306 D Turbo won't go above 90mph!

Discussion in 'Peugeot 306' started by Crag, Jul 5, 2003.

  1. Crag

    Crag Guest


    I recently bought an R-reg 306 1.9 D Turbo (no history) and am rarely
    on a motorway, but when I am it just gets to 90 - 93 mph and will no
    go any faster - WTF!

    the revs aren't going mad or anything, and the turbo works fine up to
    90mph, it's like it has a limiter or something.

    I've just bought some 10k Diesel (see www.10kdiesel.com) to decoke
    everything, assuming I can find the turbo to spray it in, but I don't
    know if it would help my problem.

    Any ideas?

    Crag, Jul 5, 2003
  2. Crag

    Cheater2k Guest

    Does it have an intercooler pipe, if so,its prob fell off.


    Kind Regards

    (ICQ#: 21743180)
    (URL: www.comingsoon.com)
    Cheater2k, Jul 5, 2003
  3. Crag

    Steve Walker Guest

    "10k Boost is dispensed as a fine spray in to the air-intake system,
    whilst the engine is running, the air flow carries it through the
    air-inlet into the combustion chamber. 10k boost then passes out of the
    open exhaust valve through the exhaust itself, decoking every surface it

    What a load of bollocks! No 'protective spray' is going to survive
    passing through the combustion cycle, and be able to 'decoke' the
    echaust system on the way out.

    It's snake oil mate - the best thing you can do is keep it serviced,
    especially change the oil often. All these teflon wonder products are
    basically fancy cans of kerosene.

    Your car should be good for 100-110, so it needs to go into a garage for
    a check-over. Likely to be fueling related, but pick a small expert
    who'll have time to look at it carefully.

    Steve Walker, Jul 5, 2003
  4. Crag

    scott Guest

    I got a petrol and believe me about 100mph is swift in a car that
    size. Been at 120mph on M1 (late at night) and you wouldnt want to go
    much faster. Gets a bit hairy!!! I think its down to the wheelbase,
    cos its short it doesnt sit that well at high speed.

    scott, Jul 6, 2003
  5. Crag

    Landmax Guest

    Could well be your injectors that are full of crap or someone's been messing
    with the turbo adjuster.

    Landmax, Jul 6, 2003
  6. Crag

    Crag Guest

    Interesting idea Neil. I have absolutely no idea what happened to my
    car in the 5 years of its life before I bought it - it was from an
    auction and didn't even come with a log book! However the gearbox
    feels a little stiff so I'd be surprised if it's new.

    Someone has also suggested a boost leak in the fuel pump (split
    diaphragm). Wish I knew more about engines!
    Crag, Jul 6, 2003
  7. Crag

    Tobias Meyer Guest

    If it was a different gearbox the revs would go up.

    Tobias Meyer, Jul 6, 2003
  8. Crag

    Shaun Guest

    There's a thin hose going from the intercooler to the fuel pump that
    basically tells the fuel pump to add extra fuel when the turbo is giving
    boost. If the pipe is split the fuel pump doesn't sense the boost pressure
    and doesn't add the extra fuel required to make full power. The diaphragm is
    inside the fuel pump. The pressure in the hose moves the diaphragm which in
    turn moves a shaft in the pump that inceases the fuelling. It is possible to
    check the diaphragm for splits etc. but it requires some disassembly of the
    pump and probably isn't a good idea if you haven't done this kind of thing

    Have a look over the fuel pump to see if any of the adjustment screws appear
    to have been tampered with. Especially any marked with yellow paint if you
    have them. It is possible that the maximum fuelling was turned down to
    reduce the smoke for an MOT. If you have the Bosch pump the important screw
    is shown here http://mysite.freeserve.com/sjp80/Power.jpg.

    Shaun, Jul 6, 2003
  9. Crag

    Crag Guest

    Just had my cam belt changed, and at the same time got the guy to
    check a couple of things.

    First the throttle cable needed adjusting. It wasn't allowing me to
    achieve full power.

    Second the intercooler manifold seal needed changing – now it can do
    110mph and is quicker overall!
    (still not as fast as I'd expect but it'll do :)
    Crag, Jul 14, 2003
  10. Crag

    Recon Guest

    110 mph on a private road I hope :)
    Recon, Jul 15, 2003
  11. Crag

    Mike Buckley Guest

    Mine runs out of puff at 110 (on my private test track) as well.
    Mike Buckley, Jul 24, 2003
  12. Crag

    Derek Tree Guest

    Get a V6. It's still accelerating at 145mph... <g>
    Derek Tree, Jul 24, 2003
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