Re: 745 E65 M62 engine misfire
The car ran very good except for the blue smoke on startup and when the SES light came on due to failed coils/spark plugs which caused rough idle.
Next week my engine with 55,000 miles will be replaced due to flaking of the no.1 cylinder which caused a cracked spark plug and burned coil, low compression, and failure of the no.8 spark plug. Symptoms included blue smoke at startup, oil usage, and SES lights. For those of you that have had engine replacements, please provide advice on what potential problems I should look for or possibly expect. Your wisdom will be greatly appreciated.
You may want to analyze the techís write up which may give you more insight to your problem. Good luck!
Technician write up
For cyc.1 misfire with cutout, cleared fault and test drove and fault came back, swaped out coil with #2 and fault still in #1, pulled spark plug and found spark plug to be corroded. Replaced all spark plugs and fault still in cyl 1, swapped fuel injector with #3 and fault still in 1, pulled #1 spark plug and found to be oil soaked, checked engine vacuum with slack tube and had a major leak, pulled throttle body and found excessive oil in intake, pulled both valve covers and checked for damage on oil seperators which are built into the valve covers and no problem was found, ran compression test and all cylinders pass but 1 was a little low, submitted PUMA case and was instructed to check the eccentric shafts per bulletin, R&R both valve covers again to check shafts and had already been replaced, also checked for sludge build up all looked fine, then performed a cyl leak down test on all cyls and 1 was excessive and could hear a leak when pulling the dip stick out, then checked bank 1 cylinders with a bore-a-scope and found pitting and scaling in #1 cylinder, PUMA responded to replace the engine. After replacement topped of all fluids performed ARS startup procedure and cleared fault memory.