Any ideas ... Misfire Cyl 1 and 3

[clueless1]

any suggestions for where to get the CU plugs (bosch, beru, whatever) in town?

(I've read varying things about platinum/iridium in 986, and reccs to stay with OE copper. But I've also read about folks going platinum. Never read about experience with iridium??? Couldn't make a lot of sense out of it, mainly I was wondering about susceptibility to edmonton weather conditions?)

As for fuel, I was definitely wondering about this ... I am using mohawk 94 octane (which has 10% ethanol ... which could throw o2 sensors off I'm guessing), but am going to try out shell V power today.

Problem is definitely progressing/ getting worse.

Originally Posted by chris97boxster

Another edmonton boxster owner
depending which plugs u prefer
canadian tire carries bosch platinum and ngk platinum/iridium
$60 later & 1 hour I was done

Do one plug @ a time
make sure they snap in
check condition of wires
Clear codes and start again

C if O2 sensor codes come up again
if not...great
if they do. ....deal with it then
what fuel r u using?
fresh?
when was fuel filter last changed?
Somethings to ask yourself
Chris

[chris97boxster]

I'm staying away from mohawk/husky 94
ethanol has its cons
when I was in montana
a lot of places were advertising premium without ethanol

I only fill up @ shell now
odd time @ esso

I'm running iridium no issues with plugs
going back to CU copper core would b a step backwards IMO

I ran a tank of 94 from husky & it t threw O2 codes
that's when I changed plugs

I like jake d 's idea if u have coil/wire problem
but I would do plugs 1st

Chris

[Steve Tinker]

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....