[Rossybrown]

My 145,000 mile 530d has gradually developed a smoking habit over the past 20,000 miles. The engine and turbo were replaced with new at 97,000 miles and she has been run on LL01 oil ever since, serviced every 10-15,000 miles, doesn't use a drop of oil and gives a nice 40mpg when sat at 85mph.

What causes the black brown smoke on 3/4 to full throttle? I suspect over fuelling as if I snap the throttle open the problem is worse.

Is there a cure?

Thanks in advance

Ross

 

[RichardP]

Quite a few posibilities, first candidates would be air filter and/or MAF sensor and injectors. Some smoke is normal without a particulate filter on the exhaust.

 

[Ronnie]

What is the performance like? does the car still pull well or has there been a drop in power?

 

[Rossybrown]

She still pulls very well, but leaves a smog behind it doing so!

 

[Ronnie]

Try disconnecting the MAF plug and driving the car, if it goes better you need a MAF, you may be OK though as you have good MPG but worth a go, otherwise have the fault codes read for the engine