Mechanics

ENGINE SPUTTER PASSING 4K RPM'S

1994 Mercedes Benz E420 • 185,000 miles

Starts to sputter after passing 4000 RPM’s on the tachometer.
Note: The upper wire harness was replaced due to faulty wires.
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Hurman
August 3, 2011.



http://www.2carpros.com/articles/engine-hesitates

Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.

Rasmataz
Sep 12, 2011.


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