Misfire caused by a misadjusted crank sensor (rubbing on flywheel)

Описание: Here, we’re diagnosing an intermittent misfire symptom, caused by an excessive crankshaft position sensor air gap. “Trash in, trash out” is how the saying goes, and this video is a perfect example. I’m also demonstrating the power of a lab scope, and the importance of verifying signal inputs before replacing parts.

Engine Performance Diagnostics chapter 21 page 20

Symptoms
intermittent misfire
no codes present

Fix
adjust crankshaft position sensor air gap

Tests shown
using an in-line spark tester to check for an ignition system issue
checking an ignition coil primary current waveform with a lab scope and low amp probe
checking camshaft and crankshaft position sensor waveforms for faults
checking an ignition coil control signal (transistor external of the PCM)
manually checking a crankshaft position sensor air gap

Tools used
in-line spark tester
Picoscope automotive 4 channel lab scope
inductive low amp probe

Playlist
(Chapter 21) Ignition inputs, cam and crank sensor
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.