Code 43 - Not sure I fully understand...

[hardtailcfl]

So finally got the truck up and running after 2 years of sitting. Got it hooked up to Datamaster and made a couple runs. Both runs tripped Code 43 - ESC Failure. I've gathered that this code is most likely related to the knock sensor being faulty. My question is this...if the computer is throwing Code 43 will the knock sensor still work? Both Datamaster files show knock counts and spark retard (minimal around 4 at the most) but I just want to make sure.

When I bought the truck the knock sensor was disconnected due to false knock from what I was told...please correct me if I'm wrong but 4deg of spark retard is not excessive at WOT and 15psi??

TIA

**EDIT - just realized this is not in the right forum sorry **

 

[Matt]

Re: Code 43 - Not sure I fully understand...

i had the same code on one of my ty's it would only pop up when i got on it, if i drove it easy it was o.k ended up being a failed knock sensor, a bitch to change :rant:, not sure on the torque but i know you can kill them if you over tighten it when you putting one in, also to check it i put a timing light on it at 0 and get a buddy to tap the block with a wrench when it is running, you should see the timing jump all over as it senses the false knock, hope this helps

Matt

 

[hardtailcfl]

Re: Code 43 - Not sure I fully understand...

I haven't tried the timing thing yet but did tap the block while it was running and the Knock LED on my Ultimate guage goes crazy. Is it safe to assume the knock sensor is working then?

 

[Matt]

Re: Code 43 - Not sure I fully understand...

I think it can show knock and still be no good, as mine showed knock even with the bad sensor

 

[hardtailcfl]

Re: Code 43 - Not sure I fully understand...

Well I ordered a new knock sensor from GM part # 10456549...seems like a logical place to start since the knock sensor was disconnected when I bought the truck and I have no idea if it's good or not.

 

[Quickstop [UK]]

Re: Code 43 - Not sure I fully understand...

14lbs of torque, though Campbell only does 12 I think.

4 degrees at 15 psi isn't bad but it's not great. you done the standard tune up stuff? cap, wires, rotor, fuel pump, plugs?

how long has it been sitting? injectors balanced? gummed up?

fuel filter?

afpr?

 

[hardtailcfl]

Re: Code 43 - Not sure I fully understand...

14lbs of torque, though Campbell only does 12 I think.

4 degrees at 15 psi isn't bad but it's not great. you done the standard tune up stuff? cap, wires, rotor, fuel pump, plugs?

how long has it been sitting? injectors balanced? gummed up?

fuel filter?

afpr?

Walbro fuel pump, NGK UR5 gapped at .028, and new wires. I have yet to change the cap and rotor but that is on my list.

Kenne Bell AFPR - don't have a guage so need to get that

It's been sitting for about 18mos - changing the fuel filter tonight, and have run fuel system cleaner through it

It runs really strong minus a little stumble on acceleration and throwing Code 43

 

[Syclone#2960]

Re: Code 43 - Not sure I fully understand...

If the knock sensor is disconnected the trucks will pull 4 degrees of timing automatically as a safety precaution. Imagine that.
My truck is doing the same thing...I'm in the process
]of replacing it.

 

[hardtailcfl]

Re: Code 43 - Not sure I fully understand...

Well thats the wierd thing the spark retard is not flatlined at 4deg. It fluctuates but never pulls more than 4. If the knock sensor is not working correctly will it fluctuate like this or automatically pull 4deg no matter what?

 

[hardtailcfl]

Re: Code 43 - Not sure I fully understand...

Here's a screenshot from my last datamaster run yesterday. 0-60 from a stoplight. Anything look out of the ordinary??

 

[Syclone#2960]

Re: Code 43 - Not sure I fully understand...

It will not go pass 4 degrees of knock retard when reving the motor. The scan tool or Data master will read 0 retard until the motor is reved.