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Rotor and Cap very worn! 850

posted by  Erwin on  Tue Aug 5 07:15 CST 2003
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last visit: Thu Oct 23 10:39 CST 2014
[RELATED]

Mine looked like yours. I changed rotor, cap & plugs and the car ran noticeably better.

As far as timing, I wondered this myself and here's what I figured. Looking at the rotor and cap, the contacts are about 1/8" wide if I recall. While the distributor may be locked in one position (I think it is) the camshaft driving the rotor is rotating at 1/2 crankshaft speed. Without figuring out all over again what the rotor and cap contact width would corespond to in terms of camshaft degrees of rotation, the ECU has a broad range of time, (degrees of rotation) relatively speaking, to fire a given plug during a cylinder's compression stroke.

Anyway, just a thought.
--
Erwin in Memphis, '88 745t 190,000 miles, '95 855t 92,000 miles






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