2017 Mirage P0300. Engine toast

[Fummins]

I guess I'll finally replace an engine on one of the fleet cars. Driver complained of shaking like they thought the transmission was gonna crap out. Only code I was able to pull was a random missfire. It's got a slight miss at idle, not enough to flash the cel though. I did an injector kill test and though the engine ran rough as each injector was shut off, it didn't change an awful lot when the #2 cylinder was shut off. So wth, might as well do a compression test. The thing has 400,000kms on it and I don't believe it's been pampered for any of those miles.

Cylinder 1: 168psi YAY!!!
Cylinder 2: 62psi not yay...
Cylinder 3: 150psi meh...

I'll probably take it for a rip before tearing it's heart out to make sure the cvt is still ok. I had the pan off it not too long ago and it was clean(ish) so I'll probably just replace the engine and see how long that cvt holds together.

[7milesout]

Interesting info. Keep us updated. I don't think we need to know every stinking detail, but some info along the way would be interesting.

Do you think it is a valve issue, piston ring issue, other, that's causing the loss of compression?

[Fummins]

Interesting info. Keep us updated. I don't think we need to know every stinking detail, but some info along the way would be interesting.

Do you think it is a valve issue, piston ring issue, other, that's causing the loss of compression?

I'm really not sure if it's top or bottom-end issue. I'll do a wet test later today and see how that goes.

[Fummins]

Looks like rings.

[Mirageman38]

Going to fix it or just swap another? I've never done any engine work myself and would be interested in learning.

[Fummins]

I'm just gonna replace the entire engine.

[7milesout]

I wonder how long it may go IF you just replaced the rings... Feel like an experiment?

[Fummins]

I wonder how long it may go IF you just replaced the rings... Feel like an experiment?

If I had the time and didn't have a ton of engines laying around I'd give it a try. I'll keep this one to the side one I get it swapped out and figure out what I'm gonna do with it. At a minimum, I'll eventually do a tear-down and see how the bearings and cylinders look.

I'll try to remember to do some compression tests on a few other higher-mileage cars. I have another 2017 with 442k km(275k miles) coming in later today. The highest is a 2015 with 480something. It's a little clacky and seems down on power but still moves.

[Fummins]

I should update this one. The transmission started acting up about a year after replacing the engine(@404k km). Could have possibly replaced the valve body and kept going but less downtime is preferred so I just replaced the entire cvt last June @448k kms.