2004 996 3.6 engine intermittent dies at speed

[Matz73z]

I’m trying to diagnose an intermittent loss of throttle while driving.  It happened for the first time today and continued to happen intermittently for over an hour.  It started after driving 3+hrs, in the Sierras near Yosemite (between 7000-8500 ft) with outside temperatures in the mid 80’s and the car running flawlessly at around 210F.  While on throttle (light or heavy) the engine would just quit.  If I put the clutch in it would stop completely.  After 2-10seconds the engine would kick back on at whatever throttle level was set, as if nothing was wrong, and continue on for between 30sec to several minutes.

 

The issue finally seem to stop after we coasted down a grade for about 5 miles (engine braking the whole way).

 

The issue would happen in any gear, at any speed and even if the clutch was depressed.  It died at a stop once also, but started right up with the key.  No codes were thrown for the OBD2 system and no warning lights flickered or came on.

 

This is a base 996 C2 with no PSM.

 

 

[JFP in PA]

13 hours ago, Matz73z said:

I’m trying to diagnose an intermittent loss of throttle while driving.  It happened for the first time today and continued to happen intermittently for over an hour.  It started after driving 3+hrs, in the Sierras near Yosemite (between 7000-8500 ft) with outside temperatures in the mid 80’s and the car running flawlessly at around 210F.  While on throttle (light or heavy) the engine would just quit.  If I put the clutch in it would stop completely.  After 2-10seconds the engine would kick back on at whatever throttle level was set, as if nothing was wrong, and continue on for between 30sec to several minutes.

 

The issue finally seem to stop after we coasted down a grade for about 5 miles (engine braking the whole way).

 

The issue would happen in any gear, at any speed and even if the clutch was depressed.  It died at a stop once also, but started right up with the key.  No codes were thrown for the OBD2 system and no warning lights flickered or came on.

 

This is a base 996 C2 with no PSM.

 

 

 

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