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The 43 code addresses problems with the knock sensor. Check the plug. If it's in good shape check the sensor or control unit.

Answer43 Electronic Spark Timing (EST) circuit - low voltage detected

this usually means module inside distributor is bad. 30 bucks for a new one. will engine run?

AnswerThe engine runs good. Under load and accelaration, the car loses some power and service engine soon light comes on. Normal driving seems OK though. I get a slight pinging on hard accelaration.
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โˆ™ 2011-09-12 22:37:39
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Q: Does anyone know what a 43 code is on the computer for a 1990 full-size Chevy Blazer 350 engine 4-wheel drive?
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