405 STI fuel
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Thread: 405 STI fuel

  1. #1
    Tadpole
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    Icon5 405 STI fuel

    I've just collected my new 1994 405 STI from the car yard and been told the mechanic mistakenly put regular unleaded in it and that it was "hesitating". There's now about 1:1 unleaded:premium unleaded in the tank but it's still rough as guts especially at idle. Does this sound like a fuel problem. (The car was behaving perfectly on test earlier in the week.)

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  2. #2
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    They certainly don't like unleaded much especially if it has been
    sitting for a while, how much fuel is in there at the moment ?

  3. #3
    Tadpole
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    Default Ok

    Maybe you show adjust the timing, drop back a couple degrees if you can.It would run better on unleaded like this. Till you put the right type of juice back in to it...........

  4. #4
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    I have had to run my 405 sri on regular 91 octane before due to lack of availability of premium, and the thing runs like sh*t, but i believe it dosent cause any damage or anything. After running that tank dry i just filled up on 98 and it was all good again.

  5. #5
    Tadpole
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    Default 405 STI fuel

    Quote Originally Posted by tcns
    They certainly don't like unleaded much especially if it has been
    sitting for a while, how much fuel is in there at the moment ?
    A full tank! But it also might be running rough because the detailer was over enthusiastic with the high pressure hose in the engine bay.

  6. #6
    Local Tyrant gibgib's Avatar
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    I had a 405 STI & it would idle/ run smoothly on any unleaded fuel but performance was assured with the premium.

    I'd say you are right in suspecting pressure hose water being a cause for the roughness.
    Pull the plug leads & use the pump part of a squirter bottle (ironing aid type)down beside the spark plugs & pump the water out!

  7. #7
    Fellow Frogger!
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    Default

    Over here in the U.K. we have 2 grades of unleaded fuel.

    95 RON is the normal stuff & today is selling at 79.9 pence a litre.

    98 RON is the all signing & all dancing performance brew that goes for around 84.9 pence a litre.

    I always use the 95 RON, I have tried a few tank fulls of the 98 RON & I didnt get any more performance out of my 405, It just drank it very quickly!

    My 405 has the XU10J2 engine & was built after June 1995, So it has the later cylinder head & upgraded ECU fitted.

    A fully empty 405s 70 litre tank would take 55.93 to fill in the U.K. & that = $144.35 down under at todays exchange rate.

  8. #8
    pur-john, not pew-john! peujohn's Avatar
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    Quote Originally Posted by LeePower

    A fully empty 405s 70 litre tank...
    "fully empty"?

    As in "fully sik bro"??

    John W

    1979 Peugeot 504 GTI 2.2 litre 5 speed - 72 kW at the wheels

    1974 Peugeot 504 TI
    - now on the road

    2009 Peugeot 407 HDI wagon - family car

    Previous: 2005 407 HDI manual sedan, 1980 504 GL, 1990 405 Mi16, 1977 504 GL Special, 1984 505 SRD Turbo



  9. #9
    Fellow Frogger! Decca's Avatar
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    Geoff is this a series 2 405?

    my 1995 series 2 runs ok on both ULP and PULP but it is a much better engine on the PULP. on ULP I find the engine ECU light comes on more because I think the ECU is working at its limits trying to get good performance.
    The engine is also not as tractable and will rattle when you catch the engine in the wrong gear.
    I went from Canberra to Brissy on PULP, recorded everything. then travelled back to canberra on ULP. the result was about an extra 3mpg on PULP. which works out about the same for fuel costs when the extra mileage is considered. Plus the car is much nicer to drive on the PULP

    Decca
    Present --2016 2008 Outdoor / 2014 RAV4 Diesel (My utilitarian beast)

    Past -- 19?? 403 / 1974 504GL / 1972 R12TL / 1995 405SRi / 1997 406ST / 1998 306XT / 2004 406HD1 / 2008 308XSE HDi / 2008 307XSE

  10. #10
    1000+ Posts PeterT's Avatar
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    Quote Originally Posted by Decca
    Geoff is this a series 2 405?

    my 1995 series 2 runs ok on both ULP and PULP but it is a much better engine on the PULP. on ULP I find the engine ECU light comes on more because I think the ECU is working at its limits trying to get good performance.
    The engine is also not as tractable and will rattle when you catch the engine in the wrong gear.
    I went from Canberra to Brissy on PULP, recorded everything. then travelled back to canberra on ULP. the result was about an extra 3mpg on PULP. which works out about the same for fuel costs when the extra mileage is considered. Plus the car is much nicer to drive on the PULP

    Decca
    If it's a series 2 405, then it's definitely 95 ron minimum. It has 10.4:1 compression and will ping badly under load.

    '92 205 Mi16
    '90 Mi16x4

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