Help!! Dealership doesn’t know what’s wrong

[quarterboy25]

Little bit of background. I bought a 2018 limited last year with 175k miles on it. I know it was a lot but I got a great price and maintenance was done regularly. Fast forward to about last month, my cel came on and fordpass indicated there was a misfire. Took it to a local shop and they changed all 6 spark plugs. Trucked started driving normal for about a week and the cel came back on again with the same misfire message. Took it back to the shop and the mechanic did a complete check up including turbo and stated that I needed a new engine with labor would be about 11k. Of course, I did not do that and took back the truck. After another week, the truck was driving normally and Deja vu, the cel misfire comes on again. This time, I took it to the ford dealership. They have had it for the past 3 plus days. I talked with them today, they said they don’t know what is wrong. When the mechanic, disconnects the turbo, the truck idles and runs normally. However, when he plugs it back up, its idles rough and accelerates slowly. The dealer is still flabbergasted.

Has anybody experienced this or are aware of any possible reasons for this? I know I have been very generic with my story but that’s all I have been told and I’m not the most mechanically inclined. Thank you for reading and any suggestions are welcomed.

 

[slow3v]

Sounds like it might need a new turbo, but I'd take it to a different dealership to get a different diagnosis before anything. There are two turbos, which is the problem one?

Has the truck ever had phasers done?

 

[quarterboy25]

Phasers have not been done to my knowledge. Could that cause the engine to misfire? They didn’t tell me anything about if which turbo could be possibly bad. Only that “the mechanic has had it in his bay for the last 3 days trying to figure it out.” I’m afraid that I might have to take it to another dealership. I just really hate having to possibly start with another dealership. I have a 3rd party extended warranty (Endurance). But they can’t possibly do anything until they are also told what’s wrong.

 

[SyndicateZ]

Time to send it to Dave in Utah

 

[kep5niner]

If you’re getting a Check Engine Light, post what Diagnostic Trouble Codes (DTCs) you get. A OBD2 code reader is required for that. If you don’t have one, I’ve used Blue Driver for years and it works great. About $100 on the Amazon. Or take it to your local parts store, they should be able to pull codes and tell you what they are.

Then post them on here. You will get much more intelligible responses.

 

[GixxerJasen]

I can't help here but...

They have had it for the past 3 plus days. I talked with them today

Wow! A dealership working on a vehicle immediately and responding within 3 days, that's amazing!

 

[dlcorbett]

My nav is back at the dealer. CEL came and stayed on. However, it only acts up different in eco mode, though the turbos act like their not pushing air since they put the new ones in. I feel like it needs new plugs, but dealer has yet to diagnose it. Dropped it off Monday, no call yet. I wanna take it to a local shop, but the fact that I want the dealer to take accountability for this is why I keep takin it back.

 

[quarterboy25]

Update—
Just heard back from the dealership a few mins ago. He said that there is low compression and that I will need a new engine. They said that they don’t know exactly what is causing the low compression without completely breaking the engine down and checking it but that would cost alone $2500. He said it would just be easier to get a new engine. Now the fight is with my warranty company because they now have to research and give a call back before they can approve or not.

 

[Mediamonkey11]

Interesting that'd revolve around the turbo being connected vs disconnected.

Curious if they told you which cylinder(s) is low and how low?

 

[Hellwig]

My nav is back at the dealer. CEL came and stayed on. However, it only acts up different in eco mode, though the turbos act like their not pushing air since they put the new ones in. I feel like it needs new plugs, but dealer has yet to diagnose it. Dropped it off Monday, no call yet. I wanna take it to a local shop, but the fact that I want the dealer to take accountability for this is why I keep takin it back.

Did they replace the turbo oil supply line filter like this?

https://edu1.parts.ford.com/shop/en/us/filters/other-filters/filter-assy-13746483-1

 

[SyndicateZ]

Update—
Just heard back from the dealership a few mins ago. He said that there is low compression and that I will need a new engine. They said that they don’t know exactly what is causing the low compression without completely breaking the engine down and checking it but that would cost alone $2500. He said it would just be easier to get a new engine. Now the fight is with my warranty company because they now have to research and give a call back before they can approve or not.

That sux man. I guess we know why u got a hellauva deal on the expy now.

 

[JamaicaJoe]

Update—
Just heard back from the dealership a few mins ago. He said that there is low compression and that I will need a new engine. They said that they don’t know exactly what is causing the low compression without completely breaking the engine down and checking it but that would cost alone $2500. He said it would just be easier to get a new engine. Now the fight is with my warranty company because they now have to research and give a call back before they can approve or not.

Low compression all cylinders? One cylinder? Are they actually measuring each cylinder or doing a power balance test? Maybe your Cat's are plugged?? Leakdown test? Is air heard getting past a valve? It does not take an engine teardown to determine this.

 

[Dice Roll]

Find somebody that knows how to work on cars and have them leak it down.

 

[BravoAlpha]

My nose is runny, guess I need a head replacement

 

[quarterboy25]

You guys have all gave great suggestions. Thank y’all so much. Had it towed to a non dealership local mechanic. Ran compression tests. Said low compression on 2 cylinders. Told me the same thing as the dealership. Can go into to see what is exactly causing it but it could be anything and would be easier to get a new engine.

That sux man. I guess we know why u got a hellauva deal on the expy now.

It ran great for almost a year until the first check engine light for spark plugs about a month ago. I don’t drive aggressively with it. I’ve had 2 other used expys and I used to drive straight through any cel until they would start flashing. Wanted to do the right thing with this expy and it’s been very time consuming and possibly expensive.

 

[SyndicateZ]

You guys have all gave great suggestions. Thank y’all so much. Had it towed to a non dealership local mechanic. Ran compression tests. Said low compression on 2 cylinders. Told me the same thing as the dealership. Can go into to see what is exactly causing it but it could be anything and would be easier to get a new engine.

It ran great for almost a year until the first check engine light for spark plugs about a month ago. I don’t drive aggressively with it. I’ve had 2 other used expys and I used to drive straight through any cel until they would start flashing. Wanted to do the right thing with this expy and it’s been very time consuming and possibly expensive.

I hope everything works out! That sux man. You keep up with maintenance and everything only for the engine to fail still.

 

[Soliyou]

You guys have all gave great suggestions. Thank y’all so much. Had it towed to a non dealership local mechanic. Ran compression tests. Said low compression on 2 cylinders. Told me the same thing as the dealership. Can go into to see what is exactly causing it but it could be anything and would be easier to get a new engine.

It ran great for almost a year until the first check engine light for spark plugs about a month ago. I don’t drive aggressively with it. I’ve had 2 other used expys and I used to drive straight through any cel until they would start flashing. Wanted to do the right thing with this expy and it’s been very time consuming and possibly expensive.

I don’t think you should pay for a new engine now. Take it to a real mechanic for proper diagnostics. They will charge you 2-3 hours for diagnostics but can know exactly why it has low compression. I doubt it is a burnt valve or broken piston since it is very unlikely to happen in two cylinders at the same time! This can be as simple as a some carbon deposits on the intake valves.

Where r you located??

 

[quarterboy25]

I’m located in upstate South Carolina in the Greenville area.

 

[techdude99]

Another shop or Ford store is a good idea. I would want a compression check with detailed results. If there are low cylinders, I would put a camera snake down there and take pics of the damage.

 

[Aaron Buchanan]

have you changed the coils on it. They tend to breakdown after high mileage and heat retained in the engine bay. If the check engine light for misfire came up again. After plugs I would suspect coils, cats.