Can the QCSC DAS SYSTEM find a bad Ford pickup? YES

Why is the spout so erratic? Why do the evenly spaced gridmarks clearly show that the ignition module failed to pulse the ignition coil? Can it be bad PIP dwell or duty-cycle?

EXPLANATION OF WAVEFORM: The top channel is PIP, the second channel is SPOUT, the third channel is #1 spark plug ID, and the bottom channel is the ignition coil negative. First we put up 8 evenly spaced gridmarks, starting at the rising edge of the first skinny signature PIP and ending at the rising edge of the second skinny signature PIP. On a Ford SEFI, a skinny signature PIP is a quick clue to the need for a pickup. But we analyze it anyway and find that the signature PIP has a low-time dutycycle of 82%, this is too long!

In case your wondering, the RPM of 854 for an 8 cylinder is derived from the PIP signal. The picture was also zoomed to show just one full cycle, and the coil negative was scaled up to show that the coil firings line up with the rising edge of SPOUT.

Waveforms Courtesy of:
CHARLIE'S CAR CLINIC, Lodi, NJ -- 973-546-2726 -- fixitwyte@aol.com

See a normal PIP and AUTOMATIC WAVEFORM ANALYSIS

For more info, call: Quad Computer Systems Consultants, 973-472-0328, ASK FOR DAN

EMAIL to; qcscdas@aol.com or EMAIL to; lody@delphi.com
Please entitle email inquiries -- QCSC DAS
VISIT; QCSC at Delphi or VISIT; QCSC at AOL

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QCSC DAS Copyright 1997 -- Developed by; Daniel A. Buckley (NIASE GAM)

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