DS23 ie fuel mix
  • Register
  • Help
Results 1 to 15 of 15
  1. #1
    Fellow Frogger! IE23's Avatar
    Join Date
    Jan 2011
    Location
    Melbourne
    Posts
    749

    Default DS23 ie fuel mix

    How do I adjust the fuel mix? I believe it is running lean.
    I know about the ECU adjustment but is there another adjustment possible on the intake manifold? I'm looking at the screw adjuster but this is for idle revs only?

    Advertisement


    Adrian

    _________________

    Current;

    Xantia V6 Exclusive Auto 2000


    Past;

    CX25 GTI Turbo series 1 1985
    DS23 IE Pallas 5sp 1974
    CX25ie Pallas Auto 1984 Parts
    2CV 1988
    CX25ie Pallas Auto 1984

  2. #2
    Member Mitchell's Avatar
    Join Date
    Mar 2004
    Location
    Perth
    Posts
    97

    Default

    The potentiometer on the ECU will adjust mixture - at idle only (when activated by contacts in the throttle switch).

    The coolant temp switch (T2) is critical in providing inputs to the ECU, that will impact on mixture. Worth changing just to be sure. These are the same as on any Djet water cooled car.

    One work-around is disconnecting the ambient air sensor (T1). This will richen the mixture by around 20%

    After the simple things, the likely candidate for mixture abnormalities is the MAP sensor (or pressure sensor).


    Regards,
    Rhys

  3. #3
    Real cars have hydraulics DoubleChevron's Avatar
    Join Date
    May 2000
    Location
    Ballarat,Vic,Aust.
    Posts
    16,323

    Default

    low fuel pressure could cause issues, I can't remember if we can check the manifold pressure sensor with Djet. Oh, if you check TS2 as suggested (the most important check), drop down the ECU and do it at it's plug. This was you are testing the wiring to the sender as well.

    seeya,
    Shane L.
    'Cit' homepage:
    Citroen Workshop
    Proper cars--
    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/citro%EBn-forum/90325-best-project-car-you-have-ever-seen.html
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual

  4. #4
    1000+ Posts pottsy's Avatar
    Join Date
    Sep 2002
    Location
    Melbourne, Northern Suburbs
    Posts
    1,016

    Default

    When I was the proud owner of a DS23 ie I created a fuel pressure gauge out of an oil pressure gauge, a t-piece and a bit of tubing.

    I fitted it on the fuel line leading up to the cold start injector and was surprised to find that my car was in fact running a bit lean. By bringing it up to the nominal figure the running improved immensely.

    From memory the optimum fuel pressure is 28psi, and the fuel pressure regulator is adjustable so one can achieve this. By adjusting the fuel pressure you are effectively changing the "float level" to create an analogy with carbies, if that makes it easier to understand?

    The potentiometer control on the "ECU" is only a fine adjustment of the idle mixture. Like all idle mix adjustments it has little or no effect when the throttle is open more than a bit.

    Hope this helps, Pottsy.
    Buvito Ergo Sum!

    The Fleet:

    2018 C3 Shine ("Oscar" Mrs P's)
    1974 D Special Manual Sedan ("Moby Dick")
    2006 C5 HDI Wagon Auto ("Mephistopheles")
    1982 2CV6 ("Gaston") On the road! (Woohoo!)
    1957 Slough 2CV ("Alphonse") Waiting in the wings
    1975 GS Pallas ("GiSelle") Also waiting in the wings
    And for Fun, 1968 Mini Deluxe ("The R & D'luxe" 1078cc, Grin Factor 100!)

  5. #5
    Fellow Frogger! IE23's Avatar
    Join Date
    Jan 2011
    Location
    Melbourne
    Posts
    749

    Default

    This feed back is marvellous!
    i removed the TS1 sensor and instant improvement. I have also added octane booster to my fuel which I suspect has become stale plus topped up with 98. Doing this has eliminated the pinging.

    where is the TS2 located?
    how do I adjust the pressure regulator?


    Adrian

    _________________

    Current;

    Xantia V6 Exclusive Auto 2000


    Past;

    CX25 GTI Turbo series 1 1985
    DS23 IE Pallas 5sp 1974
    CX25ie Pallas Auto 1984 Parts
    2CV 1988
    CX25ie Pallas Auto 1984

  6. #6
    Fellow Frogger! IE23's Avatar
    Join Date
    Jan 2011
    Location
    Melbourne
    Posts
    749

    Default

    The pressure regulator is sealed. I replaced this with a NOS recently. So my next step is TS2, once you tell me where it is.


    Adrian

    _________________

    Current;

    Xantia V6 Exclusive Auto 2000


    Past;

    CX25 GTI Turbo series 1 1985
    DS23 IE Pallas 5sp 1974
    CX25ie Pallas Auto 1984 Parts
    2CV 1988
    CX25ie Pallas Auto 1984

  7. #7
    1000+ Posts Ken W's Avatar
    Join Date
    Sep 2002
    Location
    North Brisbane
    Posts
    1,892

    Default

    Does disconnecting the air temp sensor also increase the richness of the mixture at idle speed?

