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

dcporsche99 · 02-19-2008, 12:28 PM

+1 on not driving it and getting it towed to your trusted Porsche mechanic.

Good luck and keep us posted!

fatmike · 02-19-2008, 01:18 PM

Was your CEL still flashing when you drove it to the mechanic? Or did it FLASH then turn solid after the "event"?

Get the car checked out & let us know what they find.

KevinH1990 · 02-19-2008, 01:50 PM

Sounds like the same symptoms I had when my Mass Air Flow (MAF) Sensor failed. You might want to search on that topic for more info.

You were wise to stop driving the car. The technician who repaired my car stated that raw fuel could flow into the catalytic convertors which is a serious fire hazard.

If it is your MAF, it is about a $500 repair. Not cheap, but less than a new engine.

Good luck.

JPW · 02-19-2008, 01:58 PM

I just had to do a MAF last week. Save yourself some research here was the cheapest I could find.

http://www.thepartsbin.com/catalog/?N=1698+11567+4294967265+9359

I got it for $250.00

Good luck and hope it turns out to be nothing worse that this.

martmart · 02-20-2008, 07:52 AM

I went with the advise and purchased a code reader: http://talktomycar.co.uk/Shop/Code_Readers/mj004.htm

It has identified 4 faults and the manual describes them as:

P0300 Random/multipul cylinder misfire
P0301 Cylinder 1 misfire
P0302 Cylinder 2 misfire
P0303 Cylinder 3 misfire

So its given a good direction to the problem but I don't know which cylinder's are 1,2 & 3 as I sit in the drivers seat? Also, I'm not really sure what to check other than the wires for the spark plugs? Any other ideas? Thanks.

Tool Pants · 02-20-2008, 09:38 AM

Cylinders 1-3 are bank 1 which is on the right side of the car. If you have a RHD then it is the drivers side.

Check to make sure that the connector to each coil is connected properly. You also might remove the coils and check for cracks.

Topless · 02-20-2008, 09:45 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, 12:35 PM

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!