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Dharn55

Camshaft Timing/durametric Reading/errors

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Thanks, for the feedback. Weird it doesn't throw the check engine light. The threshold must be larger on these early cars

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So should the 986 be at 25 degrees when the car is running and -+6' when not running I just got my durametric and my 00 boxster is 12.25 on bank 1 and -6.69 on bank 2 what should I do to correct this anything and all thank you so very much

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So should the 986 be at 25 degrees when the car is running and -+6' when not running I just got my durametric and my 00 boxster is 12.25 on bank 1 and -6.69 on bank 2 what should I do to correct this anything and all thank you so very much

 

Answered elsewhere; you need new wear pads.

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On ‎4‎/‎29‎/‎2010 at 1:28 PM, tholyoak said:

Camshaft position 1 deviation -12.15

Camshaft position 2 deviation -02.45

These are adaptation values. The range for these values should be +/- 6 degrees. The thing to keep in mind this is 6 degrees at the crank, so 3 degrees at the cam. So your bank 1 cam is out by ~6 degrees.

Actual angle for camshaft bank 1 .1 (at idle) 25.94 (at 2,000 RPM)

Actual angle for camshaft bank 2 .3 (at idle) 24.74 (at 2,000 RPM)

This is what the motor thinks the actual cam angle is based upon the tab on the cam passing the Hall sensor on the head and the adaptation values.

These actual angles should be ~0 with variocam off and ~25 with variocam on. From these values you know that the variocam actuators are fine (as long as you get close to 0 with them off). You have an issue with the relationship of the tab on the cam with the hall sender. Either the cams are missed timed slightly or the tab on the cam is bent/damaged.

-Todd

Sorry to be bringing up an old thread but just looking for some clarification on this one and trying to understand the nomenclature.

Seeing that the deviation of bank one is off by 12 degrees Crk , but the actual angle  read at idle is 1.1 degrees. Would it be fair to say the engine is working "full on " to adapt this car to try and maintain the 1.1 at idle and 25.94 at 2K ?

 

just helping a friend with P1397 problem so got me interested in the whole theory of operation. The car we are working on is a 99 996 so has DME 5.2.2 . we can see deviation but 5.2.2 does not show actual  ( unless I just cant see it ) which is a bit disappointing. I wanted to see if it jumps to 25 when actuating variocam but without seeing actual we wont know. 

 

Thanks

 

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On 11/6/2018 at 9:31 AM, theiceman said:

Sorry to be bringing up an old thread but just looking for some clarification on this one and trying to understand the nomenclature.

Seeing that the deviation of bank one is off by 12 degrees Crk , but the actual angle  read at idle is 1.1 degrees. Would it be fair to say the engine is working "full on " to adapt this car to try and maintain the 1.1 at idle and 25.94 at 2K ?

 

just helping a friend with P1397 problem so got me interested in the whole theory of operation. The car we are working on is a 99 996 so has DME 5.2.2 . we can see deviation but 5.2.2 does not show actual  ( unless I just cant see it ) which is a bit disappointing. I wanted to see if it jumps to 25 when actuating variocam but without seeing actual we wont know. 

 

Thanks

 

Got this resolved ..

After much analyzing and discussion we decided to pull the cover... we removed the muffler, muffler bracket and cover .. sure enough we were off by one link between cams. loosened the tensioner right off and were able to move it one tooth. 

all resolved. 

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