sneezix

On the trip back from Oakland, where I picked up my '17 GTS, a couple of times I noticed that it ran a bit rough on a new tank of gas.
Once, I put in some octane booster, but I'm not sure if it helped, but I only noticed the rough running on full tanks (not every time).

Anyway, today the Check Engine Light came on, with the following codes:

P0300: Random Misfire
P0301: Misfire on Cylinder 1
P0306: Misfire on Cylilnder 6

I put in some octane boost, today, in hopes that it's the gas.

Does the warranty transfer to a second owner?

sam9187

Yes the factory warranty transfers. You should take it in to the dealer.

triblk6spd

Dealer . Asap. If you are running 91 or 93 octane it's might Be fuel. Stop putting octane booster in it as well.
That being said you could get a bad tank of gas but it sounds like you ar e past that.

sneezix

I used 91 octane on the trip, 93 since I got to Austin. I'll make an appointment to take it in, tomorrow.

Thanks.

thebishman

Always use a place that sells 'Tier 1' fuel, and it's best to get your fuel from a busy station as the gas never stays in the holding tank long enough to get contaminated.

Good luck, and as others state the dealer will sort it out for you.

BTW, it didn't have an aftermarket tune installed did it?

Bish

sneezix

Shell and Phillips 66.

None that I know of. I'm sure that the PO would have told me, if it did.

Thanks, bishman.

Stentplacer

sneezix

Nothing, yet, as he's not psychic. I take it in, tomorrow. :-)

06032

Check the ignition coils.

sneezix

That was one of my thoughts, and I would, if I weren't under warranty. I haven't dug around in the engine compartment more than a little bit, but holy hell, where is everything?

sneezix

They found nothing. They reset the codes, checked for a software update (there was none), and road-tested it.

The service advisor's theory was that I started it up and shut it off too quickly, leaving excess fuel in cylinders
1 and 6, causing the codes the next time I started it up. :shrug:

It seems to be running fine, now.

sneezix

Well, that didn't take long. The CEL reappeared on Saturday. It's back
at the dealer. They told me that it's the same two cylinders (1 & 6), but
they don't see anything wrong, so they're going to "open a case with Mercedes."

JSwan724

sneezix

Well, that's the first thing that I would do, I'm hoping that they've thought of that, themselves. Even if I did have some in stock,
i'd switch them, to make sure that the problem does lie in the Coil Packs.

06032

+1...and check the TSB's. Known issue.

sneezix

WHY DOES THE DEALER NOT KNOW THIS????

Do you have a TSB number?

sneezix

UPDATE: I got the car back, today. Same codes, same cylinder misfires. They did check the coil packs, first, but they were okay. They ended up changing out the fuel injectors.

Hopefully, that will be the end of this thread.