Cylinder 7 misfire 2013 ram 1500 5.7

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Nola_Jack

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I’ve got a 2013 Ram 1500 5.7 Hemi 53,000 miles, throwing up an error code for cylinder 7 misfire, no other codes. It’s idling slightly rough, not noticeable at all unless I’m off the brakes and letting it slowly roll forward, I can see the RPMs barely bouncing, but no other issues at all in terms of performance. I had the plugs changed about 1,000 miles ago when the code first popped up and the gas mileage started dropping, it went away for the 1,000 miles, but just now popped up again.

The assumption in my head is that it was an issue with the plugs initially, which is why it cleared the light and it stayed off for 1k miles. The second assumption in my head is that when they were changed something wasn’t connected securely and has worked itself loose over the last 1,000 miles. Am I completely off base? Any knowledge is greatly appreciated, thanks!
 

Brandon-w

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I'd start by changing #7 plugs sometimes they're crap right out of the box or installer could have accidentally cracked one installing it. Check connections on that coil. Seeing as it didn't start till they were done something is wrong with the install in my mind. Especially if mileage got worse.
 
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Nola_Jack

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I should’ve been more clear, it came on and the MPG dropped by 2 or so, I had them replace the plugs, it went away, and lasted 1k without coming back on again. So it was there before they touched it.

I took it back to the dealership and they immediately went to “well, it’s probably something lower in the motor” so I’m a bit hesitant to take it back to them again, considering the previous work seems like a more likely cause than “let’s spend serious money”.

I’m still of the train of thought it was something related to the change, because it cleared then waited 6 weeks to come back. I can’t imagine if it was one of the horror stories like a stuck lifter wiping the cam it would go away then come back.
 
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Elevated 2013

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Misfires are either a lack of spark or air or fuel. Replacing the spark plug should have taken care of that but it could still be fuel. Have you tried running a tank of gas with Seafoam in it? It could also be the ignition coil starting to go? Usually it’s a spark plug, ignition coil, or clogged/malfunctioning fuel injector that cylinder when it’s only 1 cylinder and all of the connections are all tight.


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Tim Garceau

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How many miles on the engine and how does it perform under heavy throttle?

Coils/injectors rarely go bad on the 2013+ Hemi engine, but feasible.

You might have to pull the driver’s vide valve cover and look at the travel, lifters are common failure and will open up your pocketbook.
 
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Nola_Jack

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How many miles on the engine and how does it perform under heavy throttle?

Coils/injectors rarely go bad on the 2013+ Hemi engine, but feasible.

You might have to pull the driver’s vide valve cover and look at the travel, lifters are common failure and will open up your pocketbook.

53k miles, performs fine, the only thing I’ve noticed is a bit of a shake when I’m coming off the break and letting it roll forward.
 

Brandon-w

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I'd also check compression that'll tell you lots as well..
 

RamCares

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I should’ve been more clear, it came on and the MPG dropped by 2 or so, I had them replace the plugs, it went away, and lasted 1k without coming back on again. So it was there before they touched it.

I took it back to the dealership and they immediately went to “well, it’s probably something lower in the motor” so I’m a bit hesitant to take it back to them again, considering the previous work seems like a more likely cause than “let’s spend serious money”.

I’m still of the train of thought it was something related to the change, because it cleared then waited 6 weeks to come back. I can’t imagine if it was one of the horror stories like a stuck lifter wiping the cam it would go away then come back.


Sorry to hear of the trouble you're experiencing, Nola_Jack. If you do decide to address this with your dealer again, please let us know via private message. We would be happy to have your situation documented and connect you with a case specialist for an additional layer of assistance while the truck is in service.

Mark
Ram Social Care Specialist
 

burner71

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misfire on #7 was what I had when my cam flattened with a stuck lifter.
 

burner71

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yeah, at first i thought it was an exhaust leak. Later i got the code when i got on the hwy. I replaced plugs, coils injectors the whole 9 yards.
 
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Nola_Jack

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I’m dropping it off at the dealership now, no ticking noises, but I’ve spent too much time in my life handling rifles to trust my hearing. I’ll update you guys with how it goes.
 
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Nola_Jack

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Check engine light came back on a couple of weeks ago. Brought it in again and got the call, lifters are bad, cam shaft needs to be replaced, and the heads are bad as well.

Knowing that this is not an unknown problem, should they have spotted this the last time I brought it in, when they said they had it apart and checked, maybe caught it before the additional damage?
 

Brandon-w

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Yeah they should have definately caught it. No real preventing any damage. Once they're fried they're fried no saving or preventing anything more really. I'd ask the dealer if you bought non mds cam and lifters if they'd put them in. That way you don't have to worry about it again.
 
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Nola_Jack

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Honestly, I’m thinking about jumping ship on the vehicle. It’s pretty disgusting to have an issue like this with under 60k miles. I asked them to give me a value for trade in and I’m waiting on them to get back to me before I make a decision.
 

Elevated 2013

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Sorry to hear you’re considering jumping ship. Every truck, from ant manufacturer is going to have some issues. Some worse than others. At least this is a free repair for you.
 

Brandon-w

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I've been through so much with mine now I might as well keep it. I plan to run it into the ground so why not. But yeah I was pretty on the fence when I had to do lifters, figured I'd be too upside down and $800 a month payments is over my budget. Figured within two months of payment NG for new I'd have the fix paid for and truck will be paid for in a few years so I might as well Bute the bullet. Plus Im kinda attached to her too lol.
 

huntergreen

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Yeah they should have definately caught it. No real preventing any damage. Once they're fried they're fried no saving or preventing anything more really. I'd ask the dealer if you bought non mds cam and lifters if they'd put them in. That way you don't have to worry about it again.


What makes you think mom Mrs lifters will solve the future issues ?
 

Brandon-w

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What makes you think mom Mrs lifters will solve the future issues ?
Well in my case the mds lifter collapsed and would not fill with oil (as designed to do when activated) causing it to hammer. Had they not been in there I almost 90% guarantee that would never have happened. I am not a fan of that crap, want a 4cyl get one but ya have a hemi, the fuel economy isn't that affected by shutting off or deleting mds so the whole point is far beyond me. All I know is that crap starts breaking down and costing money. Usually right after warranty too.
 
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