"Check Engine: Bring to workshop" Engine Light On.

[jakeru]

Originally Posted by JFP in PA

If you are getting P0300 series misfire codes, your coils or plugs are most likely the issue. I'd start there. And if this is the case with the codes, the Durametric is not going to tell you any more; you need to start doing close up diagnostics to ID the source.

Thanks for the info, JFP! Last summer I had a freak misfire episode (the CEL was flashing and engine clearly missing when it was happening, but fixed itself after shutting the car off, waiting a couple minutes, and restarting) that ended up being a P0303 - "Cylinder 3 misfire detected", so your advice seems like it should also be applicable in my case.

Looking under the car closely recently, I noticed there was evidence of a very a slight oil leak in middle cylinder on right (passenger) side. I wonder if that's cylinder #3. I have a set of new plugs ready to go, as well as new o-rings for the spark plug tubes. I suppose I should inspect the coils for cracks (especially whichever one is #3).

It's a 2001 boxster base 2.7 with a bit over 100k miles on it.

[911monty]

Originally Posted by jakeru

Thanks for the info, JFP! Last summer I had a freak misfire episode (the CEL was flashing and engine clearly missing when it was happening, but fixed itself after shutting the car off, waiting a couple minutes, and restarting) that ended up being a P0303 - "Cylinder 3 misfire detected", so your advice seems like it should also be applicable in my case.

Looking under the car closely recently, I noticed there was evidence of a very a slight oil leak in middle cylinder on right (passenger) side. I wonder if that's cylinder #3. I have a set of new plugs ready to go, as well as new o-rings for the spark plug tubes. I suppose I should inspect the coils for cracks (especially whichever one is #3).

It's a 2001 boxster base 2.7 with a bit over 100k miles on it.

Hey Jakeru! Porsche cylinders are numbered in order from front (closest to passenger compartment) to back. Bank #1 cylinders on pass side are 1,2 & 3. Bank 2, driver side are 4,5 & 6. so middle cylinder leaking on your car is #2.