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306 D Turbo Overheating

Discussion in 'Motors' started by Joe T, 24 Mar 2006.

  1. Joe T

    Capodecina

    Joined: 1 Apr 2003

    Posts: 11,728

    Location: Northampton

    Hi all

    I was just wondering if anyone could give a little advice.

    My brother has a 1997 306 DTurbo (Phase 2) which I sold to him a few weeks ago.

    In the last few weeks the temperature gauge has been reading too high. Normally it reads around 80, going up to about 90 in heavy traffic. Recently it has been reading anything from 90 to 110. Howeve,r it tends to be fairly stable, and even on a long run it doenst keep getting hotter.

    Is this liekyl to be a dodogy sensor, a dodgy thermostatic valve or something else?

    Any thoughts appreciated. Thanks :)
     
  2. Stonedofmoo

    Soldato

    Joined: 24 Oct 2002

    Posts: 6,245

    Location: Portsmouth

    Without sounding patronising have you checked the fluid is topped up?

    If not you could always flush out the system and do it again. They do get horribly gunked up over time.
     
  3. Matt82

    Capodecina

    Joined: 13 Mar 2004

    Posts: 16,600

    possible that the screw mod has screwed it too far.

    or. i had a 406dt years ago. its guage used to vary a lot. in normal use it would stick to 80, in traffic or when driven hard it would creep up to 100 ish.

    did no harm to my car and i suspected they were all like that. even put a new 'stat on it
     
  4. -Mike-

    Capodecina

    Joined: 22 Dec 2002

    Posts: 10,166

    Location: Minehead

    my first 306 got to around 85 if you were giving it some around town in first/second/third. It getting to 100+ is worrying. Check for coolant level/mayo and report back?
     
  5. -Mike-

    Capodecina

    Joined: 22 Dec 2002

    Posts: 10,166

    Location: Minehead

    Does the stop light come on at all/Cooling fans?
     
  6. Joe T

    Capodecina

    Joined: 1 Apr 2003

    Posts: 11,728

    Location: Northampton

    Cheers for your replies fellas. :)

    Coolant level is fine. Maybe a flush would help.

    The temp thing is pretty constantly high (over the past weeks), it always seems to be well over 90. Therefore I dont think its heavy traffic or anything similiar.

    There are no warning lights or anything like that.
     
  7. Enfield

    Soldato

    Joined: 8 Nov 2003

    Posts: 7,401

    Location: Hampshire

    Ignore this, i'm a tit.
     
    Last edited: 24 Mar 2006
  8. Bat

    Hitman

    Joined: 19 Oct 2002

    Posts: 986


    Er, 85c.
     
  9. Joe T

    Capodecina

    Joined: 1 Apr 2003

    Posts: 11,728

    Location: Northampton

    I think he means degrees not mph.

    Maybe you should read the thread :p
     
  10. Stonedofmoo

    Soldato

    Joined: 24 Oct 2002

    Posts: 6,245

    Location: Portsmouth

    Get some of that radiator flush :)
     
  11. Enfield

    Soldato

    Joined: 8 Nov 2003

    Posts: 7,401

    Location: Hampshire

    LMFAO, I am REALLY not with it ahhaha, sorry Mike. :p
     
  12. -Mike-

    Capodecina

    Joined: 22 Dec 2002

    Posts: 10,166

    Location: Minehead

    Lol!! ;) I did indeed mean degrees C, that would have been marked down :p 60 in third is pretty much all you can get :)
     
  13. Enfield

    Soldato

    Joined: 8 Nov 2003

    Posts: 7,401

    Location: Hampshire

    Aye :)

    1st: 20
    2nd: 40
    3rd: 60
    4th: 80 (can probably get more out of 4th but it's much faster shortshifting)
    5th: 110


    You could have a faulty:

    Thermostat
    Temperature Gauge

    or

    You could just be low on fluid, maybe an airlock?
     
  14. -Mike-

    Capodecina

    Joined: 22 Dec 2002

    Posts: 10,166

    Location: Minehead

    5th does more than 110!!! ;)

    To the OP - Could you do me a favour? Assuming your DT has dead locking like mine and an alarm, can you look in your drivers side fusebox and see how many relays you have at the far left? I have one missing and i'm wondering if the previous owners got sick of the alarm siren? Thanks :)
     
  15. TerryWogan

    Wise Guy

    Joined: 9 Jun 2004

    Posts: 1,813

    Location: UK

    Screw modded?

    Yes I know, someone has already cracked it, but it had to be done again.

    Someone else had best crack it once more for good measure, too. :D
     
  16. Stonedofmoo

    Soldato

    Joined: 24 Oct 2002

    Posts: 6,245

    Location: Portsmouth

    I think you'll find the screw mod doesnt apply to Phase 2's?
     
  17. digitalwolf

    Mobster

    Joined: 27 Mar 2004

    Posts: 3,575

    Location: England

    I'm thinking of getting a 306 TD.

    What is this screw mod? What is actually modded? What year of car does it apply to?
     
  18. lordrobs

    Capodecina

    Joined: 30 Sep 2003

    Posts: 14,978

    Location: Norwich

    I'm pretty sure you can. The HDi's didn't come out until phase 3.

    Basically you can up the boost and fueling simply by turning a couple of screws. It can give some good results for a free tinker but it seems a bit hit and miss for my liking.
     
  19. digitalwolf

    Mobster

    Joined: 27 Mar 2004

    Posts: 3,575

    Location: England

    So basically it makes more noise and smoke :D .

    I'm thinking of buying an 01 306 2.0 HDi (£2750) It's done 105k miles and has service history, but not full. It's well spec'd got A/C, CD Player, Front Fogs etc.

    Is it worth it? Or should I look for 1 with fsh? Can you find out if they have been filling it up with red diesil?
     
  20. Enfield

    Soldato

    Joined: 8 Nov 2003

    Posts: 7,401

    Location: Hampshire

    The boost compensator screw makes the most difference I found. It puts more fuel in before the turbo cuts in so when it does cut in it doesn't feel like it's turboed. I'm not sure if it provides more fuel when the turbo spooled up or not though.

    I adjusted the boost too by shortening the wastegate arm? I think it actually made it slower though since I didnt want to mess about with the fuel pump screw thingy.