Hey All,

I've got a Suzuki XL7 that is suffering misfire on Bank 2. I figured it was probably due diligence to check the cam/crank correlation on that bank since these engines are notorious for these issues. I found a 2007 XL7 known good on this forum and use it as a baseline ([2007 Suzuki XL-7, Engine/Propulsion Waveform]). I saved a modified copy of this waveform below with some reference markers drawn in for easier comparison. Seems to me like its okay, but I'm interested in some opinions.

In the 2008_under_test.png

blue - intake cam

purple - exhaust cam

yellow - crank sense

green - cylinder 2 ignition pulse

Comparing the two waveforms the exhaust seems to be spot on with 5 pulses of the crank matching up with the falling edge of the cam. However looking at the intake it appears that there is a slight variance. Looking at the pulse train between the rising edge and the falling edge of the intake it seems like the falling edge of the known good lines up with a falling edge of a crank pulse, where as the under test is delayed by 0.50ms and lines up with the rising edge of the next pulse. Is this variance enough that I should be worried about the timing? Check out the diagram below.

[2008 Suzuki XL-7, Engine/Propulsion Waveform] [2007 Suzuki XL-7, Engine/Propulsion Waveform]

Thanks, Alan Huang

Alan Huang
Engineer
Synopsys
Hillsboro, Oregon, USA

Files Referenced: