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Thread: Replaced 'stat- still not right.

  1. #1
    Regular Member jimmyred's Avatar
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    Default Replaced 'stat- still not right.

    Following advice from this forum, I suspected that the source of the problems I had with my 03 1.8 petrol was a seized thermostat (temp gauge never moved, emissions light on, heaters poor, guzzling fuel and also misfire caused by burning rich maybe).
    I replaced plugs last week and this cured misfire, although as week went on it did occaisionally do it again. I assumed that the rich mix was responsible.
    Then yesterday I replaced thermostat (just valve, not housing, as temp sensor seemed to be working when I tested it by unplugging, despite damage to cable.)
    This worked as expected- mostly:
    The heater is now great, and the emissions light went off after a while. The coolant doesn't seem to be leaking, fingers crossed. The car just feels better, as it is now running at correct temp (I hope!) BUT, the tenp gauge is still not working. I had wondered if it was broken, before I changed stat, as I have never seen it move off bottom, unlike other people who said that it would sometimes rise slightly.
    The old thermostat was definately knackered; I had to free it from housing with pliers.
    To add to my bafflement the emissions light has returned, and I have also noticed a slight hesitation/misfire when changing gear. It's nothing like as bad as before, but still, something is wrong. I took one of the new plugs out today for a look; it was slightly black but I wouldn't have thought enough to cause problems.
    I am just gonna run the car for a bit and see if these problems iron themselves out. I disconnected battery last night in the hope that the computer will "relearn" that thermostat is now working.
    It all becomes a bit complicated if you follow cable up from sensor. As I say there is some damage close to thermostat housing, but the sensor is still working because when you unplug it the fan comes on continuously. Maybe the problem is at other end, close to the dashboard?
    Any advice on this would be really helpful. It's doing my head in. For most of yesterday I was really chuffed that I'd fixed it, despite the gauge not working, but now the light and misfire have come back I am at a loss.
    Fault codes read using pedal test:

    1565: speed control command switch out of range

    1482: SCP ?

    1481:Fan secondary low with high fan on

    0301: Cylinder 1 misfire detected

    0115: engine coolant temp circuit malfunction

    0567: cruise control something or other

    some of these are old I think.
    Last edited by jimmyred; 9th January 2011 at 19:27.

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    enlighten me on this pedal test thing as my eml comes on and off periodically .
    cheers

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    Regular Member winnie2457's Avatar
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    Misfire could be down do a dodgy coil pack not uncOmmon on Vauxhall if you have changed plugs and it's still doing it then could be coil pack

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    Regular Member jimmyred's Avatar
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    ok thanks winnie. I guess I could test that by swapping plugs round. If misfire doesn't move then must be coil pack? Could misfire be behind emissions light? I am sure new stat is working correctly.

    Pedal test is on page 4 of How 2's. Doesn't seem to be in index. "How 2 read codes for free without equipment" then what the code mean is a sticky at head of main troubleshooting forum.

    Anyone know how to get behind temp gauge/dashboard for look?

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    Regular Member winnie2457's Avatar
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    Yup misfire can cause car too run too rich which lamba sensors can pick up on and even the ecu can pick up a misfire and throw up eml I bet it's a coil pack has gone mate

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    Regular Member Caveman_nige's Avatar
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    Vehicle : Insignia

    Trim : Elite

    Engine : 1.6T SIDI Petrol

    Year : 2014

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    which cylinder is 1? do they number the from left to right?

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    Regular Member jimmyred's Avatar
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    I wondered about that too!

    Is the coil pack the whole ignition unit above plugs or just the bit above each plug?

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    Regular Member jimmyred's Avatar
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    just googled it its the whole thing isn't it. About 40 quid. I'll try that come payday then. Cheers.

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    Regular Member Caveman_nige's Avatar
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    Vehicle : Insignia

    Trim : Elite

    Engine : 1.6T SIDI Petrol

    Year : 2014

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    cylinder 1 is at the timing belt end in case that helps..

  10. #10
    Regular Member jimmyred's Avatar
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    thanks. I had decided it must be but good to know for sure

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