Hello community I am a new owner and member here. Love the forum! I have spent many hours reading all the great tuning tips here and plan to tune mine soon as well. I recently purchased a 2016 E63 AMG S with 31,000 miles. The car seems to run perfect and I had a PPI at a local dealer Mercedes before purchase. Is was all clear from Mercedes.

The issue: I have done a few 60-140 runs and the car ran perfect. Yesterday I did a 60-130 and it stumbled at 130 and went into limp mode. I think it was a misfire, but could not hear it clearly. In limp mode when I would touch the accelerator, it would vibrate so bad I thought I had broken something major, but once I stopped and restarted, it runs perfect. I have not had a problem since, but have not done a 60+ run since then.

The car is all stock as far as I can tell and I had good 93 octane from Costco in it. What for you guy think I should be looking into?

Thanks for any replies!

Hi and welcome -- sweet whip!

did you get a CEL? If not, we need to pull codes to known for sure. Check the sticky for lots of discussion on this (compilation of E63 issues).
PeterUber's Sticky for 2012+ E63/S issues

Is the ECU tuned? Just cuz you had a PPI doesn't mean that it is not.

The coil packs are weak on this car, they may need to be replaced, or at least the ones closest to the turbo (lots of heat)
Peterubers write up and video on coil pack replacement DIY

You may need new plugs if tuned, they recommend every 10k miles -- i know, you said it had a PPI, just make sure it wasn't tuned

Also -- bad gas can give you knock/misfires. We are starting to see winter blends of fuel now

The engine code will be important here. Do you have an obd scanner/reader or icarsoft?

Once we know more we can better advise you.

Also were you low on fuel? Hard runs while low on fuel will challenge the LPFP/HPFP and causes some limp mode sometimes

Thanks Peter. Great info! My scanner just got delivered today, so I will be checking codes shortly.

happy to help! Lemme know what you find

also new plugs are never a bad idea on this car ... stock plugs and stock gap

2016 E63 AMG S - The issue: I have done a few 60-140 runs and the car ran perfect. Yesterday I did a 60-130 and it stumbled at 130 and went into limp mode. I think it was a misfire, but could not hear it clearly. In limp mode when I would touch the accelerator, it would vibrate so bad I thought I had broken something major, but once I stopped and restarted, it runs perfect. I have not had a problem since, but have not done a 60+ run since then.


I have not had a CEL on this car
I was not low on gas

These are the codes. Car had no codes last week.

P0300 (Random Multiple Cylinder Misfires detected)
P0301 - #1 misfired
P0307 - #7 misfired
P0308 - # 8 misfired
P0303 - #3 misfired

I am thinking of running out the current gas and refueling before I do another test run. I guess I will change the plugs also to be safe since I just got the car.

As far as coil packs, Should I change all or just start on the turbo sides for now?

ok just what we thought.
misfires

so you are probably knocking lower in the Rpms

coils first. Change all 8. You can do that yourself quick
fcpeuro has parts made by oem Beru

fresh gas also a plus

we will get this fixed, plugs with perfect indexing will be last step.

Thanks! I will get this done asap!

Do not use Costco gas for your 5.5tt engine. I recommend using either Mobile or Shell only, no Arco gas.

Agreed -- I would burn the tank of gas and then refill at a reputable station; not sure Costco is known for their high quality gasoline. When i first bought my car, it misfired twice in a similar manner. Burned through the dealer-filled gas and then refilled at a major brand station, never had the issue again, even after being tuned. So Id try that before replacing parts - cheap and relatively low effort on your part.

Definitely get this addressed before tuning (if it is not tuned...as noted above). I'd change out the spark plugs prior to tuning as well anyways. Best of luck.

Yes I think it was the Costco gas. I refilled today at Shell and don't see any misfires so far. I have already ordered the coils and sparkplugs so I am going to change them anyhow to be sure what I'm working with.

new plugs and coils is a small investment in lots of happiness with the m157 engine - I support this and dont look back, also a fresh oil change

Good deal!

Question, not sure how recent your purchase was, but since you had the dealer (Mercedes) do a PPI and assuming it was a CPO purchase, I would bring it back to the dealer, tell them about the problem and Peter’s recommendations and have them change them out under warranty or at lease recent purchase replacement.

Good idea, but I purchased from a Land Rover dealer, not Mercedes. I think it is out of warranty due to the year, 2016 anyhow. The good news is that I'm pretty sure it was just the gas. I went on a long drive today after refueling with Shell gas and I didn't get any codes. Trust me, it would have had codes if there was an issue the way I drove it! I'm still changing the plugs and all coils since I plan to tune soon.
Interestingly after today I'm starting to wonder if mine may have a tune already because the MPH limiter appears to not work on my car. Isn't it supposed to limit at 156?

186...

You are right, I was thinking of the non S model.

Or 175. There are two limiters and seemingly no no logic in which cars get what limiter.

Prior thread on this

Running on low fuel may give a chance for the gas pumps in tank to fail so no fuel also in the high pressure. Check your fault codes for fuel system components. I had the same thing when i was on low fuel the car made a big missfire after it knocked for a second and then the engine stoped. When i tried to start the car i noticed that the fuel pump was hearing dry. Soon as i get the car on a ramp i tried again i heard the pumps that was sucking fuel. The car started perfectly and the next day i changed the main pump in tank. I hope this helps you

Hi all,
2014 E63 AMG-S 4WD.

Have a Wistectune on it - we tried a couple of maps and still happening even without it so I know it's not the tune.


Here is the issue - vehicle runs awesome normally, accelerates, no hesitation no misfires. perfect.
Floor it, hits 6-7+ K RPM starts misfiring like crazy and continues to misfire - have to pull off, turn the car off and back on and then it's back in business NO PROBLEM..

Replaced all the spark plugs and ignition coils but still it misfires…..

Any ideas are welcome.

​​​​​Remove the tune, been reading a few horror stories with weistec tunes. Did you do a compression check and leak down test? How many miles on the car? Have the spark plugs been indexed when installed and or gapped properly?

Car has 57k miles on it and there is no leak down
the spark plugs have been installed right and
coming to the tune the tuner has double checked if the tune is causing it but he said it’s not
and the guy who installed spark plugs stated that it might be happening as the temp is too hot outside

what do u think…

Is your intercooler pump working? How high are your intake air Temps getting?

How to check if intercooler pump is working or not

how to check air intake temps…

Would need to log a run and see how high the temps are getting. Can also do a pump rewire to make it run all the time and see if it helps. The ecu doesn't kick the pump on until intake temps reach a certain temp, rewiring it to run all the time will keep intake temps cooler to begin with