Code 43

Tiny
LAYLO.C10
  • MEMBER
  • 1994 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 210,000 MILES
I am currently getting a code 43. New knock sensor new module new ECM and it is still popping up code 43. Truck has been rebuilt just top end with mild cam roller rockers lifter etc. I need your assistance. Thanks in advance.
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Sunday, March 25th, 2018 AT 9:17 AM

31 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good afternoon.

Is the cam a solid lift or hydraulic lifters?

Roy
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Sunday, March 25th, 2018 AT 3:33 PM
Tiny
LAYLO.C10
  • MEMBER
That I am not sure. Guy had it put it and is not sure of the cam specs. I also noticed the scanner does not read when a performance chip is installed. Thanks for your reply!

Ed
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Sunday, March 25th, 2018 AT 3:50 PM
Tiny
ASEMASTER6371
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That is correct about the scan tool.

If it is a solid lifter cam, the noise from the lifters will set the code as the knock sensor will pick it up and think it is a detonation issue.

Roy
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Sunday, March 25th, 2018 AT 3:55 PM
Tiny
LAYLO.C10
  • MEMBER
Might be an issue. I have set the lifters but they still make a tick noise when idle.
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Sunday, March 25th, 2018 AT 4:30 PM
Tiny
ASEMASTER6371
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That would be enough to set the knock sensor off.

Roy
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Sunday, March 25th, 2018 AT 4:31 PM
Tiny
LAYLO.C10
  • MEMBER
Correction, I adjusted the rocker arms.
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Sunday, March 25th, 2018 AT 4:31 PM
Tiny
LAYLO.C10
  • MEMBER
What do you recommend for a fix? I think you are correct because once I changed the knock sensor it tripped this code. It does not erase pops up on first start.
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Sunday, March 25th, 2018 AT 4:33 PM
Tiny
ASEMASTER6371
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OBD 1 does not erase. When the issue is repaired, the light will go out on its own.

With engine modification and a chip, there will be no fix unless you replace the cam with the original one that did not produce any noise.

Roy
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Sunday, March 25th, 2018 AT 4:35 PM
Tiny
LAYLO.C10
  • MEMBER
The original cam is no longer around. I would like to keep it with a bigger cam if possible I want more power out of it. Any recommendations?
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Sunday, March 25th, 2018 AT 4:38 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay, cam is not the only thing for more power. Headers will help a lot, bigger injectors, higher pressure fuel pump and air intake system.

Having the distributor worked will help with timing as well. Lighter weights are a good start.

Roy
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Sunday, March 25th, 2018 AT 4:43 PM
Tiny
LAYLO.C10
  • MEMBER
It has got all of the above done to it. That is why I am stumped as to why it does not run as it should. I changed all sensors thinking it would fix it, but no.
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Sunday, March 25th, 2018 AT 4:45 PM
Tiny
ASEMASTER6371
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Okay, how do you think it should run?

Roy
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Sunday, March 25th, 2018 AT 4:50 PM
Tiny
LAYLO.C10
  • MEMBER
I am not sure that is why I am on here. It is not idling right and the check engine is not going away. I rather not tear it apart for a stock cam if there is a way to fix it without taking it out that would be greatly appreciated.
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Sunday, March 25th, 2018 AT 4:56 PM
Tiny
ASEMASTER6371
  • EXPERT
The check engine light may need to remain if you are looking for performance.

The idle may be from the camshaft. If it has a performance cam, it may have a lopy idle.

You need to find out what cam is in the engine. You will need valve settings and timing settings as well.

That information is required to get it to run at max performance.

Roy
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Sunday, March 25th, 2018 AT 5:00 PM
Tiny
LAYLO.C10
  • MEMBER
Okay, so how do I go about getting this information? I am desperate in getting this to run better trucks been sitting for a year. I just feel like it is lacking power throttle response is not well, it pings when revved up. Smells bad when idle.
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Sunday, March 25th, 2018 AT 5:08 PM
Tiny
LAYLO.C10
  • MEMBER
I wish I could show you the truck and show you what I am seeing. I hate to have this go to waste.
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Sunday, March 25th, 2018 AT 5:09 PM
Tiny
ASEMASTER6371
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You will need to contact the previous owner to find what exactly what was done. Get the cam type and all specs.

Roy
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Sunday, March 25th, 2018 AT 5:14 PM
Tiny
LAYLO.C10
  • MEMBER
If it is the solid cam what needs to be done to eliminate the tick?
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Sunday, March 25th, 2018 AT 5:23 PM
Tiny
ASEMASTER6371
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Solid lifter cams will make noise due to valve clearance specs. You cannot get rid of the noise.

Roy
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Sunday, March 25th, 2018 AT 5:28 PM
Tiny
LAYLO.C10
  • MEMBER
So what can I do? I am completely lost now.
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Sunday, March 25th, 2018 AT 5:31 PM

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