Question about 2002 Volkswagen Golf

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Polo 1.2 12v does not rev over 3k

Hi, got a problem bought a vw polo 1.2 12v from auction and it has had some work done on the engine. it does not rev over 3k. checked cam sensor, seems to be ok. i have been told that the timing chain maybe out of line. is that possible. 02 reg. 57k on clock. help!!!!!!!!!!!

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Hi guys just about to do timing chain on vw polo 1.2 just wondering if any one knows where crank locing pin locates

Posted on Jul 03, 2009

Guys thx for your helpful advice, nice to know there are caring ppl out there, ok the led trick, well its simple remove the camshaft sensor out of the car, connect wires to the small connectors in the senser, add a 5v batt to give power. then just use anything thats metal and wave at the bottom of the sensor. this will make the led flash. Which shows the led works. let me know if you need more detail.

My car im going to now check if the timing is right, i have to buy a special timing tool around £50. if thats correct then check air sensor as you kindly suggested.

Posted on Jul 03, 2008

Thank you for your suggestion, i have taken the car to a garage where they did plug in a vag-com, the vag-com did read a cam sensor fault. however i checked the cam shaft sensor with the old led trick, turns out the sensor is fine. another mechanic did say the timing chain might be out one or two notchs? what do you think?

Posted on Jul 02, 2008

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I can only recommend that you get a VAG diagnostic check done - either by a VW equipped repair shop or you can do it yourself if you have a laptop computer and about £15 for the interface cable.
It might even be in "limp mode" but 3k rmp seems a bit high for that.
I hope this helps.
If these suggestions do help you solve the problem, please give my reply a rating to help others judge my knowledge / guessing skills. If they do not, please add a comment with more details so I can try to help you further. Cheers, D

Posted on Jul 01, 2008

  • Richard Raynor Jul 03, 2008

    Hi mcvix,

    My own experience is with 93 petrol Golf, 96 TD Passat and 97 TDI Sharan, so please bear that in mind when reading the following :-)

    Herr Volkswagen's cars have fiendishly complex engine management systems, and the timing etc is influenced by a variety of sensors. If one sensor fails to give a sensible signal the ECU will ignore that and go to the "next best" source of information and if that one is talking gibberish too it will default to a factory setting which should get you home.

    I think the crankshaft position sensor may be higher up in the chain of authority than the camshaft position sensor, so it might be worth looking at that too. A working sensor might not be sending its data to the ECU if the connector is dirty / faulty. I understand that air and water temp sensors also affect the timing. Finally, for now, the Polo coil packs seem to cause problems and would be worth checking.



    The bottom line is that the timing can be thrown out by a variety of things which in the "old days" wouldn't have made a ha'porth of difference and I'd be surprised if your chain is to blame. And of course the "cam chain" controls the valve timing, not the ignition timing, I think.



    Hope this helps you in some way to understand how difficult it is to understand modern engines. The computers aren't there just to look pretty :-)



    What is the "old led trick" please? D.



  • Richard Raynor Jul 03, 2008

    And we haven't even mentioned "injection timing" yet !

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