I have a 2004 745li smokes blue out of one pipe not heavy. Also one of the vertical cylinder shaped motors or pumps on top of valve cover is leaking oil upwards. Like under pressure. Get codes saying

Kenny Prosser

Asked by Dec 16, 2014 at 03:33 PM about the 2004 BMW 7 Series 745Li

Question type: Maintenance & Repair

Secondary air fuel pump malfunction. Are these
problems related. Please help

12 Answers


what do the cades say and what does the exhaust smell like is it very gaseous

1 out of 1 people think this is helpful.
Kenny Prosser

smells a little of gas not heavy. Codes said secondary fuel air pump relay circuit malfunction. And the other air fuel bank 2 malfunction. Can't remember specifics cause I don't have them in front of me. Sorry will this help?

1 out of 1 people think this is helpful.

does the smoke thin out and go away after the vehicle warms up

Kenny Prosser

I think something to do with emissions

Kenny Prosser

Yes it does thin out and go away. Right away


does your smog pump work


can u send a pic of that cylinder you spoke of

Kenny Prosser

Sure give me a sec. It's under a cover


Blue Exhaust Smoke A clear sign that oil is being burned in the engine is blue smoke coming from your vehicle’s tailpipe. Oil can leak past where it’s meant to be if piston rings or valve guise seals are worn out. This leaking can allow oil into the combustion chamber, where it will be burned like fuel. If you see what looks like blue smoke, be sure to check your oil often and be aware of possible overconsumption that may be occurring. While you should normally seek attention as soon as possible, since internal repairs may be the next step, an older vehicle with blue smoke may not be so crucial; as long as the leak is minimal it can be maintained by topping off your oil regularly.

Kenny Prosser

It won't let me, how?

Kenny Prosser

Ok thank you.


but it would not thin out if it was an oil burner it would blow more whenever you press the gas pedal down

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