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Thread: hunting idle..camshaft crank sensor question

  1. #1
    Regular Member Fash's Avatar
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    Default hunting idle..camshaft crank sensor question

    Recently the ol' 1.8 (2003 club) has started hunting idling, i have given the throttle body a clean, and as I had the same problem on my bmw 318 a few months ago, I reckon it's probably down to the camshaft crank sensor (as it was on the bmw)...
    How easy is it to change on the 1.8 ecotec ? If it's easy, wherabouts is it on the vec (pic with diagram would be a great help), and finally what part number from vx is it, or would there be somewhere on fleabay suitable (prices?)..
    I'd rather do it myself if I could to save some ££££'s

    Thanks very much for your help,

    Cheers,

    Steve

    PS Mine doesn't have an egr valve either, so I know it's not owt to do with that

  2. #2
    Regular Member Jezzy's Avatar
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    Camshaft is at the top of the engine, crankshaft is at the bottom - which one do you mean to refer to?

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    Full Member GazVXLINE170's Avatar
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    Vehicle : Insignia

    Trim : SRI VX-Line Nav

    Engine : 2.0 CDTI [170 PS]

    Year : 2015

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    Quote Originally Posted by Jezzy View Post
    Camshaft is at the top of the engine, crankshaft is at the bottom - which one do you mean to refer to?
    The crankshaft sensor and camshaft sensor are the same thing. The ECU uses the camshaft sensor to calculate the position/speed of crankshaft. Calibrated to the position of piston/cams of cylinder 1, the other cylinders are worked out position wise from this. Speed of the crankshaft is just the speed of the camshaft multiplied by two.

    The position of the camshaft/crankshaft sensor is on the top of the engine at the end (clutch/gearbox side) of one of the camshafts going by my engine (1.9CDTI) anyway.
    Last edited by GazVXLINE170; 4th July 2011 at 19:16.
    Insignia VX-Line Nav CDTI 170.

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    Regular Member Jezzy's Avatar
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    That depends on the engine - on mine there's a crankshaft sensor, but no camshaft sensor. The position of the camshaft is deduced by sending a small spark to each cylinder and seeing which one reports back that the cylinder has air/fuel mixture in it.

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    Regular Member Fash's Avatar
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    Quote Originally Posted by Jezzy View Post
    That depends on the engine - on mine there's a crankshaft sensor, but no camshaft sensor. The position of the camshaft is deduced by sending a small spark to each cylinder and seeing which one reports back that the cylinder has air/fuel mixture in it.
    Yeah I think it's probably just the one sensor-any idea where it is on the 1.8 ecotec ?

  6. #6
    Regular Member Das's Avatar
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    Vehicle : Lada

    Trim : Riva

    Engine : 6.0 V12

    Year : 1954

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    Camshaft sensor is on the top between the cam timing sprokets thingys(sorry cant remember there proper name). Remove the covers and its just 2 screws that hold it in and is easy to change.

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    Regular Member Fash's Avatar
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    Quote Originally Posted by DasArab View Post
    Camshaft sensor is on the top between the cam timing sprokets thingys(sorry cant remember there proper name). Remove the covers and its just 2 screws that hold it in and is easy to change.
    thanks mate. dont suppose you have a picture please? and wheres the best place to buy a replacement?

  8. #8
    Regular Member Das's Avatar
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    Vehicle : Lada

    Trim : Riva

    Engine : 6.0 V12

    Year : 1954

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    http://www.ebay.co.uk/itm/VAUXHALL-A...3#ht_687wt_698

    Thats basically it there. Was trying to find teh how2 for the z18xe but cant see it, im sure there would be a picture of its position in there.

  9. #9
    Regular Member Fash's Avatar
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    thanks mate, will get one on payday..just need a pic of it in there for clarity and away i go

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