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GL Class (X166) 2013-Present

Cylinder #5 Misfire SOLVED

 
Old 01-21-2019, 01:38 PM
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Cylinder #5 Misfire SOLVED

2013 GL550 with the M278 Biturbo Engine

For those of you looking into a 2013 or early Model X166, besides bringing it for a pre-purchase inspection, I would recommend scanning for any engine codes or "stored" codes for Cylinder #5 misfire as you do not want to go through the hassle I went. Especially for these cars, topping off the purchase with an extended warranty consideration would be essential as many things can go wrong if the one you are buying isn't Certified Pre Owned.

Essentially, not even 2 months after purchasing our GL550, the Check engine light came on for Misfire on Cylinder 5

We took it to the dealer and dealer informed us the 70k interval maintenance had already been done so transmission fluid and more importantly, spark plugs had been changed. We had these items changed after the light came on which did not resolve the problem for me:
-Both MAP sensors: 0071530528 Manifold Absolute Pressure Sensor (As it worked for another member)
-Ignition coil
-Changed both engine air filters
-Fuel injectors (changed them 3 times at the dealer as they kept thinking this was the problem)
-Software update (at the dealer. After changing the fuel injector the 2nd time, they discovered there was somehow an "update" and went ahead and updated it)

This problem still persisted and everything checked out fine which puzzled the dealer, leading to an engine disassembly.....Engine was dropped which transmission, exhaust, and many others had to come out.





Fun stuff.....

After engine disassembly.......:






Leaking Cylinder
The circled cylinder in blue is what the technician told me was the cylinder that was leaking and the "valves", in red, specifically was the actual "seals" (either intake or exhaust - don't remember), that were leaking.

He also did a water test for me. MP4 vids don't post here so here is the link:

Will update as repair continues.
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Old 01-21-2019, 04:48 PM
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2013 GL550
Since the engine is out, this might be a good time to port and polish the heads, as well as replace the valve stems. Then it would be like a brand new engine after they get it back together and will put out even more power than stock and run more efficiently. If the mechanic working on it is a car enthusiast and has experience with rebuilds, then you may be able to talk him into doing it as a side job on the weekend. Since the engine is already taken apart, it shouldn't cost all that much to do it.

Do you currently have a warranty on it? How much have the repairs run you so far?
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Old 07-04-2019, 11:31 AM
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UPDATE 7/4/2019

On 6/26/2019, we finally got our car back. After engine disassembly, our extended warranty company, Endurance had been delaying the repair as long as they could. They went back and forth, sending inspector after inspector, and did not believe the heads with Cylinder #5 was leaking. They made the dealer send the head to an independent head repair shop, have them inspect it, and then return it to the dealer. Even though we had the "top-of-the-line", "bumper-to-bumper" warranty package listed on their website as "Supreme" package, to offer "peace-of-mind", they were a PITA to deal with. Calls took 30 minutes on hold to get to a "customer service" agent who had no idea what was going on. Both, my service advisor (SA), and myself had to repetitively call to follow on essentially everything. The "rental car" option actually only covers up to something like 7 days of the repair and you had to get it from, I believe the company, Enterprise, unlike CPO offers dealer loaner cars for the length of the repair. Endurance finally had no choice, but to repair the GL.

Basically, they went literally "By the book". They only paid for what was "essential" to the disassembly of the engine and reassembly and also brought their own parts in. Because only 1 of the 2 heads was bad and needed replacement, the SA strongly recommended replacing the other head too. Only the cost of parts, would have totalled to $13,593 for the full engine rebuild (Attached PDF). The extended warranty company offered to purchase their own parts from their own source(Which was half of the parts on the list for one head), and I also brought in my own parts(The other half of the parts on the parts list for the other head) which totalled to around $4000, instead of $6500 which the dealer wanted per the pdf attached.

After all the parts arrived, the dealer started engine reassembly. The engine reassembly process was also on-and-off since apparently the technician installing it "lost some parts" and also realized some parts could not be put back onto the car, like Thermostat, coolant hoses, etc. At this point, the "extra parts" needed, was billed into the invoice and SA had called Endurance to finalize the bill. Final cost of the bill at the dealer was $10119.99 and endurance only paid $7253.17 (Basically labor + very little "extra parts" they covered) when my deductible is $200....... My total cost at the dealer was $3048.65 because of the "additional parts needed". Needless to say, when the technician was test driving the car, the auxiliary battery failed, so that was included into my total. I am probably forgetting some stuff as this process was from Christmas of 2018 to end of June 2019. Both files attached.

If I were to buy another used car, definitely go with CPO and a pre-purchase inspection.

https://drive.google.com/file/d/1u2H...ew?usp=sharing
https://drive.google.com/open?id=1sC...fMo5ZwfHduGBGA

Last edited by Tek.To; 07-04-2019 at 11:34 AM.
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Old 07-04-2019, 01:39 PM
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Glad you got the vehicle back.

Agree with your comment on CPO vs third party warranty company.

Is valve stem seal or valve seat failure common with the M278 at less than 100k miles?
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Old 07-04-2019, 10:19 PM
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Carmax maxcare.

Ours has paid over 20k$ in covered repairs and my sa says they are the easiest to deal with.
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Old 07-06-2019, 12:13 AM
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chassis I don't think the valve stem seals are that common in the M278 since I haven't seen them around in this forum except for mine. kombifan My SA told me Certified Pre Owned and "Redshield" are the easiest to deal with. I will check out Carmax maxcare too! Thanks
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Old 07-06-2019, 12:34 AM
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For me the biggest issues have been the techs replicating difficult issues.

Carmax maxcare has been stellar in their payments and covering nearly everything. Except glass and Wear and tear items. They even covered my led rear taillight.
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Old 07-11-2019, 10:51 AM
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This also happens to the 5.5L V8 M157 engine (GL63/ML63/CLS63/E63/S63/etc). There have been about 3-4 just at my local dealership and the cost is around $15,000 out of pocket or 100% covered under factory warranty or CPO.

It's also Cylinder #5 misfire, the issue I'm told is the factory press didn't push in the sleeve correctly and causes a leak. Not all M157 are affected, but the ones that used that press were. At least what I'm told.

Interesting this also occurred on a M278 non-hand built engine.

Glad you got this fixed and enjoy your "brand new" engine!

How much did the extra valve stems cost you for the other side? Looks like normal carbon build-up so as the other poster mentioned, possibly re-gained hp/torque and fuel economy. Hopefully the car now lasts you 300,000 miles!!

Watch your transmission - if it starts clunking or hard shifting, a few also got that and the torque converter replaced under warranty - which is another $10-$15k repair at least on the AMG.

On the used market, your car is the one to own, similar to a M156 engine that already head the head bolt issue resolved!
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Old 07-11-2019, 11:58 AM
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Does anyone know if a TSB has been issued for either the valve stem seals or transmission clunk on M278? I also have 2013 GL550 with 65K miles. No issues so far with either. My CPO warranty runs out in November.
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Old 07-11-2019, 12:11 PM
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No TSB I am aware of.

For the transmission on the AMG, I showed this thread to my service rep and this is how I got the process started: https://mbworld.org/forums/gl63-amg/...n-2nd-3rd.html
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Old 07-12-2019, 08:22 PM
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Chedman13 What transmission do you have on your 2014 GL63? My 2013 GL550, according to a vin decoder, has the 722.909 transmission. I've never heard of the transmission clunk on the 722.9, only the conductor plate issues where the car will shift into "neutral" and you lose speed + can't shift into any gears, even with manual shifting via paddle shifters.
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Old 07-12-2019, 10:37 PM
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