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Check the crankshaft sensor again. It may have come loose, or the electrical connection may be loose. If there was physical damage to the old crankshaft sensor, the new one may have become damaged also. If everything is ok with the new sensor, scan the computer for fresh trouble codes.
Remove the serpentine drive belt from the crankshaft pulley.
Raise and safely support the vehicle.
Remove the right front wheel and tire assembly and the right inner fender access cover/splash shield.
Using a 28mm socket, remove the crankshaft harmonic balancer retaining bolt.
Remove the crankshaft balancer, using a puller if necessary.
For 1992-99 vehicles, remove the CKP sensor shield.
Fig. 1: If so equipped, remove the crankshaft position sensor shield
Unplug the sensor electrical connector.
For 1987-91 vehicles, perform the following:
Remove the sensor and pedestal from the block face.
Remove the sensor from the pedestal.
For 1992-99 vehicles, remove the sensor from the block face.
To install:
For 1987-91 vehicles, perform the following:
Loosely install the crankshaft sensor on the pedestal.
Position the sensor, with the pedestal attached, on crankshaft sensor installation tool J 37089 or equivalent.
Install the bolt to hold the pedestal to the block face, then tighten to 14-28 ft. lbs. (20-40 Nm).
Fig. 2: Position the crankshaft sensor tool on the crankshaft
Fig. 3: Insert the crankshaft sensor tool into the harmonic balancer
Tighten the pedestal pinch bolt to 30-35 inch lbs. (3-4 Nm).
Remove the special tool.
Place the crankshaft sensor tool on the crankshaft balancer and turn. If any vane on the harmonic balancer touches the tool, replace the balancer.
For 1992-99 vehicles, install the CKP sensor on the block.
Install the retaining bolts and tighten to 14-28 ft. lbs. (20-40 Nm).
Install the crankshaft position sensor shield.
Attach the sensor electrical connector.
Install the balancer on the crankshaft.
Tighten the crankshaft bolt to 200-239 ft. lbs. (270-325 Nm) for 1987-91 vehicles. For 1992-99 vehicles, tighten to 110 ft. lbs. (150 Nm), plus an additional 76°rotation.
Install the inner fender shield and the right tire and wheel assembly.
Code 1391 = An intermittant loss of CMP (crankshaft position sensor) or CKP (crankshaft position sensor. This code could be related to just a bad connection at either sensor or the wiring harness, check the connections and be sure they are clean and tight fitting with no loose wire connections also within the connector itself. Otherwise you may end up replacing one or both of theses sensors to correct this issue,unless you have an oscilloscope to isolate which sensor.
It is likely that you have a loose connection at the sensor somewhere between the sensor and the computer. Start by checking the terminations at the door sensor, and if they are tight, use a ohmeter and check the contact resistance for the switch in both open and closed positions. It could be that the switch is shot.
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