This month's winning tip reminds us that temperature matters
"Sometimes a hot 'no start' can be caused by a failure in the crankshaft position sensor (CKP) and not set any related trouble codes in the engine control module. The car will start and run fine after the sensor cools. I check the sensor by removing it from the car, attaching my ohmmeter and then heating it up with a heat gun while watching the meter. If the sensor is bad, resistance will rise and possibly even go 'open.'"This tip applies not only to CKP sensors, but to any electrical winding on the car like camshaft position sensors (CMP), EVAP purge valves and fuel injectors. You can test the latter by this method, or by activating them repeatedly with a scan tool or multimeter. Information on using your multimeter as a bi-directional control is available online in the AutoPro Workshop.
Avoiding Stripping Plugs
When replacing a set of ignition wires, I like to save the spark plug end boot from a few of the old wires. The longer ones work the best. When replacing the plugs in vehicles with hard to reach or recessed plugs, simply insert the new spark plug into the boot and turn in by hand. This works well even on tight angles, since the boots will allow for flexing around the corners. Torque the plug to spec to finish the installation.
Dave Stierle, New Jersey
One good way to locate a shorted wire is to get a manual compass and trace the harness with it. Current flow creates its own magnetic field and the compass needle will spin erratically near the area of the short.
Jesus Reyes, Texas