Question about 2003 BMW 330

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Obd ii mismire cylinder 1 - 2003 BMW 330

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Swap plug and coil to cyl#2 and see if fault moves. Also check your throttle boot for split at the thumb going to the idle air valve.

Posted on Feb 25, 2010

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You may have to replace the cowl pack over that spark plug give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car wish you the best of luck Michigan Man.

Posted on Feb 08, 2010

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2 Answers

Engine Misfire


Here's a link to your code problem,P0300 is their's a misfire and every number after 300,like 301 means cylinder one,which this is for both of your codes,go down the list and see if it's your problem.These codes have many faults,have to trouble shoot to fix. P0301 OBD II Trouble Code Here's the P0303 code. P0303 OBD II Trouble Code

Jun 22, 2015 | Saturn Cars & Trucks

1 Answer

I have a cylinder misfiring (according to the CODE) - what do i need to do to repair this?


A misfire that occurs in a given cylinder will set a P030X code where "X" will be the number of the cylinder that is misfiring. For example, a P0302 code would tell you cylinder number two is misfiring.

The misfire might be due to:
1. a fouled spark plug,
2. a bad plug wire,
3. a defective ignition coil in a DIS system,
4. a clogged or dead fuel injector or,
5. a loss of compression due to a leaky exhaust valve, leaky head gasket or worn cam lobe.

On some vehicles, the OBD II system itself will disable a cylinder if it detects a high enough rate of misfire. This is done to protect the catalytic converter. By shutting off the cylinder's fuel injector, the OBD II system prevents unburned fuel from passing through the cylinder and entering the exhaust. Raw fuel in the exhaust is bad news because it makes the converter overheat, and if it gets too hot it can suffer damage. What else does OBD II add to the equation? It also monitors the operation of the catalytic converter with a second oxygen sensor on the tailpipe side of the converter. By comparing upstream and downstream O2 sensor readings, it can determine how well the converter is doing its job. If converter efficiency drops below a certain threshold, the OBD II system will set a code and turn on the Check Engine light.

OBD II can also detect fuel vapor leaks (evaporative emissions) in the charcoal canister, evap plumbing or fuel tank by pressurizing or pulling a vacuum on the fuel system. It can even detect a loose or missing gas cap. In addition, OBD II can also generate codes for various electronic transmission problems and even air condition failures such as a compressor failure.

Hope help with this.

Mar 12, 2010 | 2003 Volkswagen Beetle TDI

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1993 E-150 - OBD I or OBD II


OBD II started with the 1996 model year.

Jan 27, 2009 | 1993 Ford Econoline

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I am workiing on a 1999 toyota carolla has a misfire


Here is a good site for OBD II trouble codes.  P0300: Random/Multiple Cylinder Misfires Detected, P0301: Cylinder 1 Misfire Detected, P0304: Cylinder 4 Misfire Detected.

Jan 25, 2009 | 1999 Toyota Camry

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