We do have a BMW expert Doc Hagerty, but I will try this one. Your 2 P01188 and 1189 are fuel system related codes as far as I can tell, BMW seems to try to confuse things a bit, I recommend pressure testing the fuel system and the fuel pressure regulator. P1030 I can't find if it is an actual code, it's a BMW factory code, not yet released to the wild. Here's the by the book method of testing:
Page 1 of 2
NOTE: For fuel system pressure testing, see BASIC DIAGNOSTIC PROCEDURES article.
Fuel Pump Relay
Remove fuel pump relay. Apply battery voltage to relay terminals No. 30 and 86. See Fig. 36. Ground relay terminal No. 85. Voltage should now exist at relay terminal No. 87. Replace relay if it does not work as indicated.
NOTE: If relay does not work on vehicle, check battery feed, DME master (main) relay, DME/Motronic control unit and ground circuits going to fuel pump relay. See WIRING DIAGRAMS article. Only sockets No. 2, 4, 6 and 8 are used by relay.
Fuel Pressure Regulator
As operating mode of engine varies, so does amount of fuel it requires, ranging from low at idle speed to high at full throttle. This requirement is set with the help of pressure regulator. Pressure regulator governs fuel pressure, controlling it between low and high to suit requirements. Fine adjustment of fuel injection quantity is performed using fuel injection period controlled by DME. Vacuum in intake manifold provides load connection for pressure regulation. This vacuum is applied to diaphragm in pressure regulator. At idle speed or when coasting, a vacuum develops in intake pipe. Fuel pressure reduces by this amount, starting from nominal value. Nominal value is embossed in housing of pressure regulator. At full throttle, intake pipe is approximately zero and pressure regulator controls fuel pressure to nominal value embossed on housing.
1. Remove fuel pressure regulator. See REMOVAL, OVERHAUL & INSTALLATION article. Note code number and nominal pressure on fuel pressure regulator body. Install BMW Service Tester (133060) with connecting hose (133064) in fuel feed left line. 2. Remove fuel pump relay. See DME & FUEL PUMP RELAY LOCATION table. Connect jumper wire between relay base terminals No. 30 and 87. Read off fuel injection pressure on pressure gauge. 3. If fuel pressure drops rapidly, seal return line (upper line) with Clamp (133010) and briefly operate fuel pump. If injection pressure in now stable, pressure regulator is defective. If injection pressure drops, check for leak in front of pressure regulator.
Fuel Pressure Check (Lack Of Power)
Run engine at idle and check fuel pressure. See FUEL PRESSURE REGULATOR. Disconnect vacuum hose from fuel pressure regulator, simulating wide open throttle. If fuel pressure does not increase 5.8-10.1 psi (.40-.71 kg/cm2 ), replace vacuum hose and repeat test. If fuel pressure still does not increase, replace fuel pressure regulator.
Fuel Pressure Check (Hard Start)
1. Run engine at idle then turn off. Note fuel pressure. Note fuel pressure again after 20-30 minutes. If fuel pressure decreases by greater than 7.2 psi (.5 kg/cm2 ), turn engine on, wait for pressure to stabilize, then turn engine off and immediately clamp off intake line near pressure gauge with Clamp (133010). Note fuel pressure. Read fuel pressure again after 20-30 minutes. 2. If fuel pressure drops by less than 7.2 psi (.5 kg/cm2 ), check for fault in fuel supply lines, in-tank supply hose, or defective non-return valve in fuel pump. If fuel pressure again drops by more than 7.2 psi (.5 kg/cmcm2 ), replace pressure regulator.
Fuel Pressure & Volume
1. To check fuel pressure, install BMW Service Tester or DIS tester with connecting line and "T"Section (13 3 064) in the fuel delivery line between fuel filter and pressure regulator. Fuel in fuel lines is under 44 psi (3 bar) pressure. Catch and dispose of escaping fuel. See FUEL PRESSURE & DELIVERY PERFORMANCE table. 2. Disconnect fuel return line. Attach an extension hose. Place hose in Measuring Glass (133020). Remove fuel pump relay. Apply battery voltage to relay base terminals No. 30 and 87. See Fig. 36. See FUEL PRESSURE & DELIVERY PERFORMANCE table.
Wednesday, October 13th, 2010 AT 11:18 PM