BMW missfire when cold.

[KoooSHAX]

Hello everyone!

Last month Y buyed BMW 735i 2002.

It has a problem, it missfiering when it is cold.
When Y warm up the engine for 5 - 10 min. it is fine and everything is working fine, no loss in power, no rpm jumping, no vibrations, works like new when it is warm.
Missfiering only happens with 6. cylinder.
Changed spark plugs, changed coil for 5 times no result. Maybe injector? But why only on cold engine?

Thank you for your replies.
Sorry for my english.

[jclausen]

Swap the injector position

[cazal740i]

Hello everyone!

Last month Y buyed BMW 735i 2002.

It has a problem, it missfiering when it is cold.
When Y warm up the engine for 5 - 10 min. it is fine and everything is working fine, no loss in power, no rpm jumping, no vibrations, works like new when it is warm.
Missfiering only happens with 6. cylinder.
Changed spark plugs, changed coil for 5 times no result. Maybe injector? But why only on cold engine?

Thank you for your replies.
Sorry for my english.

Try using Liqui Moly Fuel injectron for a few full tank cycles..