Electrical System Problems of BMW Z4 - part 1. BMW Z4 owners have reported 46 problems related to electrical system (under the electrical system category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of BMW Z4 based on all problems reported for the Z4. Considering picking up an 2004 E85 Z4 3.0 - 6M, Sport Package, Really nice shape. I am aiming to go look at the car tomorrow and am putting together some thoughts of questions to ask and common problems I should look out for and plan to resolve if I buy the car. The list I have going so far: Water Pump Failure Common. Cooling System in General. There are some major differences between the Z3 and E85 Z4, there are also some subtle differences between the Z4M and non-M as well. We will be following this rebuild up with an identical process on Lee's 3.0si coupe so you should get to see all the differences. Z4 E85 3.0 - 2005 - will not start! by knmstag » Thu Jul 22, 2021 12:52 pm. My son Ryan has a BMW Z4 E85 3.0 (2005). He loves the car, but we have not been able to get it started for a couple of weeks now! I have checked the battery, alternator and starter motor, and all is OK. I have checked fuses & earth connections, and still no joy. by srhutch » Thu Apr 30, 2009 10:25 pm. This post is to make owners of 2.5i, 2.5si and 3.0si Z4's about a known issue with the N52 engine (so also affects 3 Series etc) and the HVA's (Hydraulic Valve Adjusters) I have collected my car today from the dealer after having a complete new Cylinder head and internals replaced at a cost of over £ bmw z4 e85 BMW N46B20 engine reliability, problems and repair N46 is next generation of 4-cylinder inline engines appeared after N42B20 . 2-liter N46B20 version turned out to be the most powerful motor among all N46 engines. I was looking at the E46, probably a 2001 knowing it is the same as the E85 essentially. In the process, I learned of the dreaded subframe issue in which look at video!! the entire rear of the car has structural cracks. Logically, I began wondering if this is something that has been reported in the Z4. It seems like it would be a permanent fix. Here is the narrative: "Z4 Sticky Steering Fix. There is an eccentric ring between the steering column and steering column electric motor. That eccentric ring is there to adjust the play/distance between worm gear (electric motor) and spur gear (steering column). Vay Nhanh Fast Money.

bmw z4 e85 common problems