On the SHO, the rear cam seal, which sits behind the camshaft positioning sensor, is prone to leaking since it is below the oil line on the heads of the engine. Once the seal leaks, and usually the case if installed inproperly, it will foul up the camshaft sensor and prevent it from opperating correctly. As a result of failure, the computer will either throw a code saying the camshaft sensor is failing or the engine will have a very hard time starting. This happens because the crankshaft positioning sensor and the camshaft positioning sensor work together in letting the computer know what stroke it is on and whether it is the compression stroke or the exhaust stroke. Failure in this causes the computer to guess which stroke it is on to fire the spark plugs, giving a 50/50 chance of success. After about three tries, the engine is usually flooded if the computer does not guess the right stroke. If the engine has a oil leaking out of the camshaft sensor housing, generally a sign that the sensor is failing or will fail.
To fix this issue, replace the sensor and rear camshaft seal.
Replacement of this part is recommended with changing the rear cam seal. Be cautious to clean all oil off the end of the camshaft as well as the housing to prevent any oil from comming in contact with the sensor. The sensors are very sensitve.
1989-1995 Taurus SHO
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