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Old 09-04-2004, 12:38 PM   #1
cshuman
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Default Code 43

Car set a code 42 so I changed the distributor module, that didnt fix it so I changed the ECM like others here have done. That fixed the code 42, but now I get a code 43, so I changed the knock sensor, no luck.
Any Ideas?
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Old 09-04-2004, 01:12 PM   #2
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Follow the trouble shooting charts in your Helms for the various codes received. A code indicates that an out of parameter reading was sent by the coded source (sensor). That doesn't necessarilly mean that the source of the code was the cause of the code.
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Old 09-04-2004, 01:13 PM   #3
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Follow the trouble shooting charts in your Helms for the various codes received. A code indicates that an out of parameter reading was sent by the coded source (sensor). That doesn't necessarily mean that the source of the code was the cause of the code.

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Old 09-04-2004, 01:33 PM   #4
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See threads:

http://forums.corvetteforum.com/c4-tech-performance/886445-getting-code-43-knock-sensor.html

and

http://forums.corvetteforum.com/c4-tech-performance/874729-1985-a4-check-engine-light-on-and-off.html

They might help...

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Old 09-04-2004, 02:30 PM   #5
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I have a Haynes manual, and it says to check the wiring and replace the knock sensor. I don't think that I have a ESC module, do I? If so I can't find it on my 91, its not on the side of the blower housing.
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Old 09-04-2004, 03:49 PM   #6
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ttt. any other ideas?
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Old 09-06-2004, 10:47 AM   #7
cshuman
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I found a broken ground wire, but still have code 43, could it have damaged the new ECM or some other item? I disconnected the battery to reset the codes but still have 43
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Old 09-06-2004, 01:38 PM   #8
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Haynes manuals aren't really good for specific trouble shooting... they try and cover everything... find the helms manual for your specific year... it'll help you track down the source of the problem...
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Old 09-08-2004, 07:01 PM   #9
cshuman
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OK, I got a flow chart for repair of code 43 from a mechanic I know. It leads to the ECM or the memcal (Prom). Got another ECM from Advance Auto and I still get code 43 right after startup.
Anyone have any ideas, I need help?

Thanks
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Old 09-08-2004, 07:28 PM   #10
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Hi,

If you seen some of my threads on the same subject I have been chasing a similar problem.

I think in my case (maybe yours too) that it could be a false code 43. I think in my case its a ignition problem. Your 1991 is different than my 1992 (as I am sure you know).

So maybe what you could look at is what can cause a false code.

When I get this fix I will post.

Good luck,

Steven
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Old 09-08-2004, 07:31 PM   #11
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Quote:
Originally Posted by cshuman
OK, I got a flow chart for repair of code 43 from a mechanic I know. It leads to the ECM or the memcal (Prom). Got another ECM from Advance Auto and I still get code 43 right after startup.
Anyone have any ideas, I need help?

Thanks
I have no idea how that "flow chart" compares to a genuine Chevrolet Service Manual, printed by Helms, but you have far exceeded it's cost in unneeded parts. You can keep guessing and throwing money at it, or just go to www.helminc.com and buy the book. Maybe they will take slightly used, but unneeded parts, as payment.

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Old 09-09-2004, 02:27 PM   #12
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Have you inspected the knock sensor? It may simply be caked with oil or grease and throwing a false code 43 on start-up. That's what the problem ended up being on my '92.

When it comes to auto repair ALWAYS assume the simple, first!
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Old 09-09-2004, 02:27 PM
 
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