Snap-on Diagnostic Quick Tips: PID Trigger Functions Video

Sept. 3, 2015

A how-to video on using the PID Trigger function as a "babysitter" for a road test.

A how-to video on using the PID Trigger function as a "babysitter" for a road test.

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The broken exhaust valve spring is the cause of the driveability fault. Keep in mind that a broken spring can present intermittent faults or faults that only occur under certain operating conditions. It’s important to realize that a broken spring can still allow a perfectly passing compression test (or relative compression test) but fail a running test miserably.

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Figure 1- A great first step in any driveability analysis, the relative compression test shows how all cylinders harness and squeeze their contents, relative to each other. This capture shows all cylinders performing similarly.

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