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05-12-2024
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#1 |
 Join Date: Oct 2011
Location: new jersey
Posts: 10
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Help with code 43 and 55
Good morning all took my 90 out last night car was running fine then service light came on and she wasn?t running right went home checked codes and found code 43 and 55. Any advice on where to start with these codes?
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05-12-2024
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#2 |
Join Date: Jan 2024
Location: Houston, Texas
Posts: 28
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Re: Help with code 43 and 55
Had the same recently with mine with code 43 only. Did it by chance happen after driving and it being at operating temp a while and shutting off and restarting? Mine has done it a few times and it?s gone away. FSM points to it being a knock sensor. I just picked up a new one but have yet to install it.
If you don?t have a FSM I can snap a pic of the code 55 as well to help. |
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05-15-2024
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#3 | |
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Join Date: Oct 2011
Location: new jersey
Posts: 10
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Re: Help with code 43 and 55
Quote:
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05-15-2024
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#4 | |
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Join Date: Jan 2024
Location: Houston, Texas
Posts: 28
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Re: Help with code 43 and 55
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1992 #422 - 100k+ mi. Stock with coil overs 1969 Camaro - restomod w/ 1000+ rwhp. 1969 C10 - LS2 / 4l80e |
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05-12-2024
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#5 |
Join Date: May 2013
Location: Chicago
Posts: 979
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Re: Help with code 43 and 55
The knock sensor is on the driver side and is mounted "dry" into the block so it can be removed and no coolant will come out.
I had a code 43 years ago and my knock sensor was not mounted tightly as it would spin without a socket. I would start there.
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* |
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05-12-2024
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#6 |
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Join Date: Jan 2024
Location: Houston, Texas
Posts: 28
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Re: Help with code 43 and 55
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05-12-2024
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#7 |
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Join Date: May 2013
Location: Chicago
Posts: 979
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Re: Help with code 43 and 55
Yep that's it.
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* |
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05-13-2024
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#8 |
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Join Date: Jan 2024
Location: Houston, Texas
Posts: 28
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Re: Help with code 43 and 55
One thing I will say from quick search so verify it, is that code 55 is a O2 lean condition. I?d have some concern that if it?s running lean the knock sensor code may be related to it as well.
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05-13-2024
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#9 |
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Join Date: Oct 2011
Location: new jersey
Posts: 10
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Re: Help with code 43 and 55
I thought code 55 was a voltage code not a lean code
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05-13-2024
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#10 | |
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Join Date: Jan 2024
Location: Houston, Texas
Posts: 28
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Re: Help with code 43 and 55
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