Variocam Issue?

[traveno]

Originally Posted by JFP in PA

And, if anyone is interested, somebody in the aftermarket (Rauch and Spiegel) now makes the tubes in aluminum, totally eliminating the tendency for the OEM plastic tubes to deform and/or crack over time.............

Those looks beautiful. I just replaced mine with new plastic tubes. Otherwise I could try to justify buying a set of these. Maybe I’ll find a set in my stocking this Christmas. I hope!

[freserf]

Thanks for the replies ... I like the boat plug method, unfortunately I sold my boat about 10 years ago. I tried several different make shift tools ... the head of a carriage bolt and a set of measuring calipers slightly modified. The tubes did not want to let go so I ended up removing the outer plastic to remove the large o-ring and then they decided to let go ... I hope I did not get any pieces into the head as they were very brittle.

The Rauch and Spiegel aluminum tubes look like a great idea ... I will probably get these if I do need to remove the head covers to replace solenoid or timing chain pads. I noticed that they also sell the puller tool ... tempting, but I'll hold off unless I decide to work on future Porsche Projects.

I plan to drop the car off the jack stands this evening or tomorrow and test the engine for repeat codes.

[freserf]

Well ... pulled the car out of the garage for testing. Fired up engine with new air filter, fresh fuel, oil, and spark plugs. The engine codes reappeared. Misfire on bank1 with camshaft position code P0341. I did notice that the engine ran fine until the secondary air blower timed out. If I let the codes set at idle ... which is rough, I could clear them and then slowly raise the RPM's up to about 2600 when I heard the timing chain rattle. Reset the codes and was able to hold the RPM's steady at about 1850 without any misfires.

So, I would like some input on what to try next. Idle at engine full temperature is rough due to the misfire detections ... but at cold startup idle is good until secondary air timeout. Able to hold RPM's up with no misfires.

What do you guys think?

[blue62]

Originally Posted by freserf

Well ... pulled the car out of the garage for testing. Fired up engine with new air filter, fresh fuel, oil, and spark plugs. The engine codes reappeared. Misfire on bank1 with camshaft position code P0341. I did notice that the engine ran fine until the secondary air blower timed out. If I let the codes set at idle ... which is rough, I could clear them and then slowly raise the RPM's up to about 2600 when I heard the timing chain rattle. Reset the codes and was able to hold the RPM's steady at about 1850 without any misfires.

So, I would like some input on what to try next. Idle at engine full temperature is rough due to the misfire detections ... but at cold startup idle is good until secondary air timeout. Able to hold RPM's up with no misfires.

What do you guys think?

P0341 is as you know cam position sensor1: signal implausible/implausible operating range/malfunction.
You stated that you tested it.
Did you test to see if signal is getting back to the DME over the entire operating range?
If everything tests good with the Cam position sensor and wiring then I would look at Camshaft deviation and Camshaft timing on bank one.

[freserf]

What tool ... that is reasonable would be best to look at the signals? I only have MBII iCarsoft tool that I use with my Benz. I am able to read live data, but not much ... o2 sensors, TPS, fuel demand, rpm ... it also has o2 sensor tests that seem to be good. I guess I will find the computer (DME) and check connections and double check for bad or rubbed wires.

[blue62]

Originally Posted by freserf

What tool ... that is reasonable would be best to look at the signals? I only have MBII iCarsoft tool that I use with my Benz. I am able to read live data, but not much ... o2 sensors, TPS, fuel demand, rpm ... it also has o2 sensor tests that seem to be good. I guess I will find the computer (DME) and check connections and double check for bad or rubbed wires.

If you could get something like the Durametric or a Foxwell that reads cam deviation or cam angle. one of those would work.
I have both. on either scanner I can look at Camshaft deviation on each bank.

I can also look at actual cam angle while the car is running so I can compare one bank to the other to see if they are close to each other or are the numbers way different from one bank to the other.
That is what I would want to look at in your case with the sensor testing good.

If your tool is able to test the cam position sensor and it tests good then it is probably ok. I believe the scanner is reading what the DME sees.

[freserf]

Which Foxwell reader?