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Thread: Any auto electricians in the house? Glow Plugs...

  1. #1
    Regular Member Barlow's Avatar
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    Vehicle : Nissan 350Z GT


    Engine : 3.5 V6

    Year : 06

    Mileage : 50,000

    Default Any auto electricians in the house? Glow Plugs...

    The cold start issue with diesels. I think I may know what the problem is.
    Either the glow plugs aren't getting hot enough or the relay isn't keeping them on for long enough.

    Does anyone know if it's possible to use a hotter plug or, alternatively, modify the relay to stay on longer, or use a relay off a different car that does stay on longer?

    Thinking aloud: Use a relay and plugs off a vehicle manufacturer that does not suffer cold start problems?

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    Regular Member mrk's Avatar
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    Vehicle : vectra hatchback

    Trim : improving

    Engine : 1.9cdti mas remap

    Year : 06

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    i think just replacing the glow plugs should solve any problems with cold starting

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    Regular Member Barlow's Avatar
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    Quote Originally Posted by mrk View Post
    i think just replacing the glow plugs should solve any problems with cold starting
    Done that, and the relay. It's no better. In fact, it's worse than ever.

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    Change the coolant temp sensor it registers how cold the coolant is to send a signal to the timer for heat to the plugs.

    If this is a short and you not getting heat or enough this can be your problem it's a cheap fix.

    It may be saying "im hot engine" when it's -4...........

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    Regular Member Critch's Avatar
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    Have you checked the resistance through the glow plug circuit?

    We're the new glow plugs and relay genuine?

    theirs a sensor that detects manifold heat. Maybe take that out and clean it with carb cleaner/ electrical contact cleaner see if that helps.

    Does it start fine every other time and it is actually glow plug fault?

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    Regular Member Critch's Avatar
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    God damn double posting

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    Regular Member Barlow's Avatar
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    Quote Originally Posted by Bigtee View Post
    Change the coolant temp sensor it registers how cold the coolant is to send a signal to the timer for heat to the plugs.

    If this is a short and you not getting heat or enough this can be your problem it's a cheap fix.

    It may be saying "im hot engine" when it's -4...........
    I plan on doing that on Sunday

    Quote Originally Posted by Critch View Post
    Have you checked the resistance through the glow plug circuit?

    We're the new glow plugs and relay genuine?

    theirs a sensor that detects manifold heat. Maybe take that out and clean it with carb cleaner/ electrical contact cleaner see if that helps.

    Does it start fine every other time and it is actually glow plug fault?
    Genuine parts yes.
    And no, it always starts poorly in the cold or...less cold
    Not tested the circuit, I guess I should do that on Sunday

    I've just noticed that the battery is the wrong CCA for a diesel. It should be 680CCA, the one on mine is 420
    Great for a Nissan Micra I guess, and good for the tip too once the new one comes.

    I wonder if it's possible to extend the glow plug time through the serial input? You can with VAGs

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    Get a 12 volt lamp and connect pos wire to glow plugs and other to earth and switch to glow how bright is the bulb and how long for?

    If it blips a flash then stays out there's your answer, it should in theory stay lit for 4 seconds.

    Then it may switch off and come back on for 3-4 secs and repeat this twice, this is how some glow systems work in the past.

    To test plugs pull them out and see if they glow you can test in the head but you can't see how well it shines.

    You have to do some fault finding poke and hope won't work every time.!!
    Last edited by Bigtee; 24th February 2012 at 17:59.

  9. #9
    Regular Member Critch's Avatar
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    Change battery before you do anything else

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    Regular Member Barlow's Avatar
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    Critch, you posted without doubling!! A glorious day indeed.

    I didn't think of that Bigtee. I don't really want to remove the plugs unless I really really have too. Being a 120 it's a real pain in the ass.
    I'll try the lamp test, circuit and sensor. Replace the battery on Monday. If it still fails I'll look to increasing the glow time through the serial port.
    Failing that, I'll look for an Audi relay and stick that on.

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