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Thread: Diesel Leak-Off Test vs Diagnostic Software

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    Default Diesel Leak-Off Test vs Diagnostic Software

    Bit technical this - does anyone know if doing a diesel injector leak off test is better/worse/the same as the injector reading information you would get from something like opcom or Tech 2?

    The injectors used on the CDTI seem to use a special inverted connector, so you cant just squeeze a piece of pipe over the end of the leak-off and do the test. You can buy the connectors for about £5 each, or I could get the car connected to a diagnostics machine, and that would tell me something about the condition of the injectors

    Which if any, is better? I am trying to diagnose poor-ish MPG figures BTW

    Thanks

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    Regular Member lee gsi's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 1.9 CDTi

    Year : 2005

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    What is it you want to know about the injector?

    If you have access to an oscilloscope you can see using that.
    Last edited by lee gsi; 10th October 2010 at 17:43.

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    Regular Member benny's Avatar
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    the fuel return leak off test has to be done mechanicaly ...ie you put the tester pots on each injector and do the maths the raw data from the ecu isnt acurate on the flow back fig .....

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    If injector or injectors are duff and as a result, maybe giving poor MPG.

    No oscilloscope to hand buddy!

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    Quote Originally Posted by benny View Post
    the fuel return leak off test has to be done mechanicaly ...ie you put the tester pots on each injector and do the maths the raw data from the ecu isnt acurate on the flow back fig .....
    Thanks mate. Thats what I wanted to hear - leak-off test it is then!

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    Quote Originally Posted by benny View Post
    the fuel return leak off test has to be done mechanicaly ...ie you put the tester pots on each injector and do the maths the raw data from the ecu isnt acurate on the flow back fig .....
    Just thinking abouth that answer again benny, would diagnostics be accurate on any other value (say spray pattern for example).

    I dont have a preference whihc route I go down (i.e. leak-off test or diagnostics) I just want to check the injectors as fully as possible.

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    Regular Member benny's Avatar
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    the only reall way to test is either to remove and inspect or leak off test ...leak of test is only a guide tho ...wnt tell you what is wrong just that you have a fault ..also how bad is the fuel econ ?

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    Regular Member the-wizard's Avatar
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    Vehicle : vectra-c

    Trim : sri

    Engine : cdti

    Year : 2004

    Mileage : 98,000

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    [QUOTE=snapsnap;1345882]Bit technical this - does anyone know if doing a diesel injector leak off test is better/worse/the same as the injector reading information you would get from something like opcom or Tech 2?

    The injectors used on the CDTI seem to use a special inverted connector, so you cant just squeeze a piece of pipe over the end of the leak-off and do the test. You can buy the connectors for about £5 each, or I could get the car connected to a diagnostics machine, and that would tell me something about the condition of the injectors

    Which if any, is better? I am trying to diagnose poor-ish MPG figures BTW

    Thanks[/QUOTE

    What type of mpg are you getting? to make you think there low'ish.

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    Thanks benny & wizard. Sound like a leak-off test is the way to go.

    Im getting about 42MPG at roughly 60% urban, 40% motorway BTW, this is based on many 1000's of miles driving. CDTI 120 1.9

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