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Rough idle and poor gas mileage could be a sign of worn VANOS seals. Many M52 engines need to do a VANOS reseal after about 120k, sometimes sooner.
This car has fuel pump relays for bank 1 and bank 2. Check for fuel delivery at both banks.
Does your vehicle have factory navigation? I've seen mysterious battery drainage problems that lead back to the navigation module in the luggage compartment. You can unplug it and see how it affects your battery issues. Good luck.
The accessory belt idler pulley can make whistling noises, especially at start up. If it's not coming from the front of the engine, and sounds more like from the top of the engine, then it could be the intake manifold runner valve, but that one would affect engine performance.
The auxiliary fan and electric water pump are common failure points on this BMW. As previously stated, a shop with a BMW specific scanner should be able to confirm.
The E36 and E46 BMWs have problems with not only the subframe bushings, but the entire rear suspension can separate from the subframe. This is very common on M3s that tend to get launched very hard off the line and/or downshifted from speed. The repair is available in a kit that is welded into the subframe. The rear suspension is then reconnected to the new mounting position.
There is a resistor that controls the blower speed. It is a commonly replaced item on many vehicles. It is located behind the glovebox attached to the blower motor. A good shop that handles many Euros should be able to take care of that for you. Good Luck, Euro-Asian Motorcars, Inc. Edison, NJ
Hello, the car carries two front engine mounts that list for $142 each plus a transmission mount that lists for $49. Labor to install all of these parts is about 4.2 hours.
Hello, the airmatic suspension control module is located in the fuse and relay box, left side of engine compartment. To replace it, the battery should be disconnected. After installation, the module needs to be calibrated using the dealer's STAR diagnosis system.
Hi, your '04 530i has two drive belts - one for the altenator, water pump, and power steering; and another one for the A/C compressor. Both belts have associated tensioners and pulleys that can wear out over time causing noisy operation and loss of tension on the belt.