Ignition coil issue
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Newbie
Joined: Dec 2024
Posts: 7
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Ignition coil issue
A few months ago I changed the spark plugs on my 2014 glk, used new mb plugs from the dealer and indexed them as per the fsm. All was fine until recently the car began to randomly run rough, and threw the code p0351: Ignition coil A primary/Secondary circuit, and P0301 cyl 1 misfire. Shutting off the car when this happens and turning it back on fixes the issue for a while and clears the CEL. I figured it was the coil going bad, so I changed it with a new coil from the dealer. Today it happened again, so I guess it wasn't the coil. Any ideas? Ive heard a weak battery could cause this since cyl 1 is the last to get a signal, how likely it that with no other electrical symptoms?
MBWorld Fanatic!
Joined: Sep 2015
Posts: 2,602
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2013 glk 350
Did you replace the plug boots? When I had my plugs done at 80,000m I was cheap and didn’t do it . I regret it because I had to drive home on 3 or 4 cilinders it missed so bad. Then I had it done .
