Ditch these plugs and pick up some NGK's gapped to .028 and your misfires should go away. If the misfires are still present, start looking over your coil harness with a fine tooth comb and look for any cracks.
Pros: misfires should go away
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Usually the rule of thumb i've seen is the more expensive plug you use in your vrt, the ****tier its gonna run. NGK BKR7E's gapped to .022 and mine runs grand.
Pros: runs grand
Cons: expensive plug runs ****tier
Part number: BKR7E
Sounds like it could be a spark plug. For some reason the Prelude likes to eat through them. Shows the exact same symptoms you describe (loss of power, different exhaust note).
Pros: loss of power, different exhaust
Vehicle:
Honda Prelude
Last night I finally decided to trash the bosch spark plugs and installed some new NGK spark plugs and while I had my upper intake manifold off I bought a couple cans of throttle body cleaner and gave my upper intake manifold out and also gave my throttle body a real good clean. It was covered in sludge. But anyways after I sea foamed it a couple weeks ago, changed the oil and filter, spark plugs and cleaned the throttle body last night my car is running like a champ and doesn't feel boggy anymore.
Pros: car running like a champ
Cons: covered in sludge
Vehicle:
Volkswagen Golf
im driving a mk4 1.8t just had unitronic 1+ tune done last saturday car is still running good and havent even gotten colder sparks in yet. i bought ngk bkr7e plugs, one step colder.
Pros: car is still running good
Part number: BKR7E
I can't tell you how many times I get techs at my counter showing me fouled aftermarket plugs from these cars. Nothing works better than the OE plug with these cars. We have a 993 TT with a pair of K24's on it that will destroy anything but a factory plug. Just put in the OE plug and ignore anything else when it comes to your Boxster.
Pros: OE plug works best
Cons: aftermarket plugs foul
Vehicle:
Porsche
As for your plugs, bosch is deff the recommended brand, but just about any high quality plug designed for your engine will work fine. (im currently running platinum in mine, and their fine, but lots of people have reported idel issues with them.) The motor was designed around a copper plug, so thats what it should run on best. so bosch copper is deff the way to go.
Pros: high quality, work fine
Cons: idel issues reported
Vehicle:
Volkswagen Jetta
Autolites last as long for me as the NGK's. Either of them last about 10k miles for me. Any longer than that and I start getting missfires. The Autolites can be found for about $1.00 each
Pros: last 10k miles, cheap
Cons: misfires after 10k miles
Mileage: 10000 km
The NGK's listed have a colder heat range. Great in the summer, it will misfire like crazy in the winter
Pros: great in summer
Cons: misfire in winter
Vehicle:
Volkswagen Passat
this summer I switched from oem to platinum bosch plugs and just recently took to dealer and had plugs changed as they said the platinum plugs in fsi engine will cause some fuel to not burn properly.
Cons: fuel to not burn properly
Vehicle:
Volkswagen Passat B6
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