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Posted on Jan 26, 2011

Where is the knock sensor on 1991 2500 chevy truck

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jose fonseca e

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  • Contributor 17 Answers
  • Posted on Jan 26, 2011
jose fonseca e
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Joined: Jan 25, 2011
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On passenger side of the engine near the starter motor single wire

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I have a 1994 1500 Chevy truck. Can't find the knock sensor. Vortex engine if that matters Removed distributor, not there. Can't find it around the starter or left side

The Knock Sensoris located: Under hood, passenger side, lower engine area, front of starter, mounted in engine block .Here's a link to what your knock sensor look's like.
Knock Sensor
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Nathan, 2 Knock's are located under intake manifold.
Check the attached links,
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You have two knock sensor's, both sit under the in-take magifold on top of the engine, you will have to remove injector rail and in-take.
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You didn't list your engine size so please pick the applicable to your motor size:

Removal & Installation 2.8L & 2.9L Engines To Remove:
  1. Lift the vehicle high enough to gain access to the knock sensor (KS) through the left front wheelhouse.
  2. Remove the left front wheel and wheelhouse liner.
Knock sensor (KS) (A), Engine harness (B), Knock sensor (KS) connector (C)


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  1. Disconnect the knock sensor (KS) connector.
  2. Detach the knock sensor (KS) from the engine block.
To Install:
  1. Attach the knock sensor (KS) to the engine block.
    • Tighten the bolt to 18 ft lbs (25 Nm).
  2. Connect the knock sensor (KS) connector.
  3. Install the left front wheelhouse liner and wheel.
  4. Fully lower the vehicle.
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knock sensor is on the passenger side of engine block, some knock sensors fit into water jacket others did not
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