How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Roy Your Own Question
Roy, import/domestic specialest
Category: Car
Satisfied Customers: 4470
Experience:  ASE master tech for 40 years
Type Your Car Question Here...
Roy is online now
A new question is answered every 9 seconds

740 IL: My 1999 BMW 740 IL gives multiple misfire codes, 0303,

This answer was rated:

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 2 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.

Roy and other Car Specialists are ready to help you