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Vehicle Application: 1998 BMW 528I 2.8L 2000 BMW 528IT 2.8L 2002 BMW X5 3.0L, Eng Cfg L6, Eng Des 1999 BMW 528IT 2.8L, Eng Des M52TU M54 2000 BMW 323I Sport Wagon 2.5L Customer Concern: Check engine light is illuminated in dash. Tests/Procedures: 1. Compare the actual engine temperature, as read by an infrared or contact thermometer, to the temperature shown on the scan tool. 2. If the temperatures are comparable, replace the coolant thermostat. A leaking thermostat will delay warm-up and keep the engine from coming up to proper temperature for closed loop operation. Potential Causes: Thermostat

repair manual supersedes our 1996 through 1998 BMW Z3 repair manual with four more model years of coverage and repair information for the Z3 Roadster, Z3 Coupe, M Roadster and M Coupe. With extensive new information as well as revisions throughout, this book is the comprehensive source of service information and technical specifications available for the BMW Z3 Roadster and Coupe.
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comprehensive, single source of service information, technical specifications, and wiring schematics available specifically for the BMW 7 Series from 1988 to 1994. The aim throughout this manual has been simplicity, clarity and completeness, with practical explanations, step-by-step procedures and accurate specifications. Whether you’re a repair professional or a do-it-yourself BMW owner, this manual will help you understand, care for and repair your E32 7 Series. Read the rest of this entry »

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1. Use a scan tool to monitor the fuel trim numbers and the Mass Air Flow (MAF) sensor data stream grams/sec readings. Nominal
values are 5 grams/sec at idle in Park, and >150 at Wide Open Throttle (WOT) and 5000 RPM, in gear. Some scan tools have a freeze frame feature, which is useful in trouble shooting if the problem is set at idle versus at cruise. Vacuum leaks and crankcase breather problems generally show up at idle. Voltage at the airflow meter should be .7-.9V at idle and increase from there with more airflow. 2. Monitor the crankcase vacuum with a vacuum gauge, which can be adapted onto the tube for the oil dipstick. Specification for the crank case vacuum is 8 to 15 millibar, this equals about 1/4 to 1/2 PSI or pounds per square. So, 1 PSI of vacuum would be twice as much as there should be at idle. The proper method, per BMW, is to use a slack tube manometer which can be made easily with clear tubing and making it into a U shape and have it marked in inch increments then half fill it with water. When crankcase vacuum is applied to one side of the tubing it should displace 4 to 6 inches of water if the crankcase breather is working correctly. 3. Monitor the fuel pressure. It should be a constant 50 – 53 PSI.

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Fig. 10: Rear Compartment & Accessories (Cont.) Fig. 11: Rear Compartment & Accessories (Cont.) Fig. 12: Power Window (2-Door) , Fig. 1: Engine Compartment Fig. 2: Engine Compartment (Cont.) Fig. 3: Fuse Block & Underdash Fig. 4: Fuse Block & Underdash (Cont) 42318 byte Fig. 5: Underdash (Cont.)51521 byte Fig. 6: Underdash (Cont.) & Instrument Panel , Fig. 7: Underdash & Instrument Panel (Cont.) , Fig. 8: Instrument Panel (Cont.) , Fig. 9: Rear Compartment & Accessories ,