Cylinder 8 misfire issue

[Benjamin Watson]

I have a 2014 Ram 1500 5.7. I have been having this issue for a while. It drives fine most of the time. But randomly, almost every time I drive it, it will begin to miss intermittently. Sometime it will miss enough it will cause the engine light to come on and then it goes into a mode to run rougher almost as if it were out of time and with reduced power. To remedy this i simply cycle the key and it’s back to normal... until it happens again. There seems to be no pattern as to what causes it. It’s happen sitting still cruising and accelerating. The associated engine codes are P0308 and P2323. I’ve read some on the internet that give me and inclination that this isn’t a unique situation but from those few threads there were no solutions. Help!

 

[Tim Garceau]

Good Morning,

How many miles/kilometers?

Did you by chance play any tight end?

Thanks,
Tim

 

[Benjamin Watson]

Haha no different Ben Watson

approx 105k miles
But I’ve had the problem off and on since about 50k

 

[Tim Garceau]

Likely you had and have a seized roller lifter and it chewed up the camshaft.

If you’ve haven’t done plugs at 100k it’s possible that is causing a misfire. I would pull the passenger valve cover and check rocker travel on cylinder 8 since that one is easier to get off to prepare your pocketbook. Eventually it’ll go full limp mode and be useless if using to commute.

 

[Benjamin Watson]

I changed the plugs at about 60k and cylinder 8 coil. I’ll check it again. Obviously cheapest routes first. At about 75k the cam shaft got trashed and they had to replace it.

 

[Fuel35 67]

I did a 6.1 swap into a 67 Belvedere and kept getting a misfire code for #6. I changed coils around, still did it, installed new plugs from the get go then bought new coils from MSD. Still misfired on #6.

Tire the engine apart, cam was shot along with 2 lines. New cam and updated lifters, smooth as silk.

So I’m thinking you’ve got a cam lobe(s) ate up.

 

[jws123]

Does it knock? or tap more then normal if so could be a cam lobe/lifter like shown above. But first if i where you i would swap coils see if diff cylinder misfires same for injectors aswell as check plugs.

 

[Benjamin Watson]

There is no knock or abnormal noise. Only a slight miss here and there. If you were to drive 30 min on average you may only feel 4-5 misses and with no general pattern. Like I said sometimes the miss puts it into limp mode but most of the time it doesn’t. I will check plugs and wires tonight

 

[gofishn]

pull valve covers and watch teh valve movement. simple cheap and will elemeinate or isolate a huge reapir, which it sound liek you already had done, once before.

 

[Burla]

Curious what oil you are using, we all defer to calling it cam/lifters because we have seen it so much. If it is that, and you had it done, then fca can sometimes mitigate the damage, I would talk to them.

You had this since 50km, and then they replaced cam, and you still have had it, suggests it is "possible" it is something else. Grasping at straws, I'd say TIMP? can be taken apart and soldered dyi.

 

[Benjamin Watson]

What is TIMP?

 

[Burla]

Maybe they didn't replace lifters and just did the cam? Do you have more info on the first cam wipe, which lob/lifter failed then, etc. More info the better??? If you have the cam done, demand old lifters and cam for evidence, tell them it happened before so you are sensitive to it.

 

[Burla]

What is TIMP?

The brains to the truck, do some research on it. @Hemi395 do you have that killer video? That was a forum phone call, I'm sure he will post it with his thoughts, remember that is a shot in the dark by my part. We need a lot more info to narrow choices, my sense is the cam still. Maybe it was a dealer rush job as opposed to a complete swap, I dunno?

If one of your relays is corroded, it could cause intermittent problem.

What oil/oils did you use regularly?

 

[Octane]

The lifter would have to be replaced along with the cam when they repaired it.The lifter failed and then the cam was damaged.

 

[Burla]

For sure, dealers never cut corners? But like I said, we need more info or we are shooting blind.

 

[Benjamin Watson]

I’ll try and see if I can find the full write up on the repair

 

[Hemi395]

@Burla is this the video you're thinking of?

 

[Octane]

I changed out a worn out cam on my about worn out 64 impala engine and never changed the lifters and I dogged that motor for two years before I tore it down.Lucky the cam and lifters didnt fail from the beginning.That was my motor.Never would do that on anyone elses vehicle even if they wanted me too.

 

[Burla]

All I can say is you aren't supposed to have a cam fail at 50k, and then after the dealer fixed it again at another 50k. So generally I blame the dealer and manu and nobody else.

 

[gofishn]

I changed out a worn out cam on my about worn out 64 impala engine and never changed the lifters and I dogged that motor for two years before I tore it down.Lucky the cam and lifters didnt fail from the beginning.That was my motor.Never would do that on anyone elses vehicle even if they wanted me too.

Different tech. and a hellovalot different manufacturing processes and quality control.