Hi it seems like an air leak in the intake manifold. Check all the vacuum lines around the throttle body and the brake servo line. A small leak will cause the throttle to fluctuate, and also affect the fuel trim. You may also need to clean or replace the throttle body. Good luck
SOURCE: CHECK ENGINE LIGHT CAME ON P0171 FUEL TRIM BANK1 SYSTEM TO LEAN.
Hi. You need to clean the Mass Air Flow Sensor.
This is an easy job.
Get a can of throttle body or brake cleaner spray at your local auto parts store.
Open the hood, and locate the air filter box. follow the tube from the filter box towards the engine. Look for a small black box with 2 screws holding it to the air tube, Remove the wire connector and observe inside the sensor with a flashlight. You will see 2 small wires, and they will appear fuzzy or dirty. Spray the interior with the cleaner until the wires are nice and clean. Do not use compressed air, you will damage the sensor. Put it all back together and drive it.
This will def fix your issue. This is a vey common problem. If you do it yourself, you will save 70 + bucks.
Thanks for choosing FixYa, and a FIxYa rating for my assistance would be greatly appreciated.
SOURCE: bmw 318i e46 idle bad
try disconnecting the air mass meter sensor if it runs better then ur air mass meter has failed had the same problem
SOURCE: Need Fuse Map Diagram BMW 318i 1993
check the internet for a bmw e36 ETM ( electronic troubleshooting manual) everything you need is there.
SOURCE: removal and replament of a 3 Series BMW E46 1998 saloon wing mirr
On the inside trim, you can remove screws that are by the door handle, arm rest, under door and side of door and then gently pull back on the panel as there will also be retaining clips attached and you don't want to break them. You'll need to lift the door panel upwards in order to get it off the window ledge. Then you'll need to manipulate the panel and disconnect the door handle linkage from the door handle and disconnect the wiring for your controls. Then you can access the bolts that secure the mirror onto the door
SOURCE: i have a bmw 318i e46 and she keeps overheating
replace the header tank...common problem with these.....get from dealer, less than 100 quid....also check the cooling fan is working as this causes the tank to split if it is not....not so cheap and complex to repair
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