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Roy, import/domestic specialest
Category: Car
Satisfied Customers: 6185
Experience:  ASE master tech for 40 years
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740 IL: My 1999 BMW 740 IL gives multiple misfire codes, 0303,

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My 1999 BMW 740 IL gives multiple misfire codes, 0303, 0307, 0308. checked the spark plugs in cylinders 3, 7, and 8 found them wet with oil, replaced them, the same thing happens. The engine is smooth at idle.
You can hear a miss when driving away. What is happening?

good morning my name is XXXXX XXXXX I will assist you today


Did you replace the coils as well??? found many of them failing. I always recommend them when replacing the plugs especially with multiple missfires such as yours.



Customer: replied 3 years ago.

I switched coils the same thing happens at the same cylinders.

ok, then it is time to start with basics. I would remove all the plugs and start with a compression test on all cylinders.

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