Misfire due to bad #6 ignition coil?
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Lincoln
Misfire due to bad #6 ignition coil?
Hi folks,
I'm gonna pull the trigger on a 2015 E63 AMG S (black on black) from a non-MB dealer. It's a one-owner and low miles. It has clean carfax except that it has done some repair at a local shop (July of this year). So I called them to figure out what was it. They said they replaced the #6 ignition coil due to misfire. Is this a red flag? Also, I'm having hard time to purchase extended warranty for this car because it's out of factory warranty already (called Jeff and he's been super helpful providing me all the information though he couldn't sell me the warranty). Route66 only sells 1st street coverage for AMG (is this good enough?).
Btw, please also recommend good maintenance/repair shop for AMG in the greater Seattle area.
I'm gonna pull the trigger on a 2015 E63 AMG S (black on black) from a non-MB dealer. It's a one-owner and low miles. It has clean carfax except that it has done some repair at a local shop (July of this year). So I called them to figure out what was it. They said they replaced the #6 ignition coil due to misfire. Is this a red flag? Also, I'm having hard time to purchase extended warranty for this car because it's out of factory warranty already (called Jeff and he's been super helpful providing me all the information though he couldn't sell me the warranty). Route66 only sells 1st street coverage for AMG (is this good enough?).
Btw, please also recommend good maintenance/repair shop for AMG in the greater Seattle area.
Last edited by hardyli; Oct 6, 2020 at 07:42 PM.
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From: Houston Tx
2014 AMG E63S and 2020 AMG GTC
check out https://www.extended-vehicle-warranty.com/
Its what I have. They've been good to me...
Its what I have. They've been good to me...
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Very very common to need to replace ignition coils on this engine around 30-40k miles, not a red flag; also have them consider replacing and indexing all the plugs and replacing all the rest of the 7 coils.
heres a video of my DIY for coils
https://mbworld.org/forums/w212-amg/...ml#post8073603
also - ask them if the car is tuned, I suspect it may be.
heres a video of my DIY for coils
https://mbworld.org/forums/w212-amg/...ml#post8073603
also - ask them if the car is tuned, I suspect it may be.
Last edited by PeterUbers; Oct 7, 2020 at 11:05 AM.
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Lincoln
Very very common to need to replace ignition coils on this engine around 30-40k miles, not a red flag; also have them consider replacing and indexing all the plugs and replacing all the rest of the 7 coils.
heres a video of my DIY for coils
https://mbworld.org/forums/w212-amg/...ml#post8073603
also - ask them if the car is tuned, I suspect it may be.
heres a video of my DIY for coils
https://mbworld.org/forums/w212-amg/...ml#post8073603
also - ask them if the car is tuned, I suspect it may be.
Out Of Control!!
Joined: Jun 2004
Posts: 13,799
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
OH nice! Thanks for the information. Seems not hard for DIY. So I'm gonna do all the rest 7 myself. They wouldn't know about if it's tuned or not as they got the car from an auction. The only way to find out is to bring to a dealer for PPI? If it's tuned, then it's more likely to misfire and require the replacement of ignition coils?
inspect the ecu to see if it's been opened .. there is a silicone seal that would be evident sometimes that's more sloppy by some tuners; the dealer will be able to tell you or a tuner will be able to tell you when they inspect the ecu data
time it -- 0-60 and 1/4 mile ... and compare to stock
Out Of Control!!
Joined: Jun 2004
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
If tuned and running lots of boost more likely to misfire also the tune taxes the spark plugs and the coils more than the stock tune. Also bad gas can cause misfires
also... colder plugs with narrow gap can reduce misfires on an aggressively tuned engine
also... colder plugs with narrow gap can reduce misfires on an aggressively tuned engine
Last edited by PeterUbers; Oct 7, 2020 at 01:27 PM.
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Lincoln
Thanks! I will take the car to MB dealer for PPI then. If it's tuned, I won't purchase it.
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C63 Vert
Check out some of the misfire posts. Often it happens on the front two cylinders. There were some valve issues. It seemed like they weren't fixed and MB may know of them. If it is just a coil. It's not a big deal. I would imagine these could misfire stock. Mine stock if I pushed it before the colder spark plugs it would also buck a bit.
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