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More specifically Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 7 May 2004 08:43:25
In Reply to: Crank sensor?, JB, Thu, 6 May 2004 17:46:11 Members do not see ads below this line. - Help Keep This Site Online - Signup |
It provides both crank angle and engine speed. Why is crank angle important? It tells the ECU where the pistons are so it knows when to tell the spark plugs to fire. And if the engine isn't spinning, (or the ECU doesn't know it's spinning) the fuel pump won't run. In the old days ignition timing was done with a distributor. Nowdays it's direct ignition and crank angle measurement.
A bad sensor would cause both no spark and no fuel. A double-whammy for no-start. It's not uncommon for the sensor to fail intermittent, especially when it gets warm, so what you're seeing isn't uncommon. When you crank the engine, look at the tachometer. When things are going right, the tachometer needle should 'bounce' as you crank it. Actually, the engine should just start. But if the needle just sits there when you (unsuccessfully) crank the engine, it's telling you that the tach doesn't think the engine is turning. And the CPS tells the tach (and engine control) that the engine is turning.
The sensor is mounted down by the crankshaft.
posted by 192.249....
, Fri, 7 May 2004 08:43:25 <-- Viewing This Message
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