2001 Boxster Camshaft issues

[kbod]

Originally Posted by blue62

You have the cam deviation on bank 1 down interesting that it still throws the code and missfires.

Is it time for a smoke test? Or maybe the fuel tank vent valve is shot which is causing the gas station fill up issues and the stalling at red light issue? to which my concern is. If my fuel tank vent valve was bad, wouldn't driving the car without a gas cap allow for it to "vent" and run right or would the siphon prevention valve still seal the tank off. I am running out of things to replace and go over. One thing I will add is that before I replaced the variocam solenoid/actuator, the car would run perfect, but after I took it past 3,000 rpm it would idle bad since the variocam actuator would stick. but now it doesn't stick and the car always runs like crap below 1k rpm... why does the car still run so bad?

[blue62]

Originally Posted by kbod

Is it time for a smoke test? Or maybe the fuel tank vent valve is shot which is causing the gas station fill up issues and the stalling at red light issue? to which my concern is. If my fuel tank vent valve was bad, wouldn't driving the car without a gas cap allow for it to "vent" and run right or would the siphon prevention valve still seal the tank off. I am running out of things to replace and go over. One thing I will add is that before I replaced the variocam solenoid/actuator, the car would run perfect, but after I took it past 3,000 rpm it would idle bad since the variocam actuator would stick. but now it doesn't stick and the car always runs like crap below 1k rpm... why does the car still run so bad?

I would think that your issues with the EVAP system contribute to your stalling issues.
I am not schooled on all aspects of EVAP system operation but I do know it is constantly testing for vacuum integrity. It looks like a simple system but access to all the hoses and parts looks like a PITA.

If you are still throwing the P1341 code then something is still off with the timing.
If the car ran well below 3000 RPM before the actuator change out and now it does not. Then something is not right with the cam timing, the actuator, sensor or the DME/ECU.

Your timing code issue is a big issue perhaps you need a fresh set of eyes on the issue. Cam timing affects vacuum, fuel mileage, idle, power, and is most likely the cause of the miss fire codes.
I will have a friend who is also a car nut look at an issue when I am stumped just to get fresh eyes on the issue. Sometimes he sees something that I missed or just didn't see as set up wrong.

Another thing is in your posts you have mentioned that most of the SAI hoses were toast or not hooked up.
The hard starting at fill up.
The sticking actuator.
So it sounds like the car was not maintained well and that you have multiple issues in various systems.
Sorry I am not more help

[Gilles]

I believe that tonight, Tony Callas will be doing a "how to find vacuum leaks" this may ne of interest to you

https://www.youtube.com/playlist?list=PLKNhSePDKmOzZyk3PWKu8OfQkDW2RmFSH

Good luck troubleshooting and fixing your car!

[kbod]

Originally Posted by blue62

I would think that your issues with the EVAP system contribute to your stalling issues.
I am not schooled on all aspects of EVAP system operation but I do know it is constantly testing for vacuum integrity. It looks like a simple system but access to all the hoses and parts looks like a PITA.

If you are still throwing the P1341 code then something is still off with the timing.
If the car ran well below 3000 RPM before the actuator change out and now it does not. Then something is not right with the cam timing, the actuator, sensor or the DME/ECU.

Your timing code issue is a big issue perhaps you need a fresh set of eyes on the issue. Cam timing affects vacuum, fuel mileage, idle, power, and is most likely the cause of the miss fire codes.
I will have a friend who is also a car nut look at an issue when I am stumped just to get fresh eyes on the issue. Sometimes he sees something that I missed or just didn't see as set up wrong.

Another thing is in your posts you have mentioned that most of the SAI hoses were toast or not hooked up.
The hard starting at fill up.
The sticking actuator.
So it sounds like the car was not maintained well and that you have multiple issues in various systems.
Sorry I am not more help

I went back again and changed the timing. we are now at -0.36 for camshaft position 1 deviation, and -6.22 for camshaft position 2 deviation. When I first started the car the actual angle for camshaft bank 1 was 0.37 and the actual angle for bank 2 was 7 degrees but after i drove the car they both would switch to 22-24 once variocam engaged, and would go back to 0 at idle. but now the car is significantly worse at idle, and it stalls at every single stop light no matter what. It stalls even when I'm moving if I'm not going fast enough.


Yes the car was obviously neglected and sat for years before I bought it. poor little thingy has a million billion issues, its power seats don't work, convertible top gears don't work, drivers door lock don't work, paint is faded... cv axles are done..... I am going to order a smoke tester and test the vacuum system for air leaks next. as far as codes its the same p1341. For the evap system what should I order and replace first to get started ruling pieces out? It must be something significant Because the car idles like a muscle car with a cam.

[blue62]

Originally Posted by kbod

I went back again and changed the timing. we are now at -0.36 for camshaft position 1 deviation, and -6.22 for camshaft position 2 deviation. When I first started the car the actual angle for camshaft bank 1 was 0.37 and the actual angle for bank 2 was 7 degrees but after i drove the car they both would switch to 22-24 once variocam engaged, and would go back to 0 at idle. but now the car is significantly worse at idle, and it stalls at every single stop light no matter what. It stalls even when I'm moving if I'm not going fast enough.


Yes the car was obviously neglected and sat for years before I bought it. poor little thingy has a million billion issues, its power seats don't work, convertible top gears don't work, drivers door lock don't work, paint is faded... cv axles are done..... I am going to order a smoke tester and test the vacuum system for air leaks next. as far as codes its the same p1341. For the evap system what should I order and replace first to get started ruling pieces out? It must be something significant Because the car idles like a muscle car with a cam.

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????

[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.