997.1TT - P0021 Camshaft Over-Advanced - No Luck with Actuator Replacement
12-14-2018, 03:57 PM
#31
You can view actual camshaft angle for sure with the Cobb. There are 4 or them (2 intakes, 2 exhaust). You can run them on datazap and see them running in tandem and close to each other.
Also can you confirm the part number you replaced. The sensor is not $50 so I just want to make sure you changed out the right item.997-105-303-73
Also can you confirm the part number you replaced. The sensor is not $50 so I just want to make sure you changed out the right item.997-105-303-73
12-26-2018, 04:22 PM
#32
Update:
I've driven the car a few times now and the hesitation is gone and the CEL has not returned. I'm wondering if the actuator was bad and the ECU just had to relearn the control parameters after I installed the new one. If the old actuator was fine, replacing it would have had no effect, however I noticed a hesitation at 2500 rpm and light throttle immediately after installation of the new part. Perhaps the Porsche manual suggests an ECU reset after changing this part, which I did not perform.
We'll see!
I've driven the car a few times now and the hesitation is gone and the CEL has not returned. I'm wondering if the actuator was bad and the ECU just had to relearn the control parameters after I installed the new one. If the old actuator was fine, replacing it would have had no effect, however I noticed a hesitation at 2500 rpm and light throttle immediately after installation of the new part. Perhaps the Porsche manual suggests an ECU reset after changing this part, which I did not perform.
We'll see!
12-27-2018, 10:10 AM
#33
Update:
I've driven the car a few times now and the hesitation is gone and the CEL has not returned. I'm wondering if the actuator was bad and the ECU just had to relearn the control parameters after I installed the new one. If the old actuator was fine, replacing it would have had no effect, however I noticed a hesitation at 2500 rpm and light throttle immediately after installation of the new part. Perhaps the Porsche manual suggests an ECU reset after changing this part, which I did not perform.
We'll see!
I've driven the car a few times now and the hesitation is gone and the CEL has not returned. I'm wondering if the actuator was bad and the ECU just had to relearn the control parameters after I installed the new one. If the old actuator was fine, replacing it would have had no effect, however I noticed a hesitation at 2500 rpm and light throttle immediately after installation of the new part. Perhaps the Porsche manual suggests an ECU reset after changing this part, which I did not perform.
We'll see!
Clearing out the check engine light should have reset all the ecu learning, but also could of been a blockage that cleared.
12-27-2018, 03:34 PM
#34
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I don't think clearing a CEL resets any adaptations/learnings in the ECU? Could be wrong, but that wouldn't make sense.
12-27-2018, 03:49 PM
#36
12-27-2018, 04:14 PM
#37
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If you want a hard reset flash your ECU back to stock or load any tuned file...
Clearing CEL's is a soft reset.
Wish all good Karma to the OP with regards to his variocam intake module CEL.
Clearing CEL's is a soft reset.
Wish all good Karma to the OP with regards to his variocam intake module CEL.
12-27-2018, 04:15 PM
#38
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Ahh right. Wasn't thinking about COBB, but Durametric. Does sound annoying, glad I don't use one!
12-27-2018, 04:38 PM
#40
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You lose stored adaptation values. ECU has to re-learn them. Many will relearn within 30 seconds.. Emission Drive cycle will take longer.
01-21-2019, 01:20 PM
#41
Hope the car is running well now!
Also, unplugging the battery for 2+ days, doesn’t that reset capacitors, but not the ECU parameters? What’s the best/true proper way to start completely fresh on these cars?
Also, unplugging the battery for 2+ days, doesn’t that reset capacitors, but not the ECU parameters? What’s the best/true proper way to start completely fresh on these cars?