Resultat 1 till 6 av 6
  1. #1
    mickegus
    Gäst

    Låg tomgång vid kall motor

    Hej,
    Har en Scirocco GTI -79 med K-Jetronic. Har alltid haft problem med låg tomgång när motorn är kall. Är det styrtrycksventilen som strular? Har bytt med 2 stycken från skroten men de vet jag ju inte om de funkar. Har någon mätt system och styrtryck nångång? Kan man köpa prylar för det utan att ruinera sig någonstans.

    Tack på förhand.

  2. #2
    Hedersmedlem
    Moderator
    Mannys avatar
    Reg.datum
    maj 2007
    Namn
    Thor Gustafsson
    Medlemsnr
    4407
    Ort
    Hässlehåla
    Inlägg
    6 014
    hur är det när den är varm då?
    VWCS - Volkswagen Club Sweden
    www.manny.se

  3. #3
    mickegus
    Gäst
    då går den bra.

  4. #4
    Hedersmedlem
    Moderator
    Mannys avatar
    Reg.datum
    maj 2007
    Namn
    Thor Gustafsson
    Medlemsnr
    4407
    Ort
    Hässlehåla
    Inlägg
    6 014
    Kasnke är av intresse:

    K-Jetronic: Troubleshooting Symptoms
    K-Jetronic is a mechanical system: the fuel is continuously metered in proportion to the quantity of air drawn in by the engine. The K-Jetronic system was installed as Original Equipment in series production vehicles in the years 1973 through 1995. Since then, the K-Jetronic system has been only of significance for repairs and maintenance.

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    Symptom: Engine does not start/starts hard when cold

    Sensor plate and/or plunger not moving freely - Check for free movement
    Auxiliary air valve does not open - Check valve for correct function
    Electric fuel pump not operating - Check pump fuse, pump relay and pump
    Cold start system defective - Check cold start system
    Therm-time switch defective - Test thermo-time switch
    "Cold" control pressure outside tolerance - Test pressure
    Injector leaking, opening pressure low - Check injectors on tester
    Injected fuel quantities unequal - Check for equal fuel quantities
    Basic idle setting incorrect - Check and adjust CO level

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    Symptom: Engine does not start/starts hard when warm

    Leaks in air intake system (false air) - Check air system for leaks
    Sensor plate and/or plunger not moving freely - Check for free movement
    Air flow sensor plate stop incorrectly set - Check and reset
    Electric fuel pump not operating - Check pump fuse, pump relay and pump
    "Warm" control pressure too high - Test pressure
    Fuel system leakage - Inspect fuel system for leaks
    Injector leaking, opening pressure low - Check injectors on tester
    Injected fuel quantities unequal - Check for equal fuel quantities

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    Symptom: Irregular idle during warm-up

    Leaks in air intake system (false air) - Check air system for leaks
    Auxiliary air valve does not open - Check valve for correct function
    Cold start valve leaking - Check cold start valve
    "Cold" control pressure outside tolerance - Test pressure
    Injector leaking, opening pressure low - Check injectors on tester
    Injected fuel quantities unequal - Check for equal fuel quantities
    Basic idle setting incorrect - Check and adjust CO level
    Lambda control system not functioning correctly - Check Lambda control system

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    Symptom: Irregular idle with warm engine

    Leaks in air intake system (false air) - Check air system for leaks
    Sensor plate and/or plunger not moving freely - Check for free movement
    Cold start valve leaking - Check cold start valve
    "Warm" control pressure too high - Test pressure
    "Warm" control pressure too low - Test pressure
    Injector leaking, opening pressure low - Check injectors on tester
    Injected fuel quantities unequal - Check for equal fuel quantities
    Basic idle setting incorrect - Check and adjust CO level
    Lambda control system not functioning correctly - Check Lambda control system

    --------------------------------------------------------------------------

    Symptom: Engine will not accelerate, backfires

    Leaks in air intake system (false air) - Check air system for leaks
    Sensor plate and/or plunger not moving freely - Check for free movement
    "Warm" control pressure too high - Test pressure
    "Warm" control pressure too low - Test pressure
    Basic idle setting incorrect - Check and adjust CO level
    Lambda control system not functioning correctly Check Lambda control system

