Hi i have 98.5 24 valve that will spin over but will not crank.This truck is not my daily driver but cranked it up to move it ran like a champ.When i was ready to move it back about an hour later will not start spins over nothing.Checked for codes got p0336 p0380 p1689.Has anyone got any ideas where i should start?thanks
98.5 woint crank
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start by troubleshooting your codes
https://mopar1973man.com/cummins/ar...generation_50/51_engine/obdii-error-codes_94/
I am assuming you mean it will crank, but will not fire and run?
or is the starter sprinning, but not catching the flywheel to start the engine?
https://mopar1973man.com/cummins/ar...generation_50/51_engine/obdii-error-codes_94/
I am assuming you mean it will crank, but will not fire and run?
or is the starter sprinning, but not catching the flywheel to start the engine?
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Minor correction to terminology. "Spin over" is Crank. Run or fire are Run. No crank is starter not cranking it over.
Codes are usually fairly accurate.
Does the Tach move up to 200 or so during starter cranking?
336 Code indicates a bod crank shaft position sensor. It is usually just that but can be a bad connection in the harness between the sensor and the VP
Crank sensor is behind the starter on side of the block, fairly easy replacement usually. Do not buy cheapest available. Get name brand or good store brand.
Codes are usually fairly accurate.
Does the Tach move up to 200 or so during starter cranking?
336 Code indicates a bod crank shaft position sensor. It is usually just that but can be a bad connection in the harness between the sensor and the VP
Crank sensor is behind the starter on side of the block, fairly easy replacement usually. Do not buy cheapest available. Get name brand or good store brand.
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A bad crank sensor will cause it to miss, die after starting or not start at all. Same goes for a bad wire. However, the tach not showing 200 when cranking is a good definitive symptom that no signal is being received from or sent by the sensor.
A bad crank sensor may not throw a code and may cause a no-start or intermittent no-start situation. I had this happen twice. The 1st replacement was a Cummins sensor and the 2nd was a Wells. The Wells is still working (unless it quit last night). Don't condemn the sensor until every other cause has been eliminated.
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Bur in this case he does have a code for the sensor signal. No communication means the ECM is not getting a signal from the sensor. It is a common issue.
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