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Mk3 103tsi consumption at tickover

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  • #1

    Mk3 103tsi consumption at tickover

    I would like confirmation from other 1.4tsi users of the instant fuel consumption read-out for the tickover when you first start your car from cold.
    My car shows 2.4 to 2.6 l/hour. That is with an ambient temperature of 26 deg C, no lights, fans or a/c on.

    After only a kilometre of driving the tickover consumption has dropped to 0.7 to 0.8 l/hour and shortly after that it will read the normal 0.4 to 0.5 l/hour.
    I don't really need that secondary info confirmed but thought it might interest others as to how quickly it warms up.

    I am trying to determine if the cold start consumption is normal as this phase is when I experience in-gear low rev/speed hesitation and poor throttle response.

    Thanks

    Gerry
    Tags: car, consumption, l/hour, start, tickover
  • #2
    Yes, it's normal.

    The ECU will run the car far richer than normal (keep throttle plate more closed, inject more fuel) when cold to drive against the thicker oil. It will not produce anywhere near optimal power delivery in this mode hence the poor driving characteristics.

    With carbys, this was done via the choke (basically another throttle plate upstream of the normal one and jets)
    Resident grumpy old fart
    VW - Metallic Paint, Radial Tyres, Laminated Windscreen, Electric Windows, VW Alloy Wheels, Variable Geometry Exhaust Driven Supercharger, Direct Unit Fuel Injection, Adiabatic Ignition, MacPherson Struts front, Torsion Beam rear, Coil Springs, Hydraulic Dampers, Front Anti-Roll Bar, Disc Brakes, Bosch ECU, ABS

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    • #3
      I know that more fuel is required for the cold start process but I am trying to compare the actual amount required for a car that is not experiencing cold start driving issues that I am.
      My car is less than a year old and it did not have these problems for the first 2k so there is something wrong and I want it fixed.
      I have already left it with the dealers and got the usual and totally unsatisfactory "it's normal" response.
      I need facts to ascertain if my readings are relatively rich or lean, or even normal for this phase.

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      • #4
        It's probably worth your while to ask about the experience of 90tsi Golf owners. The fuel mapping would be very similar.
        carandimage The place where Off-Topic is On-Topic
        I used to think I was anal-retentive until I started getting involved in car forums

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        • #5
          Originally posted by Gerrycan View Post
          I know that more fuel is required for the cold start process but I am trying to compare the actual amount required for a car that is not experiencing cold start driving issues that I am.
          My car is less than a year old and it did not have these problems for the first 2k so there is something wrong and I want it fixed.
          I have already left it with the dealers and got the usual and totally unsatisfactory "it's normal" response.
          I need facts to ascertain if my readings are relatively rich or lean, or even normal for this phase.
          Does yours have the mode button Gerry? Does it do it in all modes?
          2014 Skoda Ambition Plus 103TSI candy white wagon, 6sp Manual, Tech pack, Panoramic Sunroof, 18's, Colour Maxidot, Comfort BT
          Ordered 07 May 14 (Wk 15), Built Wk 37, Loaded 27/9 (wk 39), Docked 12/11 (wk 46), DELIVERED! 12/12 (end of wk 50 - 7 months + 1 week).

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          • #6
            Mine goes up to 3.7l/hour on a cold start.

            I've sent you a PM with a video, Gerry.

            Comment

            • #7
              Originally posted by GTR27 View Post
              Does yours have the mode button Gerry? Does it do it in all modes?
              Lol, it's an Ambition, it only has one mode.

              Comment

              • #8
                Originally posted by brenno View Post
                Mine goes up to 3.7l/hour on a cold start.

                I've sent you a PM with a video, Gerry.
                Well that was interesting!
                I did what Brenno did in his video he sent to me and started the engine and just let it idle until more normal tickover rpm and consumption figures (this time went from 4.4 l/hour down to around 0.7 to 0.9 l/hour). It took about 45 seconds.
                Then I pulled out the garage into the drive and did my usual 1st gear crawl to the end of the driveway AND I DID NOT EXPERIENCE THE HESITATION and throttle response seemed normal.

                I never idle after starting, I just start and go. Of course I got told off by my Eco-tips display about unnecessary idling affecting fuel consumption when I did it.

                I must be confusing the ECU? more experimentation required, but I can only do it once a day on the first cold start.

