Quote:
Originally Posted by E90 M335i
Rough cold starts are almost always related to injectors as they can leak a bit overnight and when you go to start the extra fuel doesn't burn right away. As soon as it burns, the car is back to normal. I would look at those injectors closely. You don't wanna be messing around too much, if one of them is leaking, it can break down the oil and cause cylinder scoring and other bigger issues.
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Even if the rough running doesn’t start until 30 seconds after starting? And I’ve done an injector leak test with ISTA which was clear