Multiple misfires in 2015 gla250 - Mercedes GLA Forum
 
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post #1 of 6 Old 08-30-2019, 06:53 PM Thread Starter
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Multiple misfires in 2015 gla250

Ok so my 2015 gla 250 with 63k miiles is experiencing misfires in various cylinders over the past few months.
All the spark plugs have been replaced as well as ignition coils. Didnt solve problem.

My mechanic pulled the hose off the turbocharger and found oil in it as well as failing seals. He says the problems with the
turbocharger can be causing the misfires.

The warranty co. sent an adjuster yesterday to confirm the turbocharger problem, which he did. They also told me that some of the fan blades init were very worn down. So warranty is paying for a new turbocharger to be put in.

Question is: can turbocharger problems cause misfires??? i've googled it and cant find any listed correlation between the two.

Any wisdom imparted would be appreciated. I'm getting the car back Thurs. and if its still misfiring, we're at a loss figuring it out.

Thanks
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post #2 of 6 Old 08-31-2019, 12:19 AM
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Intermittent supply pressures will cause grief on all things down the line. Can't say that's the only problem but it sounds like a good place to start.

Let is know how it turns out.
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post #3 of 6 Old 08-31-2019, 12:48 AM Thread Starter
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thanks. so it is a possibilty? i wonder why there's nothing on google connnecting them
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post #4 of 6 Old 09-04-2019, 03:06 PM
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I would guess, and just a guess, that it is possible for that to cause a repeatable misfire. Can't extrapolate as to exactly what the cause would be though. There are so many conditions and variables, it doesn't take much to cause a misfire.

On a related note, I was having the same issue. Multiple misfire codes, getting worse and worse. Replaced plugs, coils, fuel pump, etc. End up being water in the gas. And not very much water either. Just a trace amount in the sample drawn from the tank. That small amount of water was causing several mechanical components to rust if it sat for a couple days.

It was found by sending a borescope down the spark plug hole to inspect the cylinder walls after sitting for a few days. Rusty. Then tested the gas in the tank.

Drained the gas, refilled with fresh, and the problem has gone away. Might be worth a try?

Good luck, and let us know how it goes!

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post #5 of 6 Old 09-04-2019, 04:28 PM
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WHERE did the water come from.....................????
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post #6 of 6 Old 09-04-2019, 05:24 PM
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Quote:
Originally Posted by nachEE222$ View Post
WHERE did the water come from.....................????
THAT is the question of the day right there...

I haven't been able to determine that yet, and likely never will. I started a thread (link below) about it when it first happened. Still not sure where the water came from though. A little disturbing.

https://www.glaowners.com/forum/gla-...al-advice.html

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