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Joined: 21 Mar 2011
Posts: 162

PostPosted: Tue Mar 22, 2011 9:51 am    Post subject: Crank / Hall sensor Reply with quote

I changed the crank sensor a few months back, thought these pics may be useful - I'll put some more text in when I get time later.

*edit* descriptions now below, symptoms of faulty crank / speed sensor are turning over but no spark / failure to fire up and start. Engine cutting out randomly (especially when hot / running temp). Engine won't re-start until engine has cooled (symptoms similar to vapour lock).

Unclip lead going from sensor to connecting block and pull free. Then loosen the bolt that holds the sensor on. A tip for this is to run the car until at operating temp and continue to run for a while, the heat will free the bolt. It's a hex bolt, so is easy to round off and chances are it will be in there tight.

Twist sensor and pull, you may need to twist back and forth a few times to loosen it so you can pull it out.

Unclip Variocam actuator lead from bracet, undo bolt connector bracket from block and pull free.

Disconnect hall sensor plug from bracket

Remove sensor, clean bracket up if required

remove old connector from bracket

Slide new sensor connector into bracket

Replace is in the reverse order (haynes style lol).

Job time, 45 mins should about do it including getting the car up and wheel removed etc. Take the car for a good run first to heat up that bolt though, and wear gloves so you don't get burnt.

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911 AU

Joined: 28 Oct 2013
Posts: 124
Location: Worcestershire

PostPosted: Sun Jul 23, 2017 8:38 pm    Post subject: Reply with quote

Great post.

For anyone else thinking of changing the crank sensor: 10mm bolt holding bracket onto engine, all done from underneath, just the nsr wheel to be removed.

Thanks fella
Dead 996.1 C2 Cab Tip
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