Elevated

Hey guys, I just recently picked up a 2015 e63s wagon. Fell in love with the car (minus the creaks), but have suddenly ran into some issues. I purchased the car through ebay and when I got it everything was fine for the most part. After about a week of driving I decided to scan the car and saw that it had a cylinder 5 misfire. I proceeded to have a tech check the plugs, which looked original, so we changed them out during that time. We swapped coils and the misfire didnt follow, but insisted on putting on OEM bosch ignition coil on. Once that was done, the misfire still was present. The car ran great (previous owner had a tune on it) but the misfire could be felt at idle. The tech lastly advised that I change out the fuel injector to eliminate the 3 most common misfire issues. We did that and the new injector was coded. Since the vehicle now has misfires on all cylinders and when you give it gas it falls on its face flat with the CEL blinking. Now given that is the case, im worst off than when I started. I called the shop that did it and they said that the noticed the tune on the car, but coded the injectors based off oem spec. Could this be my issue? Im assuming that when tuning the injector flow is altered? Sorry im new to the mercedes world. Id love to keep the car, but I dont know if there is something deeper going on that I should return the car as a result of. Thanks for any guidance!

CaliBenzDriver

Getting injectors reset to stock got all cyl. misfiring...

> Initially Cyl.#5 misfire...
is aiming towards being low compression
ie. cylinder walls, bent rod or jammed rings.
Get a bore scope to see that clearly.


> Falling on its face...
suggest fuel starvation as in low pressure
or lean fuel trims LTFT


> Inspect oil filter...
look at oil filter for glitter particles


> Firmware tuning...
Now you have every cyl misfiring !!
Go stock to help you resolve the basic issues
then tune up again


> Look up @PeterUbers 's index for great additional solutions.

PeterUbers

The Sticky

https://mbworld.org/forums/w212-amg/...fixes-diy.html

PeterUbers

I agree - you have to return to stock to get to the bottom of this.

scope those cylinders - specifically cylinder 5 ... 5 takes the biggest beating followed by 1....

lots and lots of discussions on misfires in the sticky and issued exactly as you are describing with solutions.

Elevated

Man, you guys are super helpful. Ive looked up quite a bit and came across thread on cylinder 5 misfire issues. I guess my point is that, if it is low compression, jammed ring, etc... Id be better off returning the vehicle to the seller and getting my money back as opposed to incurring more expenses? Im already in the hole almost 2k. I will get a compression check and borescope to see this thing through sometime in the next few days.

PeterUbers

is this through the eBay guarantee?

if so - yes, get out NOW. Scope the cylinders, leak down test (not just the software xentry test) and show this as proof, and save your receipts from the $2k already spent

Baltistyle

Yes, get out NOW. Don’t look for any other solution.

Elevated

Yes, this would be through eBays guarantee... Thanks Peter! This is bittersweet bc I really loved the car the 350 miles I probably put on it. Ran like a banshee tuned and I had plans to go big turbo on it. Really wish this weren't the case, but oh well. I appreciate your help with this greatly..

Elevated

As a fellow Baltimorean, ill take your word for it!

PeterUbers

It IS a great car but it has to be the right specimen. Find a better car - and do a serious scope and engine inspection on it before purchasing. You got lucky with the eBay guarantee - dodged a bullet

jimyj

It sounds like the issues you're experiencing with misfires after changing the fuel injector could indeed be related to the car's tuning. When a vehicle is tuned, especially for performance enhancements like in your case with the E63S, it often involves adjusting various engine parameters, including fuel injector timing and flow rates. If the injectors were coded based on OEM specifications rather than accounting for the modified tuning, this could lead to a mismatch in fuel delivery relative to what the engine expects under tuned conditions. This mismatch can cause misfires across multiple cylinders and affect engine performance, especially noticeable at idle and under load. Considering the situation, I would strongly recommend running a full system scan using a comprehensive diagnostic tool. There should be fault codes stored in the engine control module (ECM) or other related modules that will provide more insight into the specific issues causing the misfires and CEL blinking. Given the complexities introduced by the car's tuning, it's crucial to use a scanner capable of accessing and interpreting all vehicle systems thoroughly. The youcanic full system scanner, for example, is known for its ability to diagnose such issues comprehensively.