Article by: Paul Axford Applies to: All models with the M30 big six engine (this article was written with a 730i). Note: some variations exist with early renditions installed in e9 and e12 models. The photo below indicates where some of these sensors are located. a) Cleaning the high-tension ignition […]
Topic: DIY Repairs & Mods
Cleaning the Air Flow Meter Potentiometer
Article by: Paul Axford Applies to: all models with the vane style air flow meter (this article was written with a 730i). The AFM is an early-80’s relic from the second generation of electronic fuel injection. This massive sensor sitting dead-center on top of the engine does two things – […]
M30 Power Steering Oil Change (non-LAD)
Article by: Paul Axford Applies to: All models with the M30 big six engine WITHOUT the self-leveling LAD system (this article was written with a 730i). You could do a “one-person flush” the way I did it in the photo with the engine running and a lot of excitement, but […]
ZF 4HP22 Automatic Transmission Service
Article by: Paul Axford Applies to: All models with the M30 big six engine (this article was written with a 730i). The 730 and 735 big six automatics all have the ZF 4HP22 4-speed transmission, which is installed on hundreds of thousands of various European cars. Additional models with the […]
Engine Mount Replacement M30 (I6)
Article by: Paul Axford Applies to: all models with the M30 big six engine (this article was written with a 730i). A vibration felt through the steering while starting the car was my cue that the engine mounts had failed. The replacement procedure involves raising the engine about 5 cm […]
Glove Box Shock Absorber
Article by: Johan Problem: When I opened my glove box it just fell open and dangled forward. Time to replace those gas shocks! There are two in the dash. One is an absorber to make the dash open gently downwards. The other one is a gas shock holding the compartment […]