Good Day
Ran into this today diagnosing a miss on a 2003 Hyundai Elantra 2.0L. VIN: KMHDM45D63U670492. Vehicle had a noticeable missfire on number 3 which it reported as P0303. The bidirectional test to disable the injectors suggested that the miss was actually on number 2 since when that injector was being disabled by the scanner there was no change in idle quality. Disabling 3 made the missfire worse. Scoping the injector waveform showed when number 2 was being disabled the scanner actually was disabling injector 3. Problem turned out to be a vacuum leak on the intake port which affected that cylinder more than the other three. https://www.youtube.com/watch?v=65t7If_MDb0 is a video i took showing the problem.
Ran into this today diagnosing a miss on a 2003 Hyundai Elantra 2.0L. VIN: KMHDM45D63U670492. Vehicle had a noticeable missfire on number 3 which it reported as P0303. The bidirectional test to disable the injectors suggested that the miss was actually on number 2 since when that injector was being disabled by the scanner there was no change in idle quality. Disabling 3 made the missfire worse. Scoping the injector waveform showed when number 2 was being disabled the scanner actually was disabling injector 3. Problem turned out to be a vacuum leak on the intake port which affected that cylinder more than the other three. https://www.youtube.com/watch?v=65t7If_MDb0 is a video i took showing the problem.
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