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spark plugs and ignition coil


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This is a new post regarding some maintenance work I am about embark on. my 98 boxster

Spark Plugs: I got 6 of those NGK BKR-6EK, on the avg, how long do they last under normal driving condition.

Ignition coil: How do I trouble shoot these coils (one per spark plug). besides visual inspection. Can I use multimeter for some resistance testing?

At 116000 miles, while I got the car jacked up and both rear wheels out, should I do additional maintenance based work besides changing the rear brake pads?

Any input is greatly appreciated!

:)

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Thanks!

I noticed that the both right and left cylinder banks, the middle cylinder's spark plug sleeves are coated w/ motor oil.

Wonder why the middle ones failed. Are they subjected to more heat?

I will try to use a brass/rubber boat transom plug to pull that sleeve out the engine. www.pedrosgarage.com/Site_3/Change_Spark_Plugs_%26_Tubes.html

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If you are changing the spark plugs at 116K you might as well go to DIY Menu/Maintenance Schedule at the Top of the page and do the entire 120K major tune-up. Lots of things from oil, filters, serpentine belt, etc. At 90 K I replaced my coolant, some hoses, water pump and the thermostat. I recently replace my front motor mount two weeks ago. I wished I would have done that sooner, what a difference!

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Just an update,

I started w/ changing the Bosch FR7 LDC4 plugs to NGK BKR 6EK, as it turned out, I think the NGK plugs are in heat range 6. The engine started misfire/ ran rough.

So I got Bosch plugs FR7 LDC+ (not FR7 LDC4) in now. The engine seems to run smoothly.

So here is the run down.

Kragen's auto: NGK BKR 6EK @ 5.99/each, misfire. Exchange them for Bosch FR7 LDC+ @ 3.99/each.

No problem.

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European heat range system (like Bosch) is upwards based: Bosch range 7 is heater than 6 and colder than 8. NGK used the opposite system: NGK range 6 is heater than 7 and colder than 5. So do not compare them in the same way.

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