Coil Club: I'm in and then some...
07-15-2008, 02:33 PM
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Coil Club: I'm in and then some...
'06 Pepper S, **** Ed
16K miles and eight cracked ignition coils.
The symptoms were rough idle and engine shudder at low rpm (<2K). All eight coils were cracked in the exact position depicted in SCOTITUDE's pic in the coil TSB thread.
Interestingly, after replacing all the coils, the engine would not start. A blown fuse #5 was also thrown into the mix and the dealer computer would not communicate with the engine control module (ECM).
The tech finally tracked down a short related to an air temp sensor on the driver's side of the engine bay. This short reportedly caused the communication error with the ECM. I'm not clear on this relationship since I don't have any wiring diagrams and I'm not quite sure which #5 fuse was actually blown.
Fuse #5 on the left dashboard is listed as "Sockets in luggage compartment".
Fuse #5 on the right dashboard is listed as "Towing attachment".
Anyhow, Porsche instructed the dealer to replace the entire ECM. I just got the Pig back, and she's running smoother than ever. No rough idle and no engine shudder. The spark plugs were not changed.
Here are the parts I received:
955-618-602-00 (DME CONTROL UNIT)
955-618-550-02 (TEMP SENSOR. AIR INL)
955-612-912-00 (HARNESS)
948-602-104-05 (PENCIL COIL)
16K miles and eight cracked ignition coils.
The symptoms were rough idle and engine shudder at low rpm (<2K). All eight coils were cracked in the exact position depicted in SCOTITUDE's pic in the coil TSB thread.
Interestingly, after replacing all the coils, the engine would not start. A blown fuse #5 was also thrown into the mix and the dealer computer would not communicate with the engine control module (ECM).
The tech finally tracked down a short related to an air temp sensor on the driver's side of the engine bay. This short reportedly caused the communication error with the ECM. I'm not clear on this relationship since I don't have any wiring diagrams and I'm not quite sure which #5 fuse was actually blown.
Fuse #5 on the left dashboard is listed as "Sockets in luggage compartment".
Fuse #5 on the right dashboard is listed as "Towing attachment".
Anyhow, Porsche instructed the dealer to replace the entire ECM. I just got the Pig back, and she's running smoother than ever. No rough idle and no engine shudder. The spark plugs were not changed.
Here are the parts I received:
955-618-602-00 (DME CONTROL UNIT)
955-618-550-02 (TEMP SENSOR. AIR INL)
955-612-912-00 (HARNESS)
948-602-104-05 (PENCIL COIL)
07-15-2008, 04:39 PM
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I called the service dept. and inquired about fuse #5. It looks like they meant to type FUSE #51 on the invoice. Now it makes sense.
Fuse #51 left dashboard: Diagnosis, parking brake switch, Air conditioning
The short in the ambient air temp sensor blew the fuse in the diagnostics circuit which explains why the service computer couldn't communicate with the ECM.
Fuse #51 left dashboard: Diagnosis, parking brake switch, Air conditioning
The short in the ambient air temp sensor blew the fuse in the diagnostics circuit which explains why the service computer couldn't communicate with the ECM.
07-15-2008, 05:57 PM
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I really don't get it, Porsche and Coils. I have had two Porsches and both have required the premature replacement of the coils. The 996 was in for 1 full set and spark plugs while the CTT is already on its third set (I have a sneaking suspicion that it will be going for round 4 on the next visit). Where does Porsche buy its coils! I have yet to pay for a set, so it’s no skin off my back, except for the time lost, but what is up?
