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ceci Alfa Arna
Joined: 17 Apr 2008 Posts: 15
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Posted: Thu Apr 17, 2008 11:35 am Post subject: p4 problems |
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my p4 electromagnetic coupling disengages after driving for about half an hour and reverts to front wheel drive (4x4 light illuminated)
if i turn the engine off for about 15 mins and restart the electromagnetic coupling re-engages .
after about half an hour of driving it disengages again.
any one have any ideas????????
please help
rgds |
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Admin Site Admin
Joined: 19 Feb 2003 Posts: 1223 Location: Stafford, UK
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Posted: Thu Apr 17, 2008 12:48 pm Post subject: |
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Hi
Most common thing that seems to trigger the 4x4 to disengage is the adjustment of the 2 brake light switches on the P4.
All the best
Keith _________________ I owe, I owe, its off to work we go.
Bimota Forum
Stafford Christmas Lights
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ceci Alfa Arna
Joined: 17 Apr 2008 Posts: 15
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Posted: Thu Apr 17, 2008 1:56 pm Post subject: |
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one thing i didnt mention is that when i start the car you can hear the engagement (a click) and even when i just let the car idle without driving or touching the brake , just simply letting it idle for a while it still disengages and the 4x4 warning illuminates..............it seems that the sensor is subjected to heat and turns itself off or something!
i have checked the earth connection for the sensors and they seem fine.
it has me baffled as it just happened without any particular reason. |
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paulhide P4
Joined: 20 Dec 2003 Posts: 1607 Location: Oh Beautiful Billingham
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Posted: Thu Apr 17, 2008 2:45 pm Post subject: |
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How long idling before it disengages? Most likely fault is tooth mesh sensor which locates at the back of the gearbox in front of the propshaft tunnel. Its wires come through the floor to a three pin connector behind the centre console coming from the sensor. (don't mix it up with another 3 pin connector in a similar place or thye wires coming from the electro-magnetic coupling.) There are two wires going to the sensor and an open shielding wire. Use a resistance meter to see if there is a circuit when the system is running and when it is not. _________________ Owner's Club 33 Registrar. Now from P4 & S2 1.7 QV
http://www.alfa-pages.co.uk/viewtopic.php?t=5188 |
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ceci Alfa Arna
Joined: 17 Apr 2008 Posts: 15
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Posted: Fri Apr 18, 2008 10:22 am Post subject: |
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thankyou for your response i appreciate it very much.
the car needs to idle (or be driven ) for about half an hour.
i will check the resistance in the wires when it cuts out..........maybe heat fatigue due to a dodgy sensor?
I wonder if these sensors are still available?
anyone know?
rgds |
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paulhide P4
Joined: 20 Dec 2003 Posts: 1607 Location: Oh Beautiful Billingham
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ceci Alfa Arna
Joined: 17 Apr 2008 Posts: 15
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Posted: Mon Apr 21, 2008 4:12 am Post subject: |
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who do i contact to purchase the sensor?
an email or web address would be appreciated
thanks
oh by the way i am from australia |
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