I have a '91 Camaro Z-28 that is throwing the 43 code...Engine acceleration lagging. Knock sensor & pigtail wire harness are new...as is the distributor, ICM, coil, alternator & battery. Is replacing the ESC an option or is that within the ECM for 1991? If so, can it still be tested or think the ECM is only logical next step? Could knock wire proximity to spark plug wire or other trigger code 43? Thanks for the help!

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12-16-2018, 11:55 AM

Tuned Performance

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Car: 1967 Camaro, 91 z28

Engine: Lb9

Transmission: M20

Axle/Gears: J65 pbr on stock posi 10bolt

Re: Code 43

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12-16-2018, 11:57 AM

Tuned Performance

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Car: 1967 Camaro, 91 z28

Engine: Lb9

Transmission: M20

Axle/Gears: J65 pbr on stock posi 10bolt

Re: Code 43

I don’t know if there is a way to test the knock board on the memcal.
i would start with the trouble tree. The knock sensor should read 3.9k ohms by it self.
if you determine you need a 1227730 ecm or memcal send me a pm. I have them

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01-06-2019, 02:38 PM

walkingdead5

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Car: 1991 Camaro Z-28

Engine: 305 TPI

Transmission: 700R4

Re: Code 43

Thanks for the info and sorry for the delayed response. I put in a brand new KS and same problem occurred (SEL: code 43). The pigtail wire put out 5v., but the KS had 0 ohms of resisitence, so it was actually defective! I purchased a second brand new KS and that yielded 3.9k ohms...problem solved! I will keep your contact info on hand should an ECM be needed in future...Z is 28 years old, so may be sooner than later! Ha!

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