Visa fullständig version : Låg tomgång vid kall motor
mickegus
2008-08-04, 22:52
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.
hur är det när den är varm då?
mickegus
2008-08-04, 23:18
då går den bra.
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
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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
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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
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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
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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
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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
mickegus
2008-08-05, 09:51
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?
mickegus
2008-08-14, 21:08
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.