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I have a 1994 chevy p/u 5.7 motor.it does not get spark to the distributer,also the rotor is not turning.

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  • Chevrolet Master
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Oops, if the rotor is not turning in the distributor, it sounds like the timing chain may have broken.

Also, the Crank sensor may be bad.
TESTING

  1. Disconnect the CKP sensor harness. Connect an LED test light between battery ground and CKP harness terminal A.
  2. With the ignition ON and the engine off, verify that the test light illuminates.
  3. If not as specified, repair or replace the fuse and/or wiring.
  4. Carefully connect the test light between CKP harness terminal A and B. Verify that the test light illuminates. Fig. 1: Crankshaft Position (CKP) sensor wiring diagram i have a 1994 chevy - 87984w12.gif

  5. If not as specified, repair the CKP harness ground circuit (terminal B).
  6. Turn the ignition OFF and disconnect the test light.
  7. Next, connect suitable jumper wires between the CKP sensor and CKP sensor harness. Connect a duty cycle meter to the jumper wire corresponding to CKP terminal C and battery ground.
  8. Crank the engine and verify that the duty cycle signal is between 40–60%.
  9. If it is not as specified, the CKP sensor may be faulty.
  10. Next, connect a AC volt meter to the jumper wire corresponding to CKP terminal C and battery ground.
  11. Crank the engine and verify that the AC voltage signal is at least 10.0 volts.
  12. If not as specified the CKP sensor may be faulty.
---
Also the Crankshaft position sensor 'reluctor' ring is located in same area:

Fig. 2: Camshaft and related parts — 5.0L, 5.7L, 6.2L, 6.5L and 7.4L engines 84903182.gif
Fig. 3: Crankshaft position sensor reluctor ring location — 4.3L, 5.0L, 5.7L engines 87983g1l.gif

Posted on Jul 12, 2010

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