CODE 43

  • Tiny
  • kristinvanvalkenburg
  • 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 Answers

  • Tiny
  • kristinvanvalkenburg
  • Member

What is the** oops

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Sunday, September 16th, 2012 AT 4:35 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

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
  • kristinvanvalkenburg
  • Member

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
  • kristinvanvalkenburg
  • Member

Its already retarding at 4degrees too

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Sunday, September 16th, 2012 AT 4:56 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

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
  • kristinvanvalkenburg
  • Member

Where should it be?

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Sunday, September 16th, 2012 AT 5:20 PM
  • Tiny
  • kristinvanvalkenburg
  • Member

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
  • ASEMaster6371
  • Expert
  • 25,502 posts

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
  • kristinvanvalkenburg
  • Member

Its just stopped at zero

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Sunday, September 16th, 2012 AT 5:24 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

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

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