Checking the control lever and the distribution piston K-Jetronic, KE-Motronic (VW Passat B3)

The intake air flow passes through the diffuser and deflects the flow meter flap. The flow meter flap, in turn, acts on the fuel metering piston via the control lever. The piston opens the fuel supply channels according to the need and thus determines the amount of fuel injected. If the piston does not move well, the engine starts poorly, jerks during transient processes and/or does not provide maximum speed.

Remove the air intake guide shroud.

Turn on the starter for about 10 seconds.



Lift the flow meter flap with your fingers, while the lever connected to the flap should provide the same resistance along the entire travel path.

Quickly move the flap down, no resistance should be felt, otherwise replace the air flow meter.

If the flow meter flap moves with difficulty and/or jerks only up, and moves down easily, this means that the piston is stuck. Replace the fuel metering device.

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