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2008 BMW 735i Questions & Answers
When running it misses and losses power
If it has not been tuned up within the past 6 months start there.Make sure the ends are seated correctly as well. If you start it at night with the hood up, look for arc over from the ignition components, and plug wires. Replace any plug wires that show arcing. You do not mention year, but if you have coil blocks instead of distributor look closely at the blocks in the dark with engine running for corona or arcing- replace any that show any signs of it. If you have the distributor still, check for corrsoion and carbon tracking the cap.If the condition persists, look at the fuel system. Fuel filter should be replaced with the tune up, or if tuned up recent, replace filter. Check fuel pressure to make sure it is adequate. Mke sure fuel tank is vented as well.
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