As I said, the engine is setup to electronically deal with the variation and not set a code, but that is not the problem. If the CMP Retard setting is more than about 5 degrees either way, the rotor tip is not in good alignment with the cap tower when the computer fires the coil, causing the spark to have to "reach". This is what causes early failure of the cap and rotor, IMO. My reasoning for this is the V6 does not, according to GM, need adjusted, but cap and rotor failure is high on V6s. On the 5.0 and 5.7 Vortec V8, GM requires the CMP be set at +/- 2 degrees, and also have a lower failure rate of cap and rotors. Do what you wish, but it should not cost much to check it, and your mechanic may learn something. Not all driveability issues set codes. What the CMP Retard is telling you is the difference, in degrees, between the crank sensor reporting #1 TDC and the cam sensor in the distributor reporting #1 TDC firing position. The cam sensor is the only thing that shows the computer firing position, the crank sensor shows TDC every crank revolution. I have seen the reading be over 15 degrees when "set it and forget it" like Bob suggests. On a V8, it will set a code, but a V6 will deal with it and fire #1 with the tower still 15 degrees away. Computer controls work on cold, hard facts, not voodoo as some believe.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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