bmw 325i misfire


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2002 BMW 525I 2003 BMW X5 2001 BMW Z3 Roadster Check engine light is on.

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Filed Under (BMW) by admin on 11-06-2010

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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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2003 Jeep Grand Cherokee 4.0L Multiple Cylinder Misfire

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Filed Under (Jeep) by admin on 03-10-2010

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may experience an incident of engine misfire during certain vehicle operating conditions. The misfire may occur when the vehicle is operated between 80 – 112 KPH (50 – 70 MPH) and under light loading conditions, e.g. slight uphill road grades. This condition may occur at all ambient conditions, but is more noticeable when ambient conditions are less than 0°C (32°F). If the vehicle is equipped with On-Board Diagnostic (OBD), a MIL illumination may also have occurred due to Diagnostic Trouble Code (DTC) P0300 – Multiple Cylinder Misfire. Various single cylinder misfire DTC’s may also be present. If the frequency of misfire is high the Powertrain Control Module (PCM) may place the engine in “Limp-In” mode. The misfire condition may be caused by one or more engine exhaust valves that are slow to close. Late closure of an exhaust valve may be the result of no valve rotation and associated build up of carbon on the exhaust valve stem. This condition may occur when the engine is not allowed to run at engine RPM’s that are greater than 3,200 RPM. At 3,200 RPM or higher the engine exhaust valves will rotate if not impeded by high carbon deposits. Low engine RPM’s and high carbon deposits are associated with short trip driving where the vehicle engine is not allowed to fully warm to normal engine operating temperatures. Cold ambient temperatures will increase engine warm-up time and add to the opportunity of carbon deposit build-up on the stem of the engine exhaust valve. Verify that an engine misfire condition is present. Use of the DRBIII(R) during a road test, or a Co-Pilot data recording, may help to determine engine misfire and misfire counts. If carbon deposit accumulation is severe, then a cylinder leak down test may detect one or more cylinders leaking greater than 15%. Save any misfire DTC Freeze Frame Data that was stored for later misfire correction verification. Verify that the engine misfire condition is not caused by faulty engine mechanical or electrical components. If the engine mechanical and electrical systems are operating properly perform

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BMW 5-Series (E39) Repair Manual 525i, 528i, 530i, 540i, Sedan, Sport Wagon 1997-2002

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Filed Under (BMW) by admin on 07-09-2009

Comprehensive, single source of service information and specifications available specifically for BMW 5 Series from 1997 to 2002. The aim throughout this manual has been simplicity, clarity and completeness, with practical explanations, step-by-step procedures and accurate specifications. Whether you are a professional or a do-it-yourself BMW owner, this manual will help you understand, care for and repair your E39 5 Series. Though the do-it-yourself BMW owner will find this manual indispensable as a source of detailed maintenance and repair information, the BMW owner who has no intention of working on his or her car will find that reading and owning this manual will make it possible to discuss repairs more intelligently with a professional technician.
Engines covered in this BMW repair manual:
* 6-cylinder engines: M52, M52 TU, M54
* V-8 engines: M62, M62 TU
Fuel injection systems covered in this BMW repair manual:
* Bosch M 5.2, M 5.2.1, ME 7.2
* Siemens MS 41.0, MS 42.0, MS 43.0
Manual transmissions covered in this BMW repair manual:
* Getrag S5D 250G, S6S 420G
* ZF S5D 320Z
Automatic transmissions covered in this BMW repair manual:
* A4S 270R, A4S 310R
* A5S 360R, A5S 390R
* A5S 325Z
*A5S 560Z, A5S 440Z

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BMW 5-Series (E28) Repair Manual 528e, 533i, 535i, 535is 1982-1988

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Filed Under (BMW) by admin on 07-09-2009

BMW 5-Series (E28) cars from 1982-1988. Whether you’re a professional technician or a do-it-yourself BMW owner, this manual will help you understand, maintain, and repair systems on 5-Series cars.
BMW E28 Models and engines covered in this BMW repair manual:
* 528e
(B27, 2.7 liter)
* 533i
(B32, 3.2 liter)
* 535i
(B34, 3.5 liter)
*535is
(B34, 3.5 liter)
BMW E28 Transmissions covered in this BMW repair manual:
* Getrag 260
(with integral bellhousing)
*Getrag 265
(with removable bellhousing)

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2000 BMW 323I Sport Wagon Check engine light is illuminated in dash

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Filed Under (BMW) by admin on 14-06-2010

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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

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