Question about 1991 Chevrolet S-10 Blazer

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On my 1991 chevy blazer s10 I get error code 43. What is it and how do I fix it

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Hi, the indication is that your computer is not receiving a good signal from the knock sensor. Recommend you check the connector on the sensor and the wire. Also make sure the sensor isn't loose in the block. If those look good, you may want to just replace the sensor. A new one is $30 at autozone. Without the knock sensor signal, the computer will default the ignition timing toward a less fuel efficient value. The sensor looks like the picture below and is mounted in the engine block. You may have 2 knock sensors--one on each side of the engine. Sorry, but I could not find a good picture of the location. I will keep looking for one, though.

on my 1991 chevy blazer - jturcotte_426.jpg

Posted on Apr 08, 2011

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Code 43 throttle position sensor (tps) out of adjustment, check the wiring, ifeverything looks normal, then maybe you need a new one,
also code 43 calls for knock sensor signal, but i dont think this is the case
i woule go for the tps first. Thanks

Posted on Apr 08, 2011

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