  8. #8
    1000+ Posts pottsy's Avatar
    Join Date
    Sep 2002
    Location
    Melbourne, Northern Suburbs
    Posts
    1,016

    Default

    Quote Originally Posted by IE23 View Post
    The pressure regulator is sealed. I replaced this with a NOS recently. So my next step is TS2, once you tell me where it is.
    Interesting. I thought all the injected D's had the adjustable unit. Ah well, you can still measure it with a gauge anyway, just not do anything about it!

    Cheers, Pottsy
    Buvito Ergo Sum!

    The Fleet:

    2018 C3 Shine ("Oscar" Mrs P's)
    1974 D Special Manual Sedan ("Moby Dick")
    2006 C5 HDI Wagon Auto ("Mephistopheles")
    1982 2CV6 ("Gaston") On the road! (Woohoo!)
    1957 Slough 2CV ("Alphonse") Waiting in the wings
    1975 GS Pallas ("GiSelle") Also waiting in the wings
    And for Fun, 1968 Mini Deluxe ("The R & D'luxe" 1078cc, Grin Factor 100!)

  9. #9
    Member Mitchell's Avatar
    Join Date
    Mar 2004
    Location
    Perth
    Posts
    97

    Default

    Citroen D-jets utilise a type 1 manifold sensor (the simplest kind), they are adjustable via a slotted screw, after the epoxy potting is removed. Very sensitive and best left alone if you don't know what you are doing. Buying a NOS unit was a great move. Buying any NOS D-jet components for future use, would be good too.

    I've never had a I.E. D, so don't know where T2 lives. Can't be hard to find it...looks similar to T1 with the same electrical connector - mounted in a water jacket somewhere. Last one I got was $44 + GST (trade)

    Regards,
    Rhys

  10. #10
    Fellow Frogger! IE23's Avatar
    Join Date
    Jan 2011
    Location
    Melbourne
    Posts
    749

    Default

    Found the TS2 location. Ordered a NOS replacement from eBay.


    Adrian

    _________________

    Current;

    Xantia V6 Exclusive Auto 2000


    Past;

    CX25 GTI Turbo series 1 1985
    DS23 IE Pallas 5sp 1974
    CX25ie Pallas Auto 1984 Parts
    2CV 1988
    CX25ie Pallas Auto 1984

  11. #11
    Fellow Frogger!
    Join Date
    Nov 2010
    Location
    Kapunda
    Posts
    449

    Default

    Hi Adrian,I too have never seen a non adjustable Fuel Pressure Regulator.The temp sensor(not switch) at the front inlet side of the head can be easily checked with an ohmmeter.I have a facility for checking the MAP sensor.
    Woody

  12. #12
    1000+ Posts Ken W's Avatar
    Join Date
    Sep 2002
    Location
    North Brisbane
    Posts
    1,892

    Default

    Woody,

    How are you checking the MAP sensor?

    Cheers, Ken

  13. #13
    Fellow Frogger!
    Join Date
    Nov 2010
    Location
    Kapunda
    Posts
    449

    Default

    Hi Ken I have a complete EFI system wired up on the Bench with an electronic box to simulate the Dissy plus a hand vacuum pump for Manifold pressure.This way I can check injector pulse widths through the whole operating range So I can check any component.W hile I dont have any official figures ,I use the average results from components that I know work well.
    Woody

  14. #14
    Real cars have hydraulics DoubleChevron's Avatar
    Join Date
    May 2000
    Location
    Ballarat,Vic,Aust.
    Posts
    16,323

    Default

    There is one temperature sender just behind the water pump (from memory) the other is on the air cleaner. I've read in the past unplugging the air cleaner temp sender will make the mixture slightly richer.

    I'd whip the calculator out and replace the capacitors too. Mine wouldn't run when I got it due to dead capacitors in the calculator. It's an easy repair as it is all standard electronic components available from ebay/electronics stores

    I can't find the pdf of the Djet manual, but here is the html version:

    http://shanescitshed.com/ds21fuelinj/index.html

    seeya,
    Shane L.
    'Cit' homepage:
    Citroen Workshop
    Proper cars--
    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/showthread.php?t=90325
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual

  15. #15
    Fellow Frogger! IE23's Avatar
    Join Date
    Jan 2011
    Location
    Melbourne
    Posts
    749

    Default

    thanks Shane, I have this in PDF and was reading it further yesterday.

    Interestingly with the air temp sensor removed the engine performs nicely. Fortunately I have two ECU's and so far they both perform the same. One was tested a few years ago. Anyway I have more investigating to do to resolve the cause.


    Adrian

    _________________

    Current;

    Xantia V6 Exclusive Auto 2000


    Past;

    CX25 GTI Turbo series 1 1985
    DS23 IE Pallas 5sp 1974
    CX25ie Pallas Auto 1984 Parts
    2CV 1988
    CX25ie Pallas Auto 1984

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •