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The crank sensor on a 4.3 Blazer is located at the front of the engine, under the crank shaft pulley.

To replace it, remove the wire plug and the 8mm bolt holding it to the timing cover.

Clean the area up before installing the new sensor, lubricate the )-ring on the new sensor with motor oli before installing it. Snug up the bolt and replace the wire connector.

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Q: How do you change crank sensor on 99' BLAZER?
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