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Discussion Starter #1
After reaching normal operating temperature, it shuts off for 15 minutes then will re-start and run for a few minutes, over and over again.
I have replaced the ECT, thermostat, juggled fusible links & reset the ECU (pulled the fuse & discharged capacitors).
I thought it was caused by engine coolant temperature hitting 180degF, but with the heater fan going full blast, it shuts off at 140 degF.
I suspect some sensor is heating up and telling the ECU to stop spark or fuel injection, but which one?
 

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Discussion Starter #3
I pulled the crank sensor to check for whiskers but it was clean. The clutch housing would not heat up much so I don't see how it could generate a degraded signal then recover to start the engine so quickly and run so well until the next shut down.
My INNOVA 3130 diagnostic tool displays no error codes and the live display shows no odd trends just before the engine quits.
 

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After reaching normal operating temperature, it shuts off for 15 minutes then will re-start and run for a few minutes, over and over again.
I have replaced the ECT, thermostat, juggled fusible links & reset the ECU (pulled the fuse & discharged capacitors).
I thought it was caused by engine coolant temperature hitting 180degF, but with the heater fan going full blast, it shuts off at 140 degF.
I suspect some sensor is heating up and telling the ECU to stop spark or fuel injection, but which one?
Wiring is good.....replace the sensor.



00000732


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Thanks,
Welcome aboard.
 

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Discussion Starter #5
I think you fellows may be correct...I directed a fine spray of water at the crankshaft position sensor and the engine ran for a very long time before quitting.
I will replace it tomorrow and let you know if it cured the chronic napping.
 

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The clutch housing would not heat up much so I don't see how it could generate a degraded signal then recover to start the engine so quickly
I don't know what sensor you were looking at but the crank sensor is on the engine block, not the clutch housing.

Yamoffathoo said:
My INNOVA 3130 diagnostic tool displays no error codes
That's normal for a crank sensor failure.


 

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Discussion Starter #7
But its pretty close to the clutch housing and there is a good breeze generated by the whirling ring gear behind.
 

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Discussion Starter #8
The chronic napping problem appears to have been fixed with the replacement of the crank position sensor!!!

Thanks for suggesting it GRCAUTO and AUTOSPARK.
 
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