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Servicing Motronic injection system
Technical data
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Engine code letters
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BBK 4.2 L 253 KW (344 HP)
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Idling speed 1)
Speed cannot be adjusted; regulated by idling speed stabilisation
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640 ... 720 rpm
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Speed governing
by closing throttle valve
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7000 rpm
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Fuel pressure at idling speed
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Vacuum hose connected
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approx. 3.5 bar
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Vacuum hose
disconnected
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approx. 4.0 bar
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Holding pressure after 10 minutes
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min. 2.5 bar
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Injectors
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Spray pattern
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Multi-hole nozzle/same for all injectors
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Injection quantity
(30 seconds)
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105...125 ml
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Resistance
(ambient temperature at 20 °C) 2)
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13 ... 16 ω
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1) Current values:
=> Exhaust emission test binder
2) With warm engine, injector resistance increases by approx. 4...6 ω.
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