2001 Boxster Camshaft issues

[kbod]

Originally Posted by blue62

For the EVAP system from what I have seen it sounds like the purge vale has an issue.
Watch the video that Gilles mentioned in post 43 he explains what happens in that video.
How does it run at higher RPM????

I watched the video Gilles sent, I learned just how sensitive these engines really are to vacuum leaks. I bought a smoke tester last night and I plan on doing a thorough smoke test right when it comes for any obvious leaks. As its always been, once I hit the gas The rpm kicks right up and it goes pretty good, not that fast admittedly but the car was never a gt3 to begin with. for the evap system there is a fuel tank vent valve (99660520301) and there is a vapor canister purge valve (99660521301) and there is also a vapor canister purge solenoid (99660520101, 99660520100)... i have no idea which one i should start with replacing

[blue62]

Originally Posted by kbod

I watched the video Gilles sent, I learned just how sensitive these engines really are to vacuum leaks. I bought a smoke tester last night and I plan on doing a thorough smoke test right when it comes for any obvious leaks. As its always been, once I hit the gas The rpm kicks right up and it goes pretty good, not that fast admittedly but the car was never a gt3 to begin with. for the evap system there is a fuel tank vent valve (99660520301) and there is a vapor canister purge valve (99660521301) and there is also a vapor canister purge solenoid (99660520101, 99660520100)... i have no idea which one i should start with replacing

should be a way to test all three valves you mentioned. Do a search here on the forum for EVAP system.
Should be lots of info. Evap system problems are a somewhat common issue here on the forum.
I think the tank vent valve is the one mentioned on the video that causes the hard start problem after refill.

[kbod]

Originally Posted by blue62

should be a way to test all three valves you mentioned. Do a search here on the forum for EVAP system.
Should be lots of info. Evap system problems are a somewhat common issue here on the forum.
I think the tank vent valve is the one mentioned on the video that causes the hard start problem after refill.

I had a porsche tech look at the car, what he told me is that the actual values are not indicative of a vacuum leak, rather he believes that the 6+ degree camshaft deviation on bank 2 is what is causing my rough idle, as I replaced the variocam actuator on bank 1 but I did not touch bank 2, leading to 0% bank 1 deviation and 6.4% bank 2 deviation. which I suppose is quite an imbalance in the engine timing. I think at this point the wise decision would be, drop the engine. replace bank 1 and 2 variocam plastic things and solenoids. re time the engine from scratch. preventative ims and rms replacement and trans fluid, and then put the car back together. does this diagnosis make sense?

[kbod]

Originally Posted by blue62

should be a way to test all three valves you mentioned. Do a search here on the forum for EVAP system.
Should be lots of info. Evap system problems are a somewhat common issue here on the forum.
I think the tank vent valve is the one mentioned on the video that causes the hard start problem after refill.

The car is giving a code for an evap vent issue, but based on the live readings it seems to be a mechanical timing issue on bank 2 oddly enough, ill pull all 4 cams and replace the plastic guides and further diagnose.

[Dllrd23]

If I could throw in my 2 cents. I would not drop the engine until I checked/replaced the canister purge valve and or canister purge solenoid. On most setups there are normally closed valves. When they stick open and you fill your tank it pushes all those vapors from your tank to your intake. Will cause engine to run rich due to the unmeasured hydrocarbons in the combustion process. O2’s will pick up on that in closed loop and try to cut injector pulse width to compensate. Thus running ****************ty after car is in fuel control (closed loop). Probably why it doesn’t run like crap for the first 30-60 seconds depending on how long o2’s take to warm up.

[sfkjeld]

I just saw this thread. For what it’s worth, I’ve been fighting the P1341 CEL code for nearly a year. No luck. Am told bank one is off 6 degrees. Yet the car runs perfectly. Surprisingly (to me), it has passed CA smog test twice in the last year. I have the CEL cleared at a Porsche shop and they take it to the smog station. Evidently the test itself does not create the conditions to throw the CEL. But both times, within 30mins of picking up the car at the shop, the 1341 CEL comes back. I’ve decided to just live with it. I know it has little resale value now so I will just drive it until something breaks that I don’t want to pay to fix. Kind of liberating actually. I don’t worry about the car as I had with my old 911’s. And I hate to admit it, but the 986 is actually more fun to drive than my 70’s 911 cars. Good luck with your car. I’ll be watching for updates.

Below is the 1341 thread, which you’ve probably seen.

Variocam thoughts and questions