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Join Date: Mar 2003
Location: France
Posts: 134
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3,6 conversion erratic issues
Hello everybody
I am the next on the list looking for answers after reading a lot of similar but not exactly same issues  I think it's not necessary to write a long text to explain what happens when I can show this in video: https://youtube.com/shorts/1Ntx1oeC0Q0?si=E_K9IN_dH-0O_5Ul Then later, without engine starts: https://youtube.com/shorts/JhhMPtPf4J0?feature=shared Anyone has a clue from the root cause of that ? Thank's a lot for your help if you can. JM |
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08-14-2025, 01:40 AM
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Join Date: Jul 2008
Location: Finland
Posts: 401
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Is it the ICV which is making that weird noise?
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911-87 mit der 3.6 V-Ram und alles spaß |
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08-14-2025, 03:36 AM
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Location: France
Posts: 134
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Not only the ICV also all connected system such as bleeder and vacuum valves
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08-14-2025, 04:29 AM
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Join Date: Mar 2003
Location: France
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I hope that someone who faced the same issue will read my concern, today when I switched on ignition I've got the same "buzzing" noise so I managed to unplug one by one each socket ,ICV, venting valve, bleed valve, knock sensors, air flow meter, idle and full load switch, no change till I unplugged temperature sensor=> buzzing noise stops.
I checked resistance of this NTC temperature sensor which shows 1900ohms for 27°C, this is correct, so my question is there anybody who have had this kind of problem with temperature sensor? Is it possible that it could have spurious fault? Thank you JM |
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08-17-2025, 12:41 AM
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Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,511
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Can you identify what is rattling via a stethoscope?
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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08-17-2025, 08:18 AM
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Location: France
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I did, without stethoscope, I identify the ICV, shift valve resonance flap, tank venting valve which are rattling,I have checked the power supply of these components,,they are on the same line, it was 12,3 volts which is correct.
it's very difficult to understand because sometimes it quickly vanish and I guess that is related when the car completely stalls or has just some hesitations... |
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08-17-2025, 08:40 AM
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Registered
Join Date: Mar 2003
Location: France
Posts: 134
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I did, without stethoscope, I identify the ICV, shift valve resonance flap, tank venting valve which are rattling,I have checked the power supply of these components,,they are on the same line, it was 12,3 volts which is correct.
it's very difficult to understand because sometimes it quickly vanish and I guess that is related when the car completely stalls or has just some hesitations... |
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08-17-2025, 08:41 AM
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The DME pulls circuits to ground to actuate an output device.
Check the ground side of each device with a meter and get physical with the wiring, monitor for changes. Not an expert, just a logical step it seems to me.
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1980 911 - Metzger 3.6L 2016 Cayman S |
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08-17-2025, 06:04 PM
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Join Date: Mar 2003
Location: France
Posts: 134
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Thank you Ted.
I would like check but I think that the ground is monitored by the DME so I don’t know how to do. |
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08-18-2025, 11:31 AM
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