Bmw air injection pump problem...HELP!

ok,
all fuses good.
glow plugs test okay.
all filters good. fuel and air
fuel pumps all primed.
try test fuel? using a spray bottle with diesel in it ,past air cleaner point. if that works (runs)for say 3 seconds, the injectors are not injecting fuel.

starter bendix is probably bad or it has stripped teeth on the flywheel. the acceleration problem sounds like you were in limp mode

Your AC pump is starting to faiL. It's starting to bind and putting heavy back pressure on the belt causing it slip and screech. After the car cools off inside, the load on the AC compressor is lower and the sound will die down. Also when the belt gets hot it gets a little more flexible and grippy which also lowers sound.

Take it to an auto AC repair place and have it checked.

These pumps are notorious for failing, replace it and make sure all the hoses to and from the pump are in good condition, replace any that seem deteriorated.

well it may help if you open the hood, then start the car and see if that helps you locate the item which is whistling. many cars have a power steering pump which likes to whistle until it gets warm. generally this is less than 5 minutes, and that is more like a screeching sound. something is either blowing out or sucking in through a small orifice to make the whistle, you need to physically locate the source of the sound. many bearings are in there spinning and any of them can be doing a cold screech.

myself I have been know to use a BFS, which is a big long screwdriver, i touch the pointy end to each of the spinning components and put the handle end to an ear. yes this process is not suggested for people with long hair or just no damn sense. but as i move the pointy end from component to component i know immediately when i touch it to the screechy one.

IT COULD BE DIRTY PARTIAL STOPPED UP FUEL INJECTORS.STOP UP FUEL FILTER AND AIR FILTER.ALSO BAD SPARK PLUGS CAUSES MORNING STARTING PROBLEMS.

1997 BMW 328I 2.8L Customer Concern: MIL is on with trouble codes P1421 and P1423, for incorrect secondary airflow on both cylinder banks. Tests/Procedures: 1. Perform a functional test of the Air Injection Reaction (AIR) system. Tee a vacuum gauge into the vacuum hose attached to the diverter valve, located on the cylinder head towards the front of the engine.

2. Allow the vehicle to sit over night. Start the engine (cold) while monitoring the amount of vacuum on the gauge at startup. At temperatures from -10 to 40 degrees Celsius, there should be at least 17 inches of vacuum. At the same time, the AIR pump should run and pump a large volume of air into the exhaust. Potential Causes: A.I.R. Pump
Air Pump Relay
Restricted Cylinder Head
Diverter Valve
Tech Tips: These codes are related to a problem detected in the Secondary Air Injection system. Scan tools with BMW software include a feature to command the AIR pump on and off. The pattern failures for these codes are the AIR pumps due to leaks in the diverter valve and moisture or condensation in the AIR pump.

Possible fix but not all items. Just areas to look at:
Confirmed Fix - A.I.R. Pump - A.I.R. Diverter - A.I.R. Pump, Air Injection Reaction Diverter (AIRD) Valve - Air Injection Reaction Diverter (AIRD) Valve - Check Valve, Secondary Air Pump - Diverter Valve Vacuum Lines

its your secondary air pump. it turns on in the cold morning to inject more air into your exhaust, something about emission. its normal to be high pitched. once on my car it was way loud, i looked and the hose had disconnected. either way its normal if its not super loud. but if its everyone is looking at me loud then check for loose hoses!

The clear line will be your fuel line.The pump would normally keep pressure on your injectors and consequently has no air. There is a non return(check) valve in the pump to keep fuel at you injectors. Sounds like this has failed. New or 2nd hand fuel pump required

that is the egr valve, the car needs it in order to start efficiently. u do not need to worry about this it is normal on bmw, it depends on the climate