Multiple cylinder misfires

[LV8RGUY]

2020 gladiator rubicon, launch edition. 3.6, with 98,000 miles. Got the P300 misfire code. But truck seemed to drive normal. Next day, heavy vibration in morning, but drove fine after warm. Took to dealer that day, even though they couldn’t give me an appointment for 11 days. Went to dealer on the 11th day, day of my appointment, truck still sitting in same spot.
been in shop for almost 2 weeks since. 700$ in diagnosis so far. Dealers response, need new engine.
if I do all my oil changes based on Jeeps recommendations, and also do all my changes at the dealership, then why should I be on the hook for a $12,000 repair. Talk to Jeep cares, they put in to cover for 90%, denied. I asked Jeep why I should pay $70,000 for another jeep if the engine won’t even last before my payments run out.

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[Hootbro]

2020 gladiator rubicon, launch edition. 3.6, with 98,000 miles. Got the P300 misfire code. But truck seemed to drive normal. Next day, heavy vibration in morning, but drove fine after warm. Took to dealer that day, even though they couldn’t give me an appointment for 11 days. Went to dealer on the 11th day, day of my appointment, truck still sitting in same spot.
been in shop for almost 2 weeks since. 700$ in diagnosis so far. Dealers response, need new engine.
if I do all my oil changes based on Jeeps recommendations, and also do all my changes at the dealership, then why should I be on the hook for a $12,000 repair. Talk to Jeep cares, they put in to cover for 90%, denied. I asked Jeep why I should pay $70,000 for another jeep if the engine won’t even last before my payments run out.

I would get a second opinion. Pretty sure they are just trying to fleece you for the cost of a new engine. I would ask for what made them determine it was the engine and not coil, plugs or even a bad fuel injector?

You are also pretty close to the 100K recommended spark plug change out interval and I would not discount that being a cause also of worn plugs.

If your understanding of vehicle mechanics is limited, many shops are going to take advantage of that if you do not have the knowledge to push back and ask more detailed questions.

 

[ShadowsPapa]

2020 gladiator rubicon, launch edition. 3.6, with 98,000 miles. Got the P300 misfire code. But truck seemed to drive normal. Next day, heavy vibration in morning, but drove fine after warm. Took to dealer that day, even though they couldn’t give me an appointment for 11 days. Went to dealer on the 11th day, day of my appointment, truck still sitting in same spot.
been in shop for almost 2 weeks since. 700$ in diagnosis so far. Dealers response, need new engine.
if I do all my oil changes based on Jeeps recommendations, and also do all my changes at the dealership, then why should I be on the hook for a $12,000 repair. Talk to Jeep cares, they put in to cover for 90%, denied. I asked Jeep why I should pay $70,000 for another jeep if the engine won’t even last before my payments run out.

Not sure if I'm reading this correctly - you have 98,000 miles, and are still making payments, and you realize the drivetrain warranty is not 100,000 miles, but still want an engine covered at almost 100,000 miles? Still making payments doesn't count because a person can, these days, wear a vehicle out and still be paying on a 7 year loan. I can't ever see taking a long term loan and taking it to full term on something that's going to be way out of warranty only half-way through the loan term period. That part isn't Jeep's fault, though........ we make choices.

It's a 2020 - my first thinking is CAM and followers.
But the fact that it goes away after it's warm is suggesting perhaps not.
At those miles, yeah, @Hootbro may be onto something - plugs, coil packs. If nothing else at almost 100,000 miles you need plugs, and while in there, coil packs would be cheap do to - basically only parts as half the work is done changing the plugs.
A cold engine is harder to "ignite", so that's a place to start.

I am seeing some mixed messages here.........

 

[LV8RGUY]

first off it’s not a seven year loan. It’s a 2020 gladiator in today is 2024, it’s a typical five-year loan, and I have less than 12 payments left. I’m under no impression that I think should cover a vehicle forever, my contention is that despite their 60,000 mile warranty, if you do all of your oil changes per their recommendations, and also use their people to change your oil, are they now saying that they cannot guarantee that an engine will fail at 61,000 miles? If that is the case then again, I asked the same question. Why would I ever spend $70,000 again on a vehicle that with proper maintenance will not outlast a typical five year loan. I stayed on top of the dealership and the mechanics at every step. their deep scan showed that the cylinder misfire was on cylinder number three, and subsequently changed the coil wire and plug. Yet the issue was still happening. Their next step was to check cams and cylinder pressurization. Which all showed normal. They wanted to remove the upper cylinder, but I wanted them to make sure that all the external components were checked first, for example, PCM, and any other electrical issues before they started into a cylinder tear down. They believe that the oil passages are blocked, which control VVT, and therefore air/fuel.
if in fact, it is oil passages being blocked, that is where I have the problem in the fact that I did everything I was supposed to do

 

[ShadowsPapa]

if you do all of your oil changes per their recommendations, and also use their people to change your oil, are they now saying that they cannot guarantee that an engine will fail at 61,000 miles?

You are still missing the main point - YOU had one fail, an individual failure and at a fair number of miles. Further, for all anyone knows, the fix could be extremely simple. You don't really have any solid information to base anything on or even know for sure the engine has actually failed.
Expecting to go forever with no issues at all for every vehicle made - unrealistic.
My gut says the dealer is wrong and the fix isn't a whole engine. It might be, but still, there's a lot of people here with high miles on these and no major failures.
So you can't say that they can't guarantee an engine won't fail at xx miles - no one can say every engine will be perfect and none will ever fail. There's always odds.
You just happen to be stuck in a hard spot now because you have one that has a problem, and the dealer is apparently taking the easy way out instead of any real diagnostics.
If it was mine - I'd spend for plugs and coil packs and give it a shot - or better yet - I'd put a scope to it, or some software like AlfaOBD and do a freeze frame capture and try to find exactly where the problems are. I've used AlfaOBD to find ignition misfires were the cause in a Grand Cherokee we had - spark plugs fixed it. It was up to me to diagnose and prove it was ignition because the dealer didn't see anything wrong - until I gave them the clues.

 

[Banned]

Stop with the insurance fraud ideas. That's not ethical and should not be encouraged. This kind of behavior doesn't belong here. Not even as a joke.

Hey, dad, we've all been sodomized for decades by insurance companies, so let's lighten up on the righteousness. My insurance went up

 

[tnjarhead]

i always call insurance and say i hit a puddle and the motor stopped working. shops dont care where the money comes from so i just find one that willing to go along with it. had 3 motors replaced across 3 different vehicles by insurance. cus i "hydrolocked" it.

Class act right there!

 

[ShadowsPapa]

And some of the comments are one of the reasons rates skyrocket - fraud.
It's like shoplifting, we all pay for it. Company's gonna make money regardless. costs go up, rates go up.
It's one reason for the dropping of paper verified low mileage discounts by some - fraud. Let's lie on the paper and send it in.

 

[Banned]

Sure, buddy.

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