Workhorse chassis, 7.4 V8 454. Had an extended crank, and it didnt catch, turned it off and restarted and fired right up. Service engine soon light came on. Stop at a repair shop and they got a code for the crankshift position sensor. Also a 1 and 4 ignition coil. He told me the coils could be in relation to the csp. In clearwater, fl heading to disney then back to nort westeren il. The engine fired right up after cooling all night. It is not missing while running. Running as smooth as it had the last two days. Not sure if I should worry about it here, or finish my trip and get it fixed at home? Any suggestions??

I have seen engines get a fault code like you described, why it didn't start right away may never happen again, clear the codes and see if they return. I would not worry about it. All those electronic controls sometimes act just like my personal computer and "get a mind of their own" and it never happens again. I hope this helps, Bill

Might have been a one time hiccup or the sensor is starting to fail. When it fails you will need to be towed. If you have time while in Orlando and the kids are enjoying It's A Small World take coach somewhere and get it replaced along with the coils. The sensor is part of the ignition timing loop. Without the sender the system does not know when to trigger the spark plugs to fire. Replaced the mechanical distributor.

You had a no start event and you have a trouble code that indicates a problem with the crank position sensor or the circuitry to it. From my experience, I would suspect that you will have trouble with it in the future. These issues don't generally heal themselves. When it will fail again is anybody's guess.Did your shop run any test on the senor/circuit? A simple resistance test at the PCM connector will often lead to the source of the problem.

Thank you guys for the replies. No other tests were ran. He just told me it may fail tomorrow or never again. That he could search for more issues, but it could take hours to diagnose, that he would rather have it come to his shop dead as it is easier to troubleshoot then. He said to watch for it running sluggishly and for the sevice engine light soon to flash. Amd if it starts flashing to pull over as the vehicle could shut down even if I am doing 70 going down the road.

If the engine has sequential port EFI, that position sensor also signals the fuel injectors when to squirt. Depending on how it fails, you may get fuel flooding and a potential for a fire.

Crankshift Position Sensor???? | Good Sam Community

13 Replies

dougmac
Explorer
Jun 16, 2013
You had a no start event and you have a trouble code that indicates a problem with the crank position sensor or the circuitry to it. From my experience, I would suspect that you will have trouble with it in the future. These issues don't generally heal themselves. When it will fail again is anybody's guess.

Did your shop run any test on the senor/circuit? A simple resistance test at the PCM connector will often lead to the source of the problem.
Dale_Traveling
Explorer II
Jun 16, 2013
Might have been a one time hiccup or the sensor is starting to fail. When it fails you will need to be towed. If you have time while in Orlando and the kids are enjoying It's A Small World take coach somewhere and get it replaced along with the coils. The sensor is part of the ignition timing loop. Without the sender the system does not know when to trigger the spark plugs to fire. Replaced the mechanical distributor.
barnaclebill
Explorer
Jun 16, 2013
I have seen engines get a fault code like you described, why it didn't start right away may never happen again, clear the codes and see if they return. I would not worry about it. All those electronic controls sometimes act just like my personal computer and "get a mind of their own" and it never happens again. I hope this helps, Bill

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Crankshift Position Sensor????

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