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                • #9
                  Originally posted by Gerrycan View Post
                  Lol, it's an Ambition, it only has one mode.
                  I just took a vid of stone cold start of ours. Im currently uploading it to youtube.

                  TLDR; 3.1 L/hr on initial start, then drops to 2.7-2.8, then down to ~2L/hr very quickly. I shut it off after that. 27.5 deg ambient (according to car)

                  YouTube

                  EDIT: The mode button is a wank anyway, ours stays in normal all the time. I just have steering in "sport" for a bit more weight to it
                  Last edited by GTR27; 18-02-2015, 12:59 PM.
                  2014 Skoda Ambition Plus 103TSI candy white wagon, 6sp Manual, Tech pack, Panoramic Sunroof, 18's, Colour Maxidot, Comfort BT
                  Ordered 07 May 14 (Wk 15), Built Wk 37, Loaded 27/9 (wk 39), Docked 12/11 (wk 46), DELIVERED! 12/12 (end of wk 50 - 7 months + 1 week).

                  Comment

                  • #10
                    Originally posted by brad View Post
                    It's probably worth your while to ask about the experience of 90tsi Golf owners. The fuel mapping would be very similar.
                    Agree, but I did not need that many responses just a couple to compare.

                    Brenno has come up with 'beyond the call of duty response' that has lead to an interesting discovery for me.

                    Comment

                    • #11
                      Originally posted by Gerrycan View Post
                      I know that more fuel is required for the cold start process but I am trying to compare the actual amount required for a car that is not experiencing cold start driving issues that I am.
                      My car is less than a year old and it did not have these problems for the first 2k so there is something wrong and I want it fixed.
                      I have already left it with the dealers and got the usual and totally unsatisfactory "it's normal" response.
                      I need facts to ascertain if my readings are relatively rich or lean, or even normal for this phase.
                      OK, this additional information puts a different spin on your initial enquiry. The MkVII Golf forum may provide more feedback for this engine
                      Resident grumpy old fart
                      VW - Metallic Paint, Radial Tyres, Laminated Windscreen, Electric Windows, VW Alloy Wheels, Variable Geometry Exhaust Driven Supercharger, Direct Unit Fuel Injection, Adiabatic Ignition, MacPherson Struts front, Torsion Beam rear, Coil Springs, Hydraulic Dampers, Front Anti-Roll Bar, Disc Brakes, Bosch ECU, ABS

                      Comment

                      • #12
                        Originally posted by GTR27 View Post
                        I just took a vid of stone cold start of ours. Im currently uploading it to youtube.

                        TLDR; 3.1 L/hr on initial start, then drops to 2.7-2.8, then down to ~2L/hr very quickly. I shut it off after that. 27.5 deg ambient (according to car)

                        I'll edit with link when it's done

                        EDIT: The mode button is a wank anyway, ours stays in normal all the time. I just have steering in "sport" for a bit more weight to it
                        Thanks, the warm-up behaviour seems common across our type. I imagine colder weather just lengthens the process a bit.

                        I would like the heavier steering option as mine is a little over-light compared to what I considered perfect in the previous 1.9D Mk2. I expect the extra 100kg of diesel engine between front axles made a difference though.

                        Comment

                        • #13
                          Youtube link

                          YouTube

                          I gather that's the same as yours?
                          2014 Skoda Ambition Plus 103TSI candy white wagon, 6sp Manual, Tech pack, Panoramic Sunroof, 18's, Colour Maxidot, Comfort BT
                          Ordered 07 May 14 (Wk 15), Built Wk 37, Loaded 27/9 (wk 39), Docked 12/11 (wk 46), DELIVERED! 12/12 (end of wk 50 - 7 months + 1 week).

                          Comment

                          • #14
                            Originally posted by GTR27 View Post
                            Youtube link

                            YouTube

                            I gather that's the same as yours?
                            Tried to look but was told it was 'private'

                            Comment

                            • #15
                              How about now? Sorry, first time ive uploaded a video to youtube!
                              2014 Skoda Ambition Plus 103TSI candy white wagon, 6sp Manual, Tech pack, Panoramic Sunroof, 18's, Colour Maxidot, Comfort BT
                              Ordered 07 May 14 (Wk 15), Built Wk 37, Loaded 27/9 (wk 39), Docked 12/11 (wk 46), DELIVERED! 12/12 (end of wk 50 - 7 months + 1 week).

                              Comment

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