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    Symptom: Engine backfires under load

    Sensor plate and/or plunger not moving freely - Check for free movement
    Electric fuel pump not operating - Check pump fuse, pump relay and pump
    "Warm" control pressure too high - Test pressure
    Primary system pressure out of tolerance - Test pressure and adjust with shim
    Injector leaking, opening pressure low - Check injectors on tester

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    Symptom: Poor Performance

    Leaks in air intake system (false air) - Check air system for leaks
    Sensor plate and/or plunger not moving freely - Check for free movement
    "Warm" control pressure too high - Test pressure
    "Warm" control pressure too low - Test pressure
    Primary system pressure out of tolerance - Test pressure and adjust with shim
    Injected fuel quantities unequal - Check for equal fuel quantities
    Throttle butterfly does not open completely - Check butterfly and stops in throttle venturi
    Lambda control system not functioning correctly - Check Lambda control
    system

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    Symptom: Engine runs on

    Sensor plate and/or plunger not moving freely - Check for free movement
    Air flow sensor plate stop incorrectly set - Check and reset
    Cold start valve leaking - Check cold start valve
    Injector leaking, opening pressure low - Check injectors on tester
    Basic idle setting incorrect - Check and adjust CO level

    --------------------------------------------------------------------------

    Symptom: Fuel consumption too high

    Cold start valve leaking - Check cold start valve
    "Warm" control pressure too low - Test pressure
    Basic idle setting incorrect - Check and adjust CO level
    Lambda control system not functioning correctly - Check Lambda control system

    --------------------------------------------------------------------------

    Symptom: Driving performance unsatisfactory

    Leaks in air intake system (false air) - Check air system for leaks
    Sensor plate and/or plunger not moving freely - Check for free movement
    Excessive fuel delivery to control circuit - Check fuel delivery
    "Warm" control pressure too high - Test pressure
    "Warm" control pressure too low - Test pressure
    Primary system pressure out of tolerance - Test pressure and adjust with shim
    Basic idle setting incorrect - Check and adjust CO level
    Lambda control system not functioning correctly - Check Lambda control system

    --------------------------------------------------------------------------

    Symptom: CO concentration at idle too high

    Sensor plate and/or plunger not moving freely - Check for free movement
    Cold start valve leaking - Check cold start valve
    "Warm" control pressure too high - Test pressure
    Basic idle setting incorrect - Check and adjust CO level
    Lambda control system not functioning correctly - Check Lambda control system

    --------------------------------------------------------------------------

    Symptom: CO concentration at idle too low

    Leaks in air intake system (false air) - Check air system for leaks
    Sensor plate and/or plunger not moving freely - Check for free movement
    Basic idle setting incorrect - Check and adjust CO level
    Lambda control system not functioning correctly - Check Lambda control system

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    Symptom: Idle speed cannot be adjusted (too high)

    Auxiliary air valve does not close - Check valve for correction function

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    Symptom: Engine starts but immediately dies

    Electric fuel pump not operating - Check pump fuse, pump relay and pump
    Excessive fuel delivery to control circuit - Check fuel delivery
    "Warm" control pressure too high - Test pressure
    "Warm" control pressure too low - Test pressure
    Primary system pressure out of tolerance - Test pressure and adjust with shims
    VWCS - Volkswagen Club Sweden
    www.manny.se

  5. #5
    mickegus
    Gäst
    Tackar, tackar. Jag har sparat undan det citatet för framtida referens. Jag har kollat allt som står i listan för låg tomgång och det enda som jag inte har gjort är att kontrollera system och styrtryck. Har du något tips om hur man gör det?

  6. #6
    mickegus
    Gäst
    Jag skaffade en ny varmkörningregulator på skroten som jag monterade idag och nu har jag tomgång när motorn är kall. Ville bara nämna detta för andra som har liknande problem.

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