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Code 43 - ESC/knock sensor

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1993 Caprice with L05 engine

Getting code 43 and poor performance, acceleration and mileage

Replaced the knock sensor and the knock sensor module twice. No change. CEL flashes constantly at speeds of 55.

What else could it be?

This L05 came from a "9C1" police vehicle. The difference is in cam and injector. Is there different cam confusing the computer? I am going to try the "9C1" computer and see if that changes anything.

Reply to
An Metet
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Code 43 can be set by improper timing. Check to make sure that your timing is correct. You might need to check to see if your balancer has slipped and the outer ring is showing the correct timing but it's off and therefore your "correct timing" isn't correct.

-Bruce

Reply to
Bruce Chang

Most likely, the ECM is getting a continuous knock signal from the sensor, causing it to constantly retard the spark timing (a scan tool would help to verify this). The question is why - could it be picking up some other noise from the engine?

Reply to
Robert Hancock

Robert,

Went on your web page and found it most useful, especially the OBD11 information.

Here is a sample for this newsgroup:

Anatomy of the DTC:

A DTC is made up of 5 digits.

Digit 1: B= Body, C= Chassis, P = Powertrain, U= Network

Digit 2: 0= SAE, 1= MFG

Digit 3: 1= Fuel and air metering, 2= Fuel and air metering (infector circuit, 3= Ignition systems or misfire, 4= Auxiliary emission controls, 5= Vehicle speed control and idle control system, 6= Computer output circuit, 7 and 8= Transmission

Digits 4 and 5: Fault (00-99)

Thanks Hank From PA....

Reply to
Hank

Or stray voltage getting into the harness.

Reply to
saeengineer

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