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Discussion Starter · #1 ·
I have seen several posts about the different cylinder misfires, but have yet to figure mine out.. It's at the dealer now to figure it out, but i was hoping to get some suggestions or ideas of possible issues before falling victim to a dealer servicing that is not necessary or does not fix the problem.

History - I ordered truck from factory new April 2012, only owner. All recommended maintenance has been performed as scheduled from tire rotations, to oil changes, etc.. Up until now its been a really good truck and only issues have been the dreaded POS bolts on the exhaust manifolds replaced twice per side due to tick and breakage, and of course the molded hinge clips on ram box lids breaking due to poor design. Both of those are items i can live with and get repaired and move on. Truck now has 90,000 miles on it, started at 4 when i picked it up from dealer new.

However this Cylinder 3 (Code P0303) misfire is driving me nuts. It started all of a sudden while driving one day. Felt like i was running over the rumble strips on the side of the road while coming up a hill. I thought maybe it was bad gas (since i got about a half a tank at a gas station i had not been to before) but after draining the tank and running a fuel dryer through it along with a few tanks of premium fuel from my standard gas station, the miss was still there and progressively getting worse. I could now notice it on flat roads and while normal acceleration instead of just under a load or up a hill.
1st trip to dealer was suggestion to replace plugs and coil on cylinder 3 and reset codes. - Done, no change. Spark Plug gap and all checked also prior to plug install. Plugs that came out didn't look too bad, a little carbon but not much.
2nd trip to dealer was suggested to clean throttle body, replace plugs again and now a fuel injector on cylinder 3. That also was performed and no change in misifre. These plugs were absolutely covered in black carbon, and less than week old and maybe 200 miles or less.
3rd trip to dealer is where we are today, sitting and waiting for their answer again as to what needs fixed, my only hope is that this time it's under warranty because so far all has been considered "normal wear items" and not covered.

Cylinder 3 misfire is only code that ever trips or shows up, no other codes or info appears when scanned for problems.

What i have done before going to dealer -
Compression test of #3 cylinder and cylinder ahead and behind it - all just under 180. This was DRY test results and not WET compression test. When plugs removed the 90,000 mile plugs didn't look bad, but cylinder 3 plugs again covered in black carbon and only about 100 miles on them at this point.

Vacuum test showed needle slowly climbing and falling between 18.5 and 19.5. No fluttering or ticking motion of needle just a gradual increase then decrease from 18.5 to 19.5 that took about 90 seconds to complete this cycle of rise and fall.

Power Balance tests shows every other cylinder makes engine idle rougher when coil pack disengaged, except #3 which has no change in idle when disengaged.

Checking electrical for coil on #3 - Had power to number 2 pin of connector when ignition switched on, and pulse on number 1 pin when cranking engine.

Injector harness also had electrical pulse when needed and tested.

my only thought is faulty valve spring or lifter type situation, but i am not a mechanic by any means and have not taken the valve covers off to look at any other drivetrain components.

Engine does have tick when idling, but dealer swears its the "normal HEMI tick", however to me it sounds louder than the standard fuel injector type tick. The tick has slowly become louder over time since about 40,000 miles when first set of exhaust manifold bolts were replaced on recall. It is loud enough to hear from 60+ feet away when idling and not just audible when standing next to truck. It is a tick noise though, not a clunk, grind, or rod knocking type sound.

So this is where i'm at, and hopefully a few suggestions my way will be helpful in not getting myself taken by the dealer on unnecessary repair or missing a necessary repair. And thanks everyone for reading this long posts.
 

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I have seen several posts about the different cylinder misfires, but have yet to figure mine out.. It's at the dealer now to figure it out, but i was hoping to get some suggestions or ideas of possible issues before falling victim to a dealer servicing that is not necessary or does not fix the problem.

History - I ordered truck from factory new April 2012, only owner. All recommended maintenance has been performed as scheduled from tire rotations, to oil changes, etc.. Up until now its been a really good truck and only issues have been the dreaded POS bolts on the exhaust manifolds replaced twice per side due to tick and breakage, and of course the molded hinge clips on ram box lids breaking due to poor design. Both of those are items i can live with and get repaired and move on. Truck now has 90,000 miles on it, started at 4 when i picked it up from dealer new.

