For a while, the car has been doing what I can only describe as a choked/hesitant startup. Typically, when the car is warming up or warmed up, sometimes from cold start.
I have 2 minor vacuume leaks confirmed by a garage, from the exhaust cam position sensor gasket/seals on bank #1 and #2, but the garage said they don't think that would be the cause.
Thinking logically, I had a code: 00272C - DME: Additive mixture adaptation, bank 1 & bank 2- control limit reached.
In my mind, vac leak would be affecting the fuel to air ratio and possibly causing this?
Misfire Issue:
I had a misfire logged in cylinder #5 about 2 months ago. As far as I can tell, they all have NGK plugs, but I replaced #5 with a Bosch and also replaced the ignition coil with a new Bosch one. This fixed it for about a month and now the misfire has come back in the same cylinder.
From my own research, Bosch plugs are sometimes questionable, and that NGK are the spark plugs to use, but you can't believe everything you read on the internet.
Could this possibly be causing the misfire?
Additionally, would the vac leak mentioned above be causing a misfire?
I'm unsure on that as you'd think it wouldn't only be affecting one particular cylinder.
Any help and advice would be greatly appreciated
Many thanks
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Monday, February 3rd, 2025 AT 9:54 PM