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Hi Arie, thanks for both movies, I checked them and noticed that your plate is a bit higher in the Venturi opening than mine. If I follow the official guidelines of kjet, yours should be a bit lower. Nevertheless, your car starts fine. So I don’t think it is an air metering plate issue.
Lately my car starts much better after setting my mixture again and when pressing gas pedal a bit down to let more air and better start.
So I suspect my injectors are leaking although they are renewed 5y ago….
Sorry @GerritD - I missed your question regarding adjustment of the AAV.
First you’ll need to drill out the rivets and replace with bolts and nylocs.
Then, without the wife seeing, put it in the freezer for an hour. This will open the valve to max position. On mine this is now when that little notch (see pic) is a few mm from the edge - I.e. the valve doesn’t fully open. NB - the pic below was taken before adjustment and engine wasn’t fully warm.
To adjust - with valve dissembled - carefully grip the bi-metallic strip with a pair of pliers and gently bend it according to the adjustment you want to make. The valve part is spring loaded so when you re-assemble i found inserting a plastic pen to hold it open helped.
To test warm I use a 12v power source on the valve for at least 10-15 mins. The valve nearly fully closes - you see prob about 1mm of that same notch. If you found it was more open than this I would adjust back slightly - it might not matter if it’s open a little more though, as long as you can adjust the difference with the idle screw I suppose.
As mentioned you will need to adjust your idle speed.
My car starts a lot quicker now so pleased with the result. Let me know how you get on!
Cheers
Hi Chopperharris,
I opened up my AAV , modified it so it has more opening.
These are the results :
at 2° Celsius at 24° Celsius Closed after 10 minutes of heating via 12V only.
So now, I just need to test it on the car.
I'll keep you informed.
Hi Ben, unfortunately not. I am now testing one by one all pressures and Kjet components.
So far all pressures are according to the wsm.
I just need to check my warm control pressure.
As for the fuel delivery output from my FD, there I have an issue: I only get 400cc /30 secs instead of 1120cc.
Could this be the root cause?
From: Holden Beach and Winston-Salem, North Carolina 82 928 Euro S 5spd MOSS GREEN/CHAMPAGNE-04 996 C4S CONV TIP POLAR SILVER/METROPOL BLUE
Originally Posted by GerritD
Hi Ben, unfortunately not. I am now testing one by one all pressures and Kjet components.
So far all pressures are according to the wsm.
I just need to check my warm control pressure.
As for the fuel delivery output from my FD, there I have an issue: I only get 400cc /30 secs instead of 1120cc.
Could this be the root cause?
You do know about the thing that screws into the FD with the shims and spring that controls system pressure?
You do know about the thing that screws into the FD with the shims and spring that controls system pressure?
Yes , I know : the system relieve valve
This controls the system pressure and also the rest holding pressure
But this has been renewed together with the FD.
System pressure is 5,3 bar (76 psi) and rest pressures are 2.7, 2.6 and 2.5 bar after 10, 20 and 30 minutes…so all good.
Fuel damper? Maybe a rubber hose has a pocket inside and is clogged? I would measure at the pump if you have different flow rates. 400 ml isn‘t much.
Hey, you gave me a great idea to do some more testing.
I can check my fuel delivery starting at the output of my WUR, then input of WUR, next output of fuel damper and finally directly on top output of my FD.
This way I know at what point my fuel delivery has been drastically lowered.
The input of my FD has about 1800 ml so I should at least have 1000ml at the outlet of my FD
Fuel damper? Maybe a rubber hose has a pocket inside and is clogged? I would measure at the pump if you have different flow rates. 400 ml isn‘t much.
I have question regarding the cold control pressure : there are several references of what it should be for 928S kjet (M28.11/12) :
1. version of porsche wsm specs : 0,9 till 1,3 bar @ 20°C
2. version of WUR specs : 1,4 till 1,8 bar @ 20°C
so what is the correct CCP?
Currently I have 0,7 bar @ 11°C….but this would mean according to my WUR 0438.140.036 that I should have 1,1 bar instead.
06-03-2023 | 10:01 AM