However this Cylinder 3 (Code P0303) misfire is driving me nuts. It started all of a sudden while driving one day. Felt like i was running over the rumble strips on the side of the road while coming up a hill. I thought maybe it was bad gas (since i got about a half a tank at a gas station i had not been to before) but after draining the tank and running a fuel dryer through it along with a few tanks of premium fuel from my standard gas station, the miss was still there and progressively getting worse. I could now notice it on flat roads and while normal acceleration instead of just under a load or up a hill.
1st trip to dealer was suggestion to replace plugs and coil on cylinder 3 and reset codes. - Done, no change. Spark Plug gap and all checked also prior to plug install. Plugs that came out didn't look too bad, a little carbon but not much.
2nd trip to dealer was suggested to clean throttle body, replace plugs again and now a fuel injector on cylinder 3. That also was performed and no change in misifre. These plugs were absolutely covered in black carbon, and less than week old and maybe 200 miles or less.
3rd trip to dealer is where we are today, sitting and waiting for their answer again as to what needs fixed, my only hope is that this time it's under warranty because so far all has been considered "normal wear items" and not covered.

Cylinder 3 misfire is only code that ever trips or shows up, no other codes or info appears when scanned for problems.

What i have done before going to dealer -
Compression test of #3 cylinder and cylinder ahead and behind it - all just under 180. This was DRY test results and not WET compression test. When plugs removed the 90,000 mile plugs didn't look bad, but cylinder 3 plugs again covered in black carbon and only about 100 miles on them at this point.

Vacuum test showed needle slowly climbing and falling between 18.5 and 19.5. No fluttering or ticking motion of needle just a gradual increase then decrease from 18.5 to 19.5 that took about 90 seconds to complete this cycle of rise and fall.

Power Balance tests shows every other cylinder makes engine idle rougher when coil pack disengaged, except #3 which has no change in idle when disengaged.

Checking electrical for coil on #3 - Had power to number 2 pin of connector when ignition switched on, and pulse on number 1 pin when cranking engine.

Injector harness also had electrical pulse when needed and tested.

my only thought is faulty valve spring or lifter type situation, but i am not a mechanic by any means and have not taken the valve covers off to look at any other drivetrain components.

Engine does have tick when idling, but dealer swears its the "normal HEMI tick", however to me it sounds louder than the standard fuel injector type tick. The tick has slowly become louder over time since about 40,000 miles when first set of exhaust manifold bolts were replaced on recall. It is loud enough to hear from 60+ feet away when idling and not just audible when standing next to truck. It is a tick noise though, not a clunk, grind, or rod knocking type sound.

So this is where i'm at, and hopefully a few suggestions my way will be helpful in not getting myself taken by the dealer on unnecessary repair or missing a necessary repair. And thanks everyone for reading this long posts.
44fore,

If you do decide to go the dealership route, I'm happy to help. Just let me know.

Kori
Ram Social Care Specialist
 

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Discussion Starter · #4 ·
Well the verdict is in.... had to fire up ole' Faithful (1997 Chevy Z71 with 397,00 miles) and drive her for the next week or so..

Turns out it is going to be 2-3 days to get parts in to dealership and 2-3 days to install said parts.

What was found - Stuck roller on lifter causing excessive cam lobe wear in the #3 cylinder intake. I was told ALL new lifters (not just affected one), New cam, and of course other necessary gaskets/installation materials were ordered and luckily covered under the 100,000 mile warranty. As i visited the dealer to get the news, the mechanic took me to show me the truck with valve covers off and stated after seeing the #3 intake barely moving he knew exactly what it was and has seen it before. His plan is to finish tear down tomorrow to prepare for incoming parts, and at that time will begin a more thorough check of the rest of valvetrain components. And he believed this was the source of my so called "Hemi Tick". lol.

Hopefully that's all it is and in a week or so i'll have her back and road worthy. If anything else comes up i'll keep y'all posted so others can reference the issue if they experience something similar.
 

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very common, roller bearings failed on lifter causing lifter to contact/grind down cam, truck needs cam, lifters, and head gaskets, I do these constantly on all hemi's in all applications, this is even a problem in 3.6 roller/rockers, who ever the vendor is for lifters/rollers is at Chrysler currently absolutely sucks
 

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I just got my 1500 back from the dealer for the exact thing. Loud tick, thought it was exhaust manifold leak. Once they dug a little deeper they found worn cam lobes from seized lifters. Removed and replaced all lifters, camshaft etc.
Luckily warranty covered all of it, but the truck only has 31,000 miles.
Oil changes every 5k (even though 8k recommended).
 

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I just got my 1500 back from the dealer for the exact thing. Loud tick, thought it was exhaust manifold leak. Once they dug a little deeper they found worn cam lobes from seized lifters. Removed and replaced all lifters, camshaft etc.
Luckily warranty covered all of it, but the truck only has 31,000 miles.
Oil changes every 5k (even though 8k recommended).
Wow that is early, most guys with this issue are having it at 120,000+

What is the build date of your truck if you don't mind me asking? It should be on the sticker in the door jamb (not the tread act sticker).


