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TDCi ignition question

Discussion in 'Motors' started by Trojan, 24 Jan 2006.

  1. Trojan

    Soldato

    Joined: 19 Sep 2003

    Posts: 5,319

    Location: Adelaide, Australia

    Just a quick question, my Dad recently bought a Mk3 Mondeo TDCi. He's been looking the the handbook and has come across a section regarding the ignition. It states that after he has put the key in the ignition, a "coil" light should appear on the dash. After 3 seconds this should disappear and then it is safe to turn the key and start the engine. Does this sound correct?

    If so, why? What damage, if any, will be caused by him just turning the key straight away without waiting for the coil light to disappear?
     
  2. Scottland

    Capodecina

    Joined: 18 Oct 2002

    Posts: 15,211

    Location: North Wales

    Sounds like the light for the heater plugs. If he turned the engine over before the light goes off, it might cough a little before it starts (or it might not start at all). But on most modern deisel cars the light goes off very quickly, much quicker than 3 seconds. They probably state 3 seconds, because it can be anything upto 3 seconds.
     
  3. Hate

    Soldato

    Joined: 18 Oct 2002

    Posts: 7,175

    Location: Sussex

    yeah that sounds right for diesels

    you have to let the glowplugs warm up to get a nice clean start :)
     
  4. blueboy2001

    Mobster

    Joined: 18 Oct 2002

    Posts: 4,881

    The glow plug light on the TDCi's does come on for 3 seconds, but its because it also doubles as the engine management light. The 3 second is whilst the engine checks all its sensors - if there is a problem the light will start flashing.

    If its above freezing a TDCi should have no trouble starting on the first turn of the key. I've owned 2 and driven loads of them and never waited for the light to go out.
     
  5. Fusion

    Capodecina

    Joined: 18 Oct 2002

    Posts: 10,461

    Location: Notts

    On the 1.8 TDCi Focus 115ps, the glow plug light literally flashes on for no more than half a second on starting. You can crank it straight up.
     
  6. Iceman

    Mobster

    Joined: 6 Mar 2004

    Posts: 2,793

    Location: North Wales (Flintshire)

    Dont really need the glow plugs they are there for emissions
    Yeh as said it doubles up as you mil light
     
  7. Dogbreath

    Capodecina

    Joined: 18 Oct 2002

    Posts: 16,651

    Location: Devon

    They are there on most diesel primarily to help start the engine. If you've ever had to start an old diesel in winter with knackered glow plug you would know how reluctant they can be to start.
     
  8. NickXX

    Soldato

    Joined: 19 May 2005

    Posts: 7,031

    Yeah, I have a new golf and you can start straight away (glow plug light turns off after a second anyway). As the above posts suggest, it's really for when the car is knocking on a bit - they will particularly help on cold mornings.
     
  9. Iceman

    Mobster

    Joined: 6 Mar 2004

    Posts: 2,793

    Location: North Wales (Flintshire)

    Yeh i know the old 1.8 diesels (fords) are a bitch used to get them in every other week for hard to start
    Mainly due to glow plugs
     
  10. Trojan

    Soldato

    Joined: 19 Sep 2003

    Posts: 5,319

    Location: Adelaide, Australia

    So, in a nutshell, there's going to be no issues turning the engine on straight away, although if it's really cold out it's best to leave it a second or so to let the plugs warm up?
     
  11. kaiowas

    Capodecina

    Joined: 18 Oct 2002

    Posts: 10,212

    Location: Castle Anthrax

    Best thing is to just get into the habit of "Get in. Key in. Ignition On. Belt up. Start Car." The couple of seconds you spend putting your seatbelt on will be long enough for the glowplugs to warm up and you don't have to make a conscious effort to wait for the light to go out.
     
  12. blueboy2001

    Mobster

    Joined: 18 Oct 2002

    Posts: 4,881

    Spot on.
     
  13. minidan

    Hitman

    Joined: 23 Oct 2002

    Posts: 747

    Location: leeds/bradford

    i found this out the hard way lol, 2 glow plugs gave up on my nova and it just dident want to know even after about 10 mins of turning over. just white smoke. sorted with 2 new plugs tho.

    -boring stuff i know-
    indirect injection diesels are much harder to start when cold (like my nova) and rely on glowplugs. direct injection engines dont rely on them so much but they do make it easyer when its colder.
    direct injection is much louder and less eficiant i am told but makes more power and as stated start easyer.

    sorry, i just love diesels and wanted to share that lol.

    Dan - bored again.
     
  14. austinpowers

    Wise Guy

    Joined: 29 Sep 2003

    Posts: 2,435

    Other way round, DI is more effient as the fuel is squirted directly into the combustion chamber instead of into a swirl chamber on IDI.

    I need to wait for the light to go out on my Astra on these cold mornings ( 2 secs)

    DI's are getting quieter with CR and the like, my Astra is quieter than the pug 1.9dt's.