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Crankshaft sensor

Tiny
MARVIN ROBINSON
  • MEMBER
  • 1997 FORD F-250
  • 5.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
No crank sensor! This is an oddball truck heavy duty with EEC system. Has intermittent shutting off and starting. No fire, has fuel pressure and turns over. Weather or heat doe snot change anything.
Monday, May 21st, 2018 AT 3:35 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening.

Too early for a crank sensor since it has a distributor.

Go to the ignition coil and be sure it has power to the coil. Then check the voltage on the negative side as well.

Roy
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Monday, May 21st, 2018 AT 5:39 PM
Tiny
MARVIN ROBINSON
  • MEMBER
  • 3 POSTS
Tap test took me to coil plug was deteriorated and crumbling so I replaced that plug, will not quit long enough to test voltage.
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Monday, May 21st, 2018 AT 5:55 PM
Tiny
ASEMASTER6371
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This test is done with key on engine off. Use a test light. Check for power on the positive side. Then you should have the same voltage on the negative side.

Then crank the engine with the test light on the negative side and see if the test light flashes.

Roy
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Monday, May 21st, 2018 AT 6:37 PM
Tiny
MARVIN ROBINSON
  • MEMBER
  • 3 POSTS
No voltage on the negative side would lead me to a ignition control module? Just waiting for it to quit again to do this test thank you.
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Monday, May 21st, 2018 AT 6:52 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
If there is no voltage then the coil is bad.
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Monday, May 21st, 2018 AT 7:27 PM

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