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Re: Ari - question... Posted by Ari [Email] ![]() ![]() In Reply to: Ari - question..., KeithG, Fri, 11 May 2001 10:32:40 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I'm pretty sure that in the newer cars, even those with a distributor use a crank sensor. I know I've seen distributor engines in NG900s that used a crank sensor. One easy way to tell - if there is a connector on the side of the distributor to bring out the signals for the Hall effect sensor, then the distributor is providing the timing signal. No connector, then the distributor is only distributing spark.
I could see how a worn chain could cause 'wander' in timing in engines where the distributor is driven off the cam. However, I can think of other reasons (mechanical advance problems, shaft end-play, loose pickup or 'window' plate, etc) that could cause wandering timing without it being the chain. Also, if the engine is running poorly, there will be variations in both engine speed and manifold vacuum, and that can feed back into the timing (which would affect engine speed and manifold vacuum).
So - a wandering timing mark may indicate a worn timing chain, but it could easily be caused by other problems. Perhaps when the new chain was installed, along with a new valve cover gasket, that sealed a valve cover leak which stabilized the idle.
I'll stick by pulling the valve cover and inspecting the chain as being the gold standard.
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