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Code 43

Tiny
KRISTINVANVALKENBURG
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  • 1994 GMC SIERRA
  • 265,960 MILES
What is theit common problem for Code 43 on a 94 gmc sierra half ton 4wd 350?
Sunday, September 16th, 2012 AT 4:28 PM

14 Replies

Tiny
KRISTINVANVALKENBURG
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What is the** oops
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Sunday, September 16th, 2012 AT 4:35 PM
Tiny
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  • MECHANIC
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It is a knock sensor issue. It could be the wiring, connector or the sensor itself.

If you have a scan tool, monitor the timing and then tap on the top of the motor with a hammer and it should retard 4 degrees.

Roy
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Sunday, September 16th, 2012 AT 4:47 PM
Tiny
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Knock sensor is new, would the diagnostic test read a bad knock sensor? Like show up as knock sensor?
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Sunday, September 16th, 2012 AT 4:55 PM
Tiny
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Its already retarding at 4degrees too
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Sunday, September 16th, 2012 AT 4:56 PM
Tiny
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A code number never identifies a bad part, just a failed system.

If the timing is 4 retarded, disconnect the sensor and see if it advances to where it should be.

Roy
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Sunday, September 16th, 2012 AT 5:08 PM
Tiny
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Where should it be?
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Sunday, September 16th, 2012 AT 5:20 PM
Tiny
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It came to a steady 4 degrees, then I pressed the gas and it jumped again ffrom 4 to 2 to 3 to 4
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Sunday, September 16th, 2012 AT 5:21 PM
Tiny
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How did you know is was 4 degrees retarded if you dont know where it should be?

4 degrees before top dead center is the spec.

Roy
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Sunday, September 16th, 2012 AT 5:22 PM
Tiny
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Its just stopped at zero
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Sunday, September 16th, 2012 AT 5:24 PM
Tiny
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How did you check the timing and when did you check it?

Roy
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Sunday, September 16th, 2012 AT 5:26 PM
Tiny
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The diagnostic tester said it was at 4degrees, is that not what you meant?
Top dead center?
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Sunday, September 16th, 2012 AT 5:27 PM
Tiny
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I didnt chk the timing? Im doin what the computers tellin me to do
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Sunday, September 16th, 2012 AT 5:29 PM
Tiny
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The sticker on my truck under the hood says 0degrees
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Sunday, September 16th, 2012 AT 5:50 PM
Tiny
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Do you have a timing light to check it?

Roy
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Sunday, September 16th, 2012 AT 6:06 PM

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