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Thread: Out of ideas

  1. #1
    Regular Member ANDY GSI's Avatar
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    confused Out of ideas

    Hi all, done 2 threads at the start of the week about my sig 1.9 cdti 120 taking ages to start when left for a bit ( morning or after work) but fine 1st turn any other time? I am now truly stuck as I have replaced everything I thought might b to blame like the glows, coolant temp sensor, battery, glow plug relay and fixed vacum pipe and fitted outside temp sensor. After all this its still taking forever but when I remove the connection from the coolant temp sensor it starts 1st turn and that's a new sensor fitted so I'm totally at a loss? Think it will have to go into vauxhall now this was my 1st diesel think it will b my last, only had it a couple of months!

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    Regular Member Penfold101's Avatar
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    Could be the coolant itself that the issue mate - I don't know what part it plays with the starting sequence but it seems to be the main problem. Also, be aware that just because the sensor is new, doesn't mean it's working...

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    Regular Member ANDY GSI's Avatar
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    The coolant looks to have been replaced recently but how could this be a problem?

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    Regular Member Penfold101's Avatar
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    Quote Originally Posted by ANDY GSI View Post
    The coolant looks to have been replaced recently but how could this be a problem?
    Whatever reason the coolant temperature is part of the start sequence, the ecu is seen something it shouldn't. This is evident from that the car starts fine with the sponsor disconnected. If we assume the sensor is Working fine, then whatever value the ecu is looking for isn't correct. this would imply the coolant isn't quite as it should be, and the easiest way to sort that is to change it.

    Either that or you have a duff sensor or there's a problem with the plug on the wiring loom...

  5. #5
    Regular Member ANDY GSI's Avatar
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    When the coolant temp sensor is disconnected the glow plug light stays on for about 12 seconds which is longer than normal I know but the car starts 1st turn so I thought it might b the relay that times the glow that wasn't staying on long enough so I replaced that but still no joy?

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    Regular Member Penfold101's Avatar
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    Quote Originally Posted by ANDY GSI View Post
    When the coolant temp sensor is disconnected the glow plug light stays on for about 12 seconds which is longer than normal I know but the car starts 1st turn so I thought it might b the relay that times the glow that wasn't staying on long enough so I replaced that but still no joy?
    The ecu controls the glow plugs using the ambient temperature. When it's above 5 degrees (I think) it doesn't bother turning them on at all. It may take this reading from the coolant, judging that if the coolant is hot, the engine probably still is and the glow plugs won't be needed

    When you're disconnecting it, you're basically providing it with no reading at all, causing them to stay on through out the start sequence.

    It does sound like it might be glow pug related possibly, or something in the coolant system. Take the plug off and have a look at it. You could also try taking the sensor out and dipping it in some very hot water whilst trying to start it and see what happens....

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