a couple days then it would go off for a couple days. I did all the things you did plus had my cam, lifters, and sensor changed and I still got the light. I know this is going to sound stupid but I had a bad puddle light on my drivers side mirror (it would come on sometimes, others not) and I finally changed that light and I haven't got another check engine light (P0303 code) since. You might look around and see if you have any bad lights on your truck, I am certain that mine was an electrical problem. If your truck is running bad ignore everything I just said!

It intermittently idles bad and sometimes when I punch it, I hear a backfire. So its intermittently running bad.
Because of the time change, I don't have enough daylight when I get out of work to troubleshoot.

This weekend I'm going to check for intake leaks and then if that doesn't pan out, I'm going to pull the
valve cover and see what is going on.

Thanks,

Eric

I had the same issue on my 03 Durango 4.7 kept ****ting #5 no matter what I was doing after tons of research and talking to some gurus about it I changed the crankshaft position sensor and everything started working like normal

Sorry, I forgot to closeout this thread... It ended up being that the exhaust valve seat was dropping and wouldn't let the
valve close all the way. I was able to discover this by pulling the valve cover and having someone cranking the engine.
You could see the rocker was not moving as far as the others.
Ended up having to pull the heads, it was a major disassemble to replace them. If your going to replace the heads,
get aftermarket exhaust stud/bolts and make sure your machine shop guy peens the edge of he valve seats to keep them
from working there way out.

2015 Outdoorsman #5 missfire
 

I have the same problem.

First visit to dealer they replaced lifters, then the head. Seemed to work great for almost a year.

Second visit to dealer lifters, now head still producing same errors, they have had for 2 months.

Hoping for new power pack, we will see.

Frustrated.

Hi tmeak,

Your vehicle has been at the dealer for 2 months? Would you mind sending me a direct message so that I can escalate your inquiry.

Jasmine
Dodge Social Care Specialist

Cylinder 5 misfire = lifter/camshaft failure.
 

I hope your re-power is successful.
My 2015 has been at the dealership for a month now, waiting for parts. Lifter/camshaft failure. I hope it doesn’t take another month. That would be most aggravating. I’m driving a minivan while I wait and I’m not enjoying it.

Good Luck

Hi Diesel McNasty,

I am sorry to hear you've been in service for a month. Is there a case created on the customer care side in an effort to expedite the process? Send me a direct message as we'd be glad to help.

Jasmine
Dodge Social Care Specialist

Had the same thing replaced plugs and coil pack. took a trip to the dealer, $350.00 got a quote to replace the drivers side cam and lifters due to the cam going bad $4200.00. Might be the last dodge I own. 146000 miles and a cam goes bad. My 99 ram drove for 360000 never had a problem.

Funny Dodge is doing nothing with all the reported cam failures on the internet.

Currently I'm working on my neighbor's 2013 Hemi with right at 100,000 miles that has the p0305 code. It does seem to have a tick on the drivers side. Last night while driving it slow it almost seemed like a loud diesel clang this went away with higher rpm. So far the spark plugs have been replaced. Coils swapped. Injectors were pulled and ultra sonically cleaned and tested. It seems to run ok until hard acceleration then it starts to miss and throws the p0305 code. With my scanner I can live stream the injector pulses. Everything looks ok until heavy acceleration then number 5 just goes dead. This seems to last for a minute or two then it will come back to life. The injectors have been swapped also. Any help would be greatly appreciated.

Same problem
 

Have you had any luck isolating the issue? My 2014 ram is doing this exact same thing. Just changed plugs, coil, and the injector. Some hesitation at low speed and light flashes if I get on it. Injector 5. Thanks.

Compression test.

Hello, I know that this is an old thread but I'm trying to figure out why you need to replace a bent valve? Curious on how the valve got bent.

I just bought an used 2016 ram 1500 5.7L, the lifters rattle way way to much for me. I think that its a lifter issue.

Usually valves don't get bent unless something hits them.... like, a piston... which is never a good scene. Of course, on the 5.7, it may just be a dropped valve seat. Pull the heads, see what ya got. (gotta pull 'em anyway to change the lifters.)

I wonder if the valve guide might have stuck a valve. Sure hope its not a failure of the variable valve timing mechanism.

I sure noticed that my 2016 hemi lifters sure rattle more in the newish truck than my 2001 ram 1500 5.2L with 300000 miles on the clock. Such a same. I hate vehicles that make funny engine noises.

Was you able to figure this out My 2012 Ram 5.7 is doing just that.

What did yours end up being? Mine is in the shop now. Same codes, plugs/coils replaced, etc...

im having the same issue with my 2010 rt Callenger. Keeps blowing the coil on cylinder 4 with p0304 and p2311 code

Did you ever get this figured out? Mine is doing just this. Swapped coils, plugs etc… Runs great unless I accelerate hard then light flashes and truck runs terrible for a minute.

I found on my hemi unseated plug at #5 coils I'm finding connections weren't seated in the rear of plug also headlight plug same conditions anyone looking at this, my heart dropped when I heard it to me sounded dead on that cylinder so i ran code uh oh dreaded tick and code shoot I'm probably rebuilding pulled plugs looked nothing weird huh cleared code wife drove Bing dang light back on that coil was getting heat on 5 probably coil right intermitten well as I put it together bingo there it is see the wires look in plug snap it in no more code no clickity clacking seems normal again 😀

Dood, I appreciate your input. I'll definitely try your solution first! But I could barely read or understand your post! I had to sit in my rocking chair, out on my front porch, and read it with a BIG southern accent, a large piece of straw hanging out of my mouth, and my eyes all blurry! lol 😆 No disrespect, just picking fun. Proud southern redneck here!

How did you get 200 psi compression if the valve was not closing all the way?

Did you figure it out?
 

did you figure out the problem?