Misfire & engine light - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Topless · 02-20-2008, 08:45 AM

Only misfire codes? No sensor codes? Problem is in bank one. I suspect something is still missing. Usually you will also get a too rich/ too lean code that identifies the problem. Do a code search on Renntech.org for further details and things to look for. Any recent service/modifications done? Recently blast through standing water that may have soaked your coils?

martmart · 02-20-2008, 11:35 AM

I've taken the coils off 1,2 & 3 cylinders on the right side of the car (as you sit in it). I found nothing wrong at all. The clips holding the wires in place are all fine and there is no oil in the spark plug tubes?

I drove it down the road but still same problem - holding back a lot and very lumpy. The Engine light is still flashing but does go constant when not at idle.

Only other think I did notice was that there is a bit of oil on the sump. Not really enough to even make a mark on the ground but its very difficult to see where it could of come from.

I'm now starting to get very worried!

Lil bastard · 02-20-2008, 11:51 AM

I vote MAF

racer_d · 02-20-2008, 12:05 PM

Pardon the ignorance, but wouldn't a MAF error cause missfires to BOTH cylinder banks?

Methinks you need to get a Porsche Scan tool to download ALL codes. It was suggested to me that some of the "over the counter" scanners are not always adept at extracting Porsches' information.

Case in point was a local "european" shop code reader could only tell them that "something was wrong".. The independant Porsche shop with the Porsche tools and know how was able to pinpoint the exact part failure and correct the problem.

martmart · 02-21-2008, 06:43 AM

Well, I took it to an independent dealer today and their computer provided more detail than my generic code reader. It did state that the cam position sensor was incorrect. So they are replacing it - about £100 for the part & up to another £300 for time. They seem very good and I hope it works!

insite · 02-21-2008, 10:12 AM

you can get a flashing CEL because you left the gas cap or oil fill cap off (or not properly sealing). there's even a sticker behind the gas fill flap that says this.

racer_d · 02-21-2008, 11:11 AM

Quote:

Originally Posted by martmart

Well, I took it to an independent dealer today and their computer provided more detail than my generic code reader. It did state that the cam position sensor was incorrect. So they are replacing it - about £100 for the part & up to another £300 for time. They seem very good and I hope it works!

Glad to hear a diagnosis was made. Ideally the correct one. That PST2 or whatever Porsche calls it is much better than the generic ones. The same shop that solved my issue (a failed variocam actuator) has had several clients who have replaced MAFs thinking that was the problem (due to the generic code reader) only to learn it was other things wrong with the cars.

JP-s-in st. louis · 02-21-2008, 09:37 PM

I bet you are also getting a code of P013something.. This wil say that you have a bad O2 sensor on the 1-3 cylinders (passengers side). I know, I had all the same codes till about 2 hrs ago.