I had intermittent cylinder-specific misfire caused by intermittent low compression due to a bent rod.
Relative compression waveform looked perfect for a random amount of crank revolutions and intermittently would appear low on my misfiring cylinder.
A compression test never showed the low compression and a leak down test did not reveal the problem. I had to crank up the pressure during the leak down which actually gave me direction.
Have you guys seen this before? Without the ability of a scope I’m not sure I would’ve found the problem.
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
I ran in to this one a Kia Soul with a 1.6L GDI. The cylinder walls were scratched just below the compression line. So it passed leak down test perfectly.
The following user(s) said Thank You: Noah, Dtech494
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