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YOUR RESEARCHAOS Manometer Test
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Use durametric
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No successful repair reported for this finding.
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Read evidence and context
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Leading evidence: 'Use durametric' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Test air oil separator' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
This test will allow you to find if you have a vacuum leak and where to find it.
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11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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Generation: 20261027T035758Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi Guys, I did a manometer test today on my AOS. I think the reading is low. The car was not at full operating temperature but it was not cold. This reading was taken it tick over.
Yeah it is a bit low.
But you need your oil to be at 90ºc.
Mind you, no oil temp guage on a 996. Is it in the hidden climate menu?
If not, do you not what your idle pressure is when it is up to temperature?
I would not consider measuring until it is down to at least 1.5 bar at idle. That could be a good 5-10 miles of driving with current ambient temps.
Most seem to be around 3.8-5.5 for a really good one. But, lower is better. When they fail you get it reading around 10-15.
But no point doing it until fully up to temperature.
Crankcase/vacuum leak. What fuel consumption numbers are you getting? Oil consumption? What car have you got?
Depending on what scanner you have, datalog the car for fuel trims. Low numbers normally point to crankcase, AOS issues.
Porsches are very good at hiding problems until they don't. Once you start digging deeper, the real health of your car will reveal itself.
I bought this machine:
https://www.amazon.co.uk/Automotive...lpcontext&ref_=fplfs&psc=1&smid=A3L5OEAG0LKOI
I can't remember how much I paid for it, but it helped me find a huge leak in the crankcase ventilation hose in a MY03 Boxster S with the M96.24 engine. I think it'll be easier to smoke test in the 911 - LN Engineering have a good video on how to smoke it via the intake. This test will allow you to find if you have a vacuum leak and where to find it.
I use Durametric to datalog. It'll show fuel trims, particularly RKAT, which is effectively a vacuum measure at idle. Crankcase leaks tend to increase the RKAT number, but won't throw a CEL until the figure is above 10% or so. This will sound like mumbo jumbo until you start exploring.
For now, smoke test it, clean the intake and throttle body and see if an issue shows up from there. If not, get your wallet out or just get on with your life and drive the thing. When it wants to tell you something, it will. Porsches have a habit of doing that.
