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Spark Plugs

Author : Joseph Phan Posted on : 03/12/2004
Model : BMW, 5 - Series (E34) 1989-96 Category : Electrical - Ignition
Source : http://www.bmwe34.net
 


A spark plug is an important part of the ignition system as it produces the spark that ignites the petrol/air mixture in the engine's cylinder. The spark plug can have a dramatic effect on the performance of the engine, it must therefore be checked on a regular basis to maintain the performance of the engine. Below are some hints on the correct replacement procedure for spark plugs.



Procedure
  • Spark plug socket or spark plug tool
  • Rachet, extensions and u-joints if needed
  • New spark plugs

    1- Identify which spark plug lead fits which cylinder. A suggestion is to attach numbered tags to the respective leads if no other identification is available.
    2- Pull the connectors off the plugs. Do not pull on the cable.
    3- Ensure that the spark plug tool is securely fitted before trying to remove the plug.
    4- Check the gap on the new plugs, see below.
    5- Fit the new plugs with a little piece of plastic tube and tighten to finger tight.
    6- Using a spark plug tool, tighten the plugs between ½ and ¾ of a turn from finger tight. Refer to the owner's manual for torque specifications.
    7- Fit the plug connectors in the correct firing sequence and ensure they are securely attached to the plugs.
    8- Start the engine. If it does not run smoothly, repeat step 1 to 7 and check that the plugs have not been damaged during tightening. Check ignition leads and replace if necessary, also check for cracked insulators, air gap etc.


    Bosch platinum +4


    Can you install Bosh platinum +4 in your car? Hummmm, I don't know, basically everyone has a different opinion if this is good or bad for the engine, and if this gives more power or a smoother idle...

    If you feel like wasting some money (these are not cheap), you can try them... and send me an e-mail if it is working.



    Part numbers
    525i (89-90) M20 - 535i
    Regular Bosch W8LCR Gap: 0.7-0.8 mm (0.028-0.032 in)
    (On the 535i, set them slightly larger to 0.86-0.91mm (0.034-0.036in to help improve the idle.)
    Platinum Bosh W8LPR (alternate choice)


    525i (91 on) M50 - 530i - 540i
    Bosch F7 LDCR Non adjustable

    Thanks to Joseph Phan
    •  

    Pictures

    Picture 1
    Picture 2

    Click on the thumbnails to see larger images.

     

    References

  • http://www.bmwe34.net
    •  


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