2010 Ram 1500 5.7 - mystery P0305 - cyl 5 misfire

[shelbymopar]

Hey all,

Backstory on the truck. Bought it at 140,000 kms used, just had it's plugs and exhaust manifold done.

Now has 220,000 kms on it, mostly highway. Religious 8k synthetic oil changes, samples sent off at 190,000 km and they said I could get another 3000-5000 kms out of the oil, but I change at 8k intervals regardless.

Anyway, truck has a very intermittent cyl 5 misfire. Truck runs flawlessly as far as I can tell. No hesitation, bogging, stumbling, etc.

I just did the plugs, and made sure to put the coil packs on the exact cylinders they came off of after doing them.

While idling the other day, the truck stumbled for a second, then cyl 5 misfire showed up. I thought great, cam and lifters time. I drove it home, didn't notice any difference in power or lugging or anything of the sort. I did just install a sub and amp combo and was testing the bass settings out while idling. I'm running the original alternator on the truck.

I could have sworn I heard a metallic lifter like sound when revving once I got the truck home, but I honestly could not tell the area it was coming from. Noise increased with RPM.

So I pulled the valve covers, checked to see if there was anything drastic showing like one of the intake or exhaust valves not opening or closing normally. But it looked completely fine.

I've swapped the coil packs to see if issue chases cylinder. Code hasn't come back yet after erasing it and disconnecting the battery while I was working on the truck.

There's no noticeable sound, no misfire, power seems good. Wondering what the hell I'm dealing with here or if I should be expecting a cam job soon. I do have a tune on the truck with MDS disabled.

Oil looked fine, no metallic sparkles in it. I changed it anyway after pulling the valve covers off.


Thanks in advance. I've linked the video of the driver side valve cover removed and engine running. Hopefully it works

https://drive.google.com/file/d/1Z5Q1QyLbJH6MAuFcMcYDbcBpe6tCn4AJ/view?usp=drivesdk



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[Burla]

Yes, expect a cam job soon would be my guess that mileage on an old ram, if not cool. What weight oil were you using? Can you post your last uoa? You use blackstone, and you are familar with thier system that lets you post w/o posting personal info?

btw, what oil do you use?

 

[shelbymopar]

For some reason it wouldn't let me attach my last oil change analysis. It is with Blackstone, and had nothing unusual showing. They said "try doing an oil change at 9500 km mark instead of 6000"

I usually use whatever synthetic 5w20 is on sale. It's typically Mobil 1, the odd time I've run Pennzoil.

I did pull some oil and put it in another sample container for Blackstone during this recent oil change.


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[Bee1971]

If you still have your old oil filter cut it open and cut/pull the media paper out and run a magnet over it

You will know if you have a cam and lifter going

 

[shelbymopar]

Unfortunately I don't have the old filter anymore.

I had thought about that too, dang.

Shouldn't some of it show up in the oil sample anyway, if I send it out to Blackstone?

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