When you get it back together, try this test. A 14mm or 9/16" hose slips over and seals on the dip stick tube. Then get creative to adapt it down to a smaller diameter to make it easier to see the vacuum. I tried a real vacuum gauge, but it was hard to get a meaningful reading at such a low vacuum level. If yours is blowing out air instead, that's very likely the root of your issues.
Re: Kroon Harness for 944 Turbo
Posted: Fri Apr 17, 2026 2:37 am
by chrischrischris
I saw your latest video with the turbocharger reinstalled. How is it running now?
Also, I'm curious about the specs on your turbo. Are you using the stock fuel injectors?
Re: Kroon Harness for 944 Turbo
Posted: Fri Apr 17, 2026 6:33 pm
by NCGermerican
chrischrischris wrote: Fri Apr 17, 2026 2:37 am
I saw your latest video with the turbocharger reinstalled. How is it running now?
Also, I'm curious about the specs on your turbo. Are you using the stock fuel injectors?
Unfortunately it runs exactly the same. I also did a smoke test (off camera) of the crank case only through the dipstick tube and it is sealed tight. I did both another smoke test and a boost leak test- nothing. Everything is sealed tight.
I did the test that Tom showed in his previous post and there is still positive crank case pressure. At this point, I’m truly at a loss.
I am still using stock injectors. They were cleaned an verified to be 4.5 ohms.
I have an email out to Joe at F9 to see if it could possibly be something with the F9 DME or the LR MAX HP CHIP. If it’s not any of those, I’m just going to drive the car and see what happens.
Oh and to make it even better, I’m leaking oil from the brand new oil thermostat cap, so now I get to do that job AGAIN but using high temp sealant on the threads. Yay. Let’s hope I don’t put another chip in the header panel…..
chrischrischris wrote: Fri Apr 17, 2026 2:37 am
I saw your latest video with the turbocharger reinstalled. How is it running now?
Also, I'm curious about the specs on your turbo. Are you using the stock fuel injectors?
Unfortunately it runs exactly the same. I also did a smoke test (off camera) of the crank case only through the dipstick tube and it is sealed tight. I did both another smoke test and a boost leak test- nothing. Everything is sealed tight.
I did the test that Tom showed in his previous post and there is still positive crank case pressure. At this point, I’m truly at a loss.
I am still using stock injectors. They were cleaned an verified to be 4.5 ohms.
I have an email out to Joe at F9 to see if it could possibly be something with the F9 DME or the LR MAX HP CHIP. If it’s not any of those, I’m just going to drive the car and see what happens.
Oh and to make it even better, I’m leaking oil from the brand new oil thermostat cap, so now I get to do that job AGAIN but using high temp sealant on the threads. Yay. Let’s hope I don’t put another chip in the header panel…..
Ug, sorry. How much pressure was coming from the dip stick tube? Gentle like my vacuum (but in the other direction), or pumping like a little exhaust pipe? It's either blowby, or the AOS system isn't scavenging pressure for some reason. If you rev it to 3k and hold it there, does the pressure at the dip stick tube increase, decrease or stay the same?
How much pressure was coming from the dip stick tube? Gentle like my vacuum (but in the other direction), or pumping like a little exhaust pipe? It's either blowby, or the AOS system isn't scavenging pressure for some reason. If you rev it to 3k and hold it there, does the pressure at the dip stick tube increase, decrease or stay the same?