2.0 Failure

[VNT]

Have a friend who is a tech, replacing a 2.0 Turbo engine in a Cherokee with 58K. Car was always serviced and engine internals look clean.

He had it pulled from the car and had it in his stall, waiting on the new engine. The good news is there was no carbon or build up on the valves. The bad news is that one of the pistons was melted down and the lands collapsed/ melted on one side , the intake port side. The car came in running poorly and he test drove and did compression and #2 cylinder was dead. I guess they are putting in new engine, turbo and injectors.

The other thing he also told me was these 2.0 engines do not have iron liners, I guess they use aluminum with a coating on the cylinder walls. He said the cylinder wall was worn thru to the aluminum on the dead cylinder.

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[CarbonSteel]

Have a friend who is a tech, replacing a 2.0 Turbo engine in a Cherokee with 58K. Car was always serviced and engine internals look clean.

He had it pulled from the car and had it in his stall, waiting on the new engine. The good news is there was no carbon or build up on the valves. The bad news is that one of the pistons was melted down and the lands collapsed/ melted on one side , the intake port side. The car came in running poorly and he test drove and did compression and #2 cylinder was dead. I guess they are putting in new engine, turbo and injectors.

The other thing he also told me was these 2.0 engines do not have iron liners, I guess they use aluminum with a coating on the cylinder walls. He said the cylinder wall was worn thru to the aluminum on the dead cylinder.

Geez...I thought cylinder coatings went the way of the dodo when the Chevy Vega disappeared. Curious as to how that was not making enough noise that the owner did not realize there was something seriously wrong.

 

[VNT]

Well maybe they are using a real thin iron liner with a plasma coating, like Ford is using on the 5.0 engines. I couldnt find any literature per the construction of the 2.0, but here is a brief on the subject.

I assume the failure must have been with the injection, running lean on that cylinder.

All the ports looked clean, so at least they dont have all the issues of carbon build up on the intake valves from the PCV system.

No one on the forum here that I am aware of would take a peak with a bore scope.


https://www.sae.org/publications/technical-papers/content/2000-05-0069/

 

[west tex]

Hope he has the extended warranty.

 

[VNT]

I think it was covered under the 5yr power train warranty. Lots of hours dropping all the suspension, transaxle, PTU and k frame to get it out.

Will never buy another E-W engine set up. looked like a nightmare to service the PTU.

 

[AnnDee4444]

I assume the failure must have been with the injection, running lean on that cylinder.

That's what my guess is too. Partially clogged injector maybe?

 

[four low]

This looks like " Low Speed pre- ignition " ( LSPI)
that can occur in small displacement turbo gas engines.
Primary cause, low speeds, high loads. Hot spots cause detonation, high cylinder pressures.
Ford knows about this, especially in the 2300cc Turbo engine.
Critical to avoiding this is correct oil especially formulated for Direct Injection engines

 

[VNT]

I dont know, he might have had a misfire code, he said he test drove it and it was running poorly LOL He is a damn good tech, 25 yrs and has had a lot of Jeeps, has a lifted Gladiator and Sahara for the wife, both 3.6 autos. He does a lot of the engine work and diag work.

Said they use roller bearings in the heads on the ends for the cams, never scene that before, also all the journals and bearing looked mint, he pull all the pistons out to learn, first time he has opened a 2.0. He had to put it back together to send back.

 

[VNT]

Could be LSPI, didnt think of that, will forward the info. Maybe someone used high calcium oil in it and low octane gas. He did say they serviced it but who knows, note they are a pretty decent dealer with a good service dept. I am sure if they did the oil changes they used the correct Penzoil 5w-30 in it, but who knows if the customer took it to other places??

 

[four low]

Oils have been reformulated for just this LSPI problem, another reason to not second- guess the manufacturers oil requirements. That can get expensive fast

 

[Heimkehr]

Critical to avoiding this is correct oil especially formulated for Direct Injection engines

The 2021 Owner's Manual is very prescriptive concerning the API SP/GF-6 oil specification. I'm careful to purchase Mobil 1 5W-30 with that rating plainly evident on the rear label.

The text in the manual is at odds with the "API SN PLUS" text [still] printed on the oil fill cap.

Coincidentally, I've an oil sample in transit to Blackstone right now for testing. I change my own fluids, preferring not to take any chances with negligent 6 quart fills via the Jeep Wave benefit.

 

[Odyssey USA]

That's what my guess is too. Partially clogged injector maybe?

That’s what I’m thinking as well.

 

[gato]

The 2.0T engine on the Wrangler, according to Jeep press releases and every source I have seen has " a low-pressure, sand-cast aluminum cylinder block with cast-iron liners".

I don't think they use any iron plasma infusion/coating - it is a traditional iron liner per the descriptions.

https://www.motorreviewer.com/engine.php?engine_id=168

 

[Tank the Jeep]

This looks like " Low Speed pre- ignition " ( LSPI)
that can occur in small displacement turbo gas engines.
Primary cause, low speeds, high loads. Hot spots cause detonation, high cylinder pressures.
Ford knows about this, especially in the 2300cc Turbo engine.
Critical to avoiding this is correct oil especially formulated for Direct Injection engines

Y’all are over my head with this stuff. But what you describe as LSPI sounds a lot like what ESS does. Low speed, under load, with hot spots.

 

[CptFloridaMan]

Pre-detonation is why the subaru guys are always rebuilding short blocks when tuning . It wouldn’t surprise me if that’s what killed that engine. In theory though, the tcm/ecm should be downshifting to avoid lugging the engine.
It’s also an interesting thought I had is with etorque it shouldn’t be too bad in the low RPMs.

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