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My K reg E series (120,000 miles) has started to splutter when warm, my garage diagnosed new ht leads but this has not cured it, they now suggest a new injection unit and injectors for £1200 or new injectors and lambda probe plus adding injector cleaner to the distribution head which "might do it" for £600 does anyone have any suggestions of a lower cost more reliable solution?
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Nick
It sounds to me as if your garage has reached the "poke and hope" stage. I suggest you look in yellow pages for a fuel injection specialist, get him to diagnose it and give you an estimate. For what it's worth, in my experience lots of people misunderstand what the Lambda probe does. It would be less confusing to call it an oxygen sensor since it is only part of what influences the Lambda value that you will see on your MOT print out.It fine tunes the fuel injector open time to allow the engine to run leaner or richer by sampling the outgoing exhaust gas and feeding the information back to the engine control unit (ECU). It has only a relatively small influence on the way the engine runs and there is usually provision in the engine engine management's design to allow the unit to be disconnected at the multiway connector (1,3 or 4 wires) near the sensor this will force the ECU into limp-home, which means it will assume a mean value and if all else is ok the engine will run quite happily. Disconnecting the sensor may bring up an engine alarm.
Best of Luck!
Don Cox.
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Had exactly the same problem on a G-Wagen. Distributor cap and rotor arm was the cause. Oil vapour leaking into the cap causing the spark to track.Cleaning the cap and rotor with carb cleaner effected temporary cure.
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