Oh crap. What should I do?

[texomawaves]

One simple thing I forgot to mention... stop by Autozone and get them to read your code with their Actron. Not as detailed as a Durametric, and dont think it can clear codes, BUT you might get an early indication while you're waiting on your $300 Durametric to arrive in the mailbox

[Mike_Yi]

I don't have a CEL so AFAIK, I won't have a code.

I do have an AutoTap, which is supposed to work on all poast-'98 cars. So that should give me diag info. I'll try it this weekend.

[Mike_Yi]

I hooked up the AutoTap today. Even though it doesn't show a whole heck of a lot on this car, it did show me two codes. I'm getting
P1313 - misfire, cylinder 1, emission relevant
P1316 - misfire, cylinder 4, emission relevant.

So at least I know the cylinders involved right now. I still have no CEL, and it seems to be running fine now. Looks like I'm going to have to swap the wires and plugs and see if I get any more problems. I'm a bit worried that I'm not going to find anything since the car is running fine again.

Do you guys think it could have been bad gas? I filled up just before I got to the track. So I probably drove about 30 miles after filling up before the problem. I filled up again when I got home and haven't driven it much, but probably about 30 miles give or take.

[Mike_Yi]

Well, it died today. I've had to drive it to work even though I haven't fixed the problem. It's been running fine though (I've been avoiding high revs). Today, on the way to work, it started running rough at lower revs. When I exited the tollway and pushed in the clutch, the car died. I restarted it and it just ran rough. Something was making a squeaking noise (it sounded like an exhaust shroud squeaking). I turned off the road, shut it off, and coasted to a safe place. Waiting for a tow truck now.

The plugs are 4,000 miles old, the MAF and O2 sensors are about 15k miles old. Not sure what I'll find out.

[Reborn996]

When you changed the plugs did you do coilpacks too? How many miles on your car? If you have 40k or more and are on the original coilpacks I would have them changed. I have had two other Porsche's (996 and Cayenne) with higher miles and in both cases the coilpacks were shot. I do not think they are that much money and should be considered a wear item every 40-60k in my opinion. When they start to go it can be very intermittent and it is just better to replace them every couple of years. IMHO

[eightsandaces]

How old are the O2 sensors? Did you google those codes to see what other people did to resolve them?

[Mike_Yi]

I did not change the coilpacks when I changed the plugs at 60k. It's got 63k now. The O2 sensors are about 15k old, same as MAF.

A set of coilpacks are almost $300! That's not like changing the wipers.