cparke

I have two very weird things going on with my readings in this block (camshaft position & adjustment).

First, while my normal positions are 0 on both banks, they do intermittently jump to -3 or +3 and then fall back to 0. While those values are still within spec., that is really weird, isn't it? What could I have checked to figure that one out?

Second, camshaft adjustment is never activated, even when driving in 2nd gear at 4000+ RPM. It just never changes to ON. While the car seems to be running fine, that doesn't seem right, does it? What could I have checked to figure that one out?

As always, thanks for your thoughts...

cparke

Here is a WOT to the redline test of my 6-cyl. car with measuring blocks open on the camshaft positions and misfire counting on bank 1 (bank 2 can be implied to have had no misfires). The test resulted in a flashing CEL and 5 fault codes thrown.

Measuring blocks
Group A: '090 (Camshaft adjustment)
Group B: '014 (Total misfire counter)
Group C: '015 (Bank 1 misfire counters)

TIME STAMP|Engine RPM|Adj ON/OFF|Adj resp Bank1|Adj resp Bank2|TIME STAMP B|Engine RPM|Engine Load|Total misfires|TIME STAMP C|Misfires Cyl 1|Misfires Cyl 2|Misfires Cyl 3
56.39| 680|Cam Ctrl. OFF| 00|-1|56.67|680 |2.00|0 |56.11|0 |0 |0
57.22| 680|Cam Ctrl. OFF| 00|-1|57.49|680 |1.95|0 |56.95|0 |0 |0
58.03| 680|Cam Ctrl. OFF| 00| 2|58.31|680 |2.00|0 |57.77|0 |0 |0
58.87| 680|Cam Ctrl. OFF| 00| 2|59.14|1320|5.25|0 |58.59|0 |0 |0
59.69|1880|Cam Ctrl. ON |-12|14|59.97|1960|5.15|0 |59.42|0 |0 |0
60.52|2320|Cam Ctrl. ON |-21|23|60.79|2560|5.85|15|60.24|0 |0 |0
61.34|3160|Cam Ctrl. ON |-21|20|61.62|3520|6.45|78|61.07|12|12|12
62.17|4120|Cam Ctrl. ON |-21|23|62.46|4440|6.30|85|61.89|28|27|30
63.10|5080|Cam Ctrl. ON |-21|23|63.48|5440|6.60|85|62.76|28|27|30
64.14|5480|Cam Ctrl. OFF| 00| 2|64.46|5240|0.75|85|63.81|28|27|30
65.03|4840|Cam Ctrl. OFF| 00|-1|65.30|4640|0.80|85|64.77|28|27|30
65.85|4280|Cam Ctrl. OFF| 00|-1|66.18|4080|0.80|85|65.57|28|27|30


Address 01: Engine
Control Module Part Number: 4D0 907 551 AH
Component and/or Version: 2.8L V6/5V MOTR AT D01
Software Coding: 06251
Work Shop Code: WSC 06335
5 Faults Found:

17746 - Camshaft Position Sensor (G40): Open or Short to Plus
P1338 - 35-10 - - - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16685 - Cylinder 1: Misfire Detected
P0301 - 35-00 - -
16687 - Cylinder 3: Misfire Detected
P0303 - 35-00 - -
16686 - Cylinder 2: Misfire Detected
P0302 - 35-00 - -

Readiness: 0000 0000


The spec. for camshaft positions is -3 to +6 in normal mode, and 16 to 25 in shifted mode (adjustment active). On Bank 1, I got -12 and -21 when adjustment was active (completely off spec.), which obviously totally baffled the computer and caused it to fault the camshaft position sensor itself! (though I never understood why the G40 camshaft position sensor 1 is mounted onto the back of bank 2) On Bank 2, the only questionable thing about the results is the initial position at 14degrees, which is too low (<16) for when camshaft adjustment is active.

What do you folks make of this? Did bank 1 just totally lose compression once adjustment was active. How could it have adjusted the wrong direction like this? What possibly could be wrong with my engine's setup?