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I noticed my GLC running a little funny. Just seemed like the car wasn’t smooth at all. Went in and changed the spark plugs the other day. Ooooo was I in for a surprise lol. Not sure why but Mercedes theme for this car was 10lbs of s**t in a 5lb box. Had to disconnect the fuel pump on the odd cylinder side. On the even side brackets and a lot of electrical components had to be disconnected.
Keep in mind this is done at 12,500 miles.
I didn’t take any pics as I was frustrated with the damn thing. I did find that the OEM plugs are running fairly cool at #8.
As for my spark plugs... car was definitely running very lean... I know it has to do with the power I’m pushing combined with lack of fuel pressure or maybe running e85 blended fuel and 100 octane pretty often..
I’m going to drive for 3,000 miles and pull the front 4 out and check them again down the road and compare how the new HPFP is helping to run less lean.
Id recommend to anyone running a stage 2 tune to change the plugs at 12,000-15,000 miles as I’m sure yours may be looking like these even if your not flashing low pressure fuel CEL. It’s just a cautionary step as I know of 2 GLC that have blown their motors and interesting enough those 2 were the only ones to blow the m177 motors in the world.. 1 with a simple stage 2 tune (I won’t mention the tuner) and 1 that was fully built but neglected basic maintenance.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
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