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Thread: Help required diagnosing problem please

  1. #1
    Newbie FrankyEight's Avatar
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    Help required diagnosing problem please

    Hi guys

    I've got a '94 2.0 16v which has the following issue; once the car get's up to temperature, the idle rises from normal (750rpm ish) to 1000rpm and stays there until I 'reset' it by switching off engine and back on again. Even then, after a few minutes of driving it'll rise back up to 1000rpm. I've been told this might be the ISV (idle stabilisation valve?. If so, could someone advise how I remove this and clean it and refit (I'm clearly a novice!). Also, I've been reading that it may be the temperature switch or thermostat? I'm not sure of the difference, again some advice on what the difference is and how they can be replaced would be greatly appreciated.

    Many thanks in advance!
    1994 SHERRY PEARL 16V

  2. #2
    IMHO it's much more likely this is a result of a sensor fault on the engine. Do you have accecss to a diagnostic code reader? VAG-COM or one of the older two-wire diags tools should be able to query the 2.0 16v engine iirc.
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  3. #3
    Newbie FrankyEight's Avatar
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    Quote Originally Posted by dr_mat View Post
    IMHO it's much more likely this is a result of a sensor fault on the engine. Do you have accecss to a diagnostic code reader? VAG-COM or one of the older two-wire diags tools should be able to query the 2.0 16v engine iirc.
    Thanks for your reply dr_mat — I don't have access to VAG-COm or the other diags tools... do general garages have this equipment or should I find a VW specialist who does? I'm in Surrey. Cheers!
    1994 SHERRY PEARL 16V

  4. #4
    Also some prehistory:

    https://www.honestjohn.co.uk/forum/p...ex.htm?t=27965

    Generic reader should work but be aware it's an early four-pin connector not the later SCART socket type. You may as well just get your multimeter out and check the engine temperature sensors have the right resistance.
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  5. #5
    Newbie FrankyEight's Avatar
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    Thanks — post is really interesting and sounds just like my issue — do you know where the temperature sensor for the engine management system is located exactly so I can check and replace if necessary? Thanks for your patience...
    1994 SHERRY PEARL 16V

  6. #6
    I believe they're usually on the thermostat housing, but that might just be the VR6 I'm thinking of!
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  7. #7
    Newbie FrankyEight's Avatar
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    Quote Originally Posted by dr_mat View Post
    I believe they're usually on the thermostat housing, but that might just be the VR6 I'm thinking of!
    Thanks. Regarding VAG-COM, I might buy a generic reader from eBay or somewhere. They all seem to be SCART. Do I need a 4-pin adapter for this or do I need a specific 4-pin Reader? Cheers again!
    1994 SHERRY PEARL 16V

  8. #8
    Newbie FrankyEight's Avatar
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    Quote Originally Posted by FrankyEight View Post
    Thanks. Regarding VAG-COM, I might buy a generic reader from eBay or somewhere. They all seem to be SCART. Do I need a 4-pin adapter for this or do I need a specific 4-pin Reader? Cheers again!
    Think I've found an adapter!
    1994 SHERRY PEARL 16V

  9. #9
    Check the compatibility. Even the early VWs with the SCART-type connector didn't actually speak full OBD2 protocols so the reader needs to be aware of this. I've never attempted to get one for a 2.0 16v. You can still get the 4-pin adapters with USB connected dongles that will work with the old 3.11 version of VAG-COM (which is still free from what I recall).
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  10. #10
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    Could be an air leak? Check all vacuum piping around the engine bay going too / from the manifold etc for splits etc allowing air to enter the engine when the throttle is closed

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