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Old 04-03-2009, 09:47 AM   #1
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Stumbling/misfiring/check engine light!!!

My 2001 Boxster was stored for the winter and before I took it out of storage I put in a set of original type Beru spark plugs. The job went OK except that reconnecting the wiring harness to the coils was somewhat troublesome on several cylinders. This was the first plug change at 36K.

I drove the car over 3 days and it ran as good, or better, than ever. All mild driving. All of a sudden the engine started to shudder and the check engine light came on. After a quick roadside exam I was fairly convinced that I had a misfire condition as a result of one of the coil wiring connections slipping off. My logic says that this has something to do with my spark plug change. No damp or rainy weather involved.

The car will run at an idle but somewhat unsteady. It definitely stumbled and shuttered when accelerating but would cruise at 3000 rpm fairly well so I drove it the 3-4 miles home. No smoke of any kind. Once home I got under there and rechecked the wiring boots on the coilsÖÖ.to my disappointment they were solidly in place.

Now Iím worried. I donít have a OBD11 meter. I donít know if an ordinary meter would tell me which cylinder was misfiring, so perhaps I need an expensive Porsche specific one to tell me that.

I can pull all of the coils and spark plugs and look for a problem, but unless the problem is visual, I donít know how to diagnose it.

Any advice would be appreciated.


Ps OhÖ.and get this. While it was in storage, I bought a 3 yr extended warrantee WHICH HAS A 1000 MILE WAITING PERIOD. What I dope I was to be honest with them about the miles!!!

2001 Boxster, GT3 console delete, lower stress bar, RoW M030 suspension package, painted bumperettes.
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Old 04-03-2009, 09:57 AM   #2
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If you are sure the plugs and connections are good, you could try Autozone and have them check for codes.
http://i240.photobucket.com/albums/f...r/carlit-1.jpg 2003 Boxster S
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Old 04-08-2009, 03:03 PM   #3
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WooHoo! Fixed.....!

Borrowed an OBDII meter and it said misfire on #4. Sure enough, even though I checked each wire-coil connection before, it actually was loose. # 4 is the hardest plug to reach due to location and obstructions. It took me a half hour to get that thing to click into place, but it's done and I'm now enjoying a La Fin Du Monde ale (our Canadian readers will know about that....9% alc.) in celebration.

2001 Boxster, GT3 console delete, lower stress bar, RoW M030 suspension package, painted bumperettes.

Last edited by Bobiam; 04-08-2009 at 03:10 PM.
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Old 04-08-2009, 04:07 PM   #4
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Glad you found it, but I would have had some distilled beer after such a fix.

1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S. 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...
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Old 04-08-2009, 06:48 PM   #5
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Ditto... glad you found it...

I prefer distilled wine though...

1990 Porsche 964 Carrera 4 Cabriolet
1976 BMW 2002
1990 BMW 325is
1999 Porsche Boxster
(gone, but not forgotten)

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