Through this case study Bob Augustine brings home a true understanding of why the Diagnostic Process demonstrated in this clip is so important for both time savings and shop profitability.

We are going to do something a little different this time in the Fine Tuning department. We ran into a diagnostic case study you might be interested in. It involved a 2001 Chevrolet Impala with about 40,000 miles on it. The A/C fan and cruise control would intermittently stop working while the customer was driving. There seemed to be no rhyme or reason to the failure. The vehicle could be driven for days before the problem would occur.

We continue our investigation of engine knock sensors with a look at one and two-wire sensors. In the previous issue of Counter Point, we discussed the various causes of engine knock. Prior to the age of electronic engine control, an engine designer had a limited number of effective tools to guard against engine knock. Principle among these were combustion chamber design, the octane of the fuel used and mapping of the spark advance curve. The designer couldn’t risk the possibility of engine damage caused by knock, so it was always necessary to keep the engine well short of the point where it might begin. This assured engine longevity, but hurt performance.

Part 2: Analyzing Amperage Results When Testing Ignition Coils with a Low Amp ProbeCheck out Part 2 of Barry Gersten's Current Ramping series. This time, he covers how to analyze amperage results when testing ignition coils with a low amp probe.

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