In most cases, when I guess or even take an educated guess, I pay the price. Even though my educated guess comes with 24 years of hands on experience it is wrong nearly 50% of the time. This means I have just increased my diagnosis time, and wound up replacing a part that was not required.

This brings me back to the proper troubleshooting of car problems. Get a good auto repair manual and perform all the step-by-step diagnosis that the troubleshooting manual provides. When you feel like you have found the problem take the extra step and test the individual component.

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