does the sho have a oil shut off?

[Revere sho]

If there is like no oil or almost no oil in the car would the engine shut down? I'm asking this basic question because I recently had a problem with my sho spilling out oil from the cam seal. I noticed that it wasn't spilling it anymore and the car shut off on its own and would start back up. So I just wanted to know if that could be the reason why it won't start?

<small>[ March 10, 2004, 09:36 AM: Message edited by: AutoSHO ]</small>

 

[projectSHO89]

There is no automatic mechanism other than friction/heat that will shut down the engine.

Steve

 

[Revere sho]

by any chance would that cause it not to start back up?

 

[jelloslug]

If you lock up the engine it won't start back.

 

[Revere sho]

Oh, you're talking about seizing the engine. I didn't sieze it at all, I can still turn the engine. It just doesn't have a spark. Would that be either the crank sensor or the cam sensor that would cause it not to start?

<small>[ March 10, 2004, 09:38 AM: Message edited by: AutoSHO ]</small>

 

[sdpatt]

The CID sensor (cylinder identification or cam sensor) synchronizes the spark to the cylinders and will not prevent the engine from starting, but since the EEC has only a one in three chance of guessing the correct cylinder, the engine can backfire and buck severely while cranking.

The CPS (crankshaft position sensor) on the other hand, can definitely render the engine with no spark. With no signal from this sensor, the EEC has no indication that the engine is rotating and will not trigger spark or fuel injectors. The tachometer will also stay resting on the "0" peg while the engine is cranking if this sensor has gone into a failure mode.

You should see the yellow "LOW OIL" light and the red "OIL" (low oil pressure) light before the engine succumbs to lack of lubrication.

And finally, please don't preface a question with the phrase, "this is a stupid question" as you predetermine the attitude with which you are addressed.

<small>[ March 10, 2004, 09:15 AM: Message edited by: sdpatt ]</small>

 

[Revere sho]

The CID sensor (cylinder identification or cam sensor) synchronizes the spark to the cylinders and will not prevent the engine from starting, but since the EEC has only a one in three chance of guessing the correct cylinder, the engine can backfire and buck severely while cranking.

The CPS (crankshaft position sensor) on the other hand, can definitely render the engine with no spark. With no signal from this sensor, the EEC has no indication that the engine is rotating and will not trigger spark or fuel injectors. The tachometer will also stay resting on the "0" peg while the engine is cranking if this sensor has gone into a failure mode.

You should see the yellow "LOW OIL" light and the red "OIL" (low oil pressure) light before the engine succumbs to lack of lubrication.

And finally, please don't preface a question with the phrase, "this is a stupid question" as you predetermine the attitude with which you are addressed.

[ March 10, 2004, 09:15 AM: Message edited by: sdpatt ]

if the car is already running is it possible for the the crank sensor to just fail and the car to just shut down and not start back up?

 

[sdpatt]

Yes. After killing the engine as if you turned off the ignition key, the CPS may "reset" and allow the engine to restart after anywhere from a split second to several hours to never. The CPS usually fails in a manner that gives you a few warning events before it fails completely. The Motorcraft, Borg-Warner and Wells brands I have used on my own engine have always given the shorter warning failure events before failing catastrophically and permanently.

There should be an EEC error code set to indicate this sensor is faulting. The CHECK ENGINE light will only illuminate for a split second, but I have witnessed this during a CPS failure.

As a side note, I will add that I believe that the most common failure mode of the CPS is not moisture from a coolant leak, but vibration induced internal discontinuities. The sensor is epoxy sealed and rather impervious to moisture.

I have found on several occasions, however, indications that sensor installation misalignment or debris buildup on the inside face of the sensor wheel vanes has resulted in contact between the rotating sensor shutter wheel and the arm of the CPS. This contact would result in an impact to the sensor on each engine revolution. This impact would shock the sensor into possible breaks in the internal circuit board (yes, I took a failed CPS apart to see what had failed - this is known as destructive examination) and soldered wiring terminations.

<small>[ March 10, 2004, 11:24 AM: Message edited by: sdpatt ]</small>