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My Z4 recently started taking longer to start on cold starts and I'm trying to figure out the cause. This happens on most cold starts. But, not every cold start. Sometimes it fires right up even though it's cold.
2013 35i with Dinan Stage 3 tune. No other mods.
The battery is strong (less than 1 year old). It cranks normally but just takes longer than it should to actually fire up and start running. Once running, it runs smoothly. On warm starts, it starts promptly like it should.
Thoughts? My thinking…
Bad tank of gas? (Could be coincidence but this seemed to start the first cold start after filling up)
Ignition coils/spark plugs need to be changed? (Pretty sure these were done within the last 2 years)
HPFP? Were those a problem on later model year E89s?
Thanks all!
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