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2004 Chevrolet Impala, Engine/Propulsion waveform
Posted to the Waveform Library on 12/24/2009

Vacuum pattern at higher rpm. Cylinder #2 was missing at idle only and was not missing at this rpm. #2 cylinder had a stuck lifter that was preventing the intake valve from closing completely. No misfire was detectable above base idle speed.

Scott from Missouri


car Vehicle Data

2004 Chevrolet Impala 3.4L

VIN 2G1WF52E04
Engine3.4 L / 6 cyl / GAS
Trans4-speed AutomaticTransaxle (Electronic)
DeliveryFuel Injection
ConditionKnown Bad