Also, FWIW for those worried about this, you should be able to identify it early with a UOA indicating high iron from the iron being worn off the camshaft
 
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Build date was August 12, 2012.
So fairly late; I was hoping that this would have been isolated to a few years, but it seems that it may be an ongoing issue that we will see popping up in the '13s as they get more mileage on them. I am at higher than average mileage (a couple hundred away from 60,000 miles) so I may get hit early.

I'm about due for an oil change so I will get a UOA and see if there are elevated levels of iron. If there are I guess I'll see what I can do to get it documented so I'm not screwed after the warranty expires. If that's the case I may upgrade to Manley lifters (and pushrods while I'm at it)-they seem well regarded-then tune out MDS since they don't make MDS lifters AFAIK.

ETA: Actually, I thought the annual production re-tool went in July so an August 2012 build should be a 2013. Was it maybe made in 2011? That's the year most of the affected trucks seem to be.
 

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So fairly late; I was hoping that this would have been isolated to a few years, but it seems that it may be an ongoing issue that we will see popping up in the '13s as they get more mileage on them. I am at higher than average mileage (a couple hundred away from 60,000 miles) so I may get hit early.

I'm about due for an oil change so I will get a UOA and see if there are elevated levels of iron. If there are I guess I'll see what I can do to get it documented so I'm not screwed after the warranty expires. If that's the case I may upgrade to Manley lifters (and pushrods while I'm at it)-they seem well regarded-then tune out MDS since they don't make MDS lifters AFAIK.

ETA: Actually, I thought the annual production re-tool went in July so an August 2012 build should be a 2013. Was it maybe made in 2011? That's the year most of the affected trucks seem to be.
have you considered purchasing a lifetime drivetrain warranty?
 

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google chrysler warranty direct. not sure if you still qualify, but it looks like for 2600.00 you can get the lifetime warranty with 100.00. i am skeptical about this but worth looking into.
 

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Well the verdict is in.... had to fire up ole' Faithful (1997 Chevy Z71 with 397,00 miles) and drive her for the next week or so..

Turns out it is going to be 2-3 days to get parts in to dealership and 2-3 days to install said parts.

What was found - Stuck roller on lifter causing excessive cam lobe wear in the #3 cylinder intake. I was told ALL new lifters (not just affected one), New cam, and of course other necessary gaskets/installation materials were ordered and luckily covered under the 100,000 mile warranty. As i visited the dealer to get the news, the mechanic took me to show me the truck with valve covers off and stated after seeing the #3 intake barely moving he knew exactly what it was and has seen it before. His plan is to finish tear down tomorrow to prepare for incoming parts, and at that time will begin a more thorough check of the rest of valvetrain components. And he believed this was the source of my so called "Hemi Tick". lol.

Hopefully that's all it is and in a week or so i'll have her back and road worthy. If anything else comes up i'll keep y'all posted so others can reference the issue if they experience something similar.
Thank you! My 2013 1500 HEMI has the same issue
 

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I am having the same issue but my truck starts shaking like driving on the rumble strips only at 70 mph. I drive it daily around town and have no issues it only happens when I try to get on the highway so you guys think it’s the cam as well like stated above?
 

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I am having the same issue but my truck starts shaking like driving on the rumble strips only at 70 mph. I drive it daily around town and have no issues it only happens when I try to get on the highway so you guys think it’s the cam as well like stated above?
Sounds more like a tire balance issue of wheel berringissue from the way I read your post.
 

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My 2012 is in the shop now hope to have problems covered by my after market warranty I have..was told coils and or plugs bought new had done..same thing..shakes on gaining speed starts hard mpg cut in half only shifts from 1st up to 4th gear and no 5th and 6th..had new coil packs switched around and plug gap checked and still misfire cyl 1 was hoping to hear for sure today what they found but waiting for Monday now I guess..the guy did call and say he thought it was pcm and also a coil is not seated right onto the plugs..(didn't know that was possible) but said he needs a couple more hours to make sure he has the right diagnosis for my warranty company..has 141000 on the clock I'm the second owner all scheduled maint has been done on time..so now I wait for dreaded Monday to find out anything else..do most warranties cover the pcm or is that out of pocket..seen they go for around 800 to 900 bucks new?
 

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Hi everyone, I’m currently going through some of the same issues that others have stated in the thread. Luckily the few that have had the more complex issues have been under warranty and I was curious if anyone has had to pay out of pocket? If the price would be too great at what point would it be time to start thinking about a new vehicle. Thanks for any info on the subject
 

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Hello everyone, 2016 Dodge Ram Big Horn 6 cyl. Just had this issue come up yesterday. All of a sudden felt like driving on rumble strips and the stuttering. Backed off and it went away, went to pass and it started again and got the check engine light. Thought bad gas like everyone else but took it in for a code read today and its the misfire cylinder 3 code. My 2016 has 132,000 miles on it and out of warranty. From those of you who have had the work done could I get a heads up on $$$
 
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