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Steve Tinker · 03-18-2011, 05:28 PM

Why would you change the type / spec of the spark plugs from what Porsche recommend - and pay a hefty premium for them to boot?
Running non spec plugs is worse than using the wrong oil - if it goes wrong, you can have serious problems !!

If you have a missfire & you don't know the history, go back to basics and change all 6 plugs to either Beru or Bosch as per Porsche recommendations. While you have the coils unplugged and on the bench, check visually for corrosion and cracking - if in doubt, replace.
If they look OK, swap the suspect coils with good ones from other bank, clear fault codes and start the car - if the fault codes follow the suspect coils then you have your answer....

03-18-2011, 05:28 PM	#11
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	Why would you change the type / spec of the spark plugs from what Porsche recommend - and pay a hefty premium for them to boot? Running non spec plugs is worse than using the wrong oil - if it goes wrong, you can have serious problems !! If you have a missfire & you don't know the history, go back to basics and change all 6 plugs to either Beru or Bosch as per Porsche recommendations. While you have the coils unplugged and on the bench, check visually for corrosion and cracking - if in doubt, replace. If they look OK, swap the suspect coils with good ones from other bank, clear fault codes and start the car - if the fault codes follow the suspect coils then you have your answer.... __________________ 2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley. 2001 MV Agusta F4.