99lightning

I got on my car part throttle up a hill through the gears and then it felt funny got a cel, scanned it at home and had random misfire codes for cyl 4 and 7 cleared them drove it and it was fine. Is this a sighn of bad coil packs?

Hulk

Check your coils and wires
Did moisture get in the engine bay?

Sir-Boost-a-Lot

iTrader: (1)

Probably wires way before coils. If they're the originals, get new MB or Bosch ones.
Are you running the stock injectors still?
How many miles?

jcjmw

check the connector to the coil. Sometimes they work them selves loose. You could also swap the plugs, wires and coils with another cylinder and see if the cel comes back.

99lightning

cool thanks, it has 61,000 on them maybe a couple are loose from the header install last year I hardly drove it since. injectors are stock as well. if it happens again I will hook it up to star.

actech

i had similar misfire codes. i had new plugs with only 500 miles on them and it turned out to be the plugs. two were torched. replaced all and runs like a champ. check plugs

99lightning

I will check the wires then get more gas into the car and see if it happens again.

AgSilver

I started a thread in this very same issue (https://mbworld.org/forums/w211-amg/...der-113-a.html) and it remains a mystery still. To date there has been no re-occurrence over the last 1000 miles and the engine has been functioning flawlessly.

novae500

coworker got P0300 and P0301. Car was idling rough and after 60mph, it would fall on its face and get the codes. Decided to put fuel injector cleaner and tank of gas at a different place and no more codes and idling alot smoother than before.