Code 43 indicates a fault in the ESC (electronic spark control) system. It usually means the knock sensor has failed, or the wiring to the knock sensor is faulty. When this fails it causes the computer to retard the spark timing to protect the engine, resulting in stalling, poor performance and reduced mileage.
Got it - cracked Engine Coolant Temp sensor for computer - guess I was tired when I first looked and missed it on the scan tool, (I was sick the day before and stayed home from work) it was showing -1 to 5 degrees when the car had been sitting for 24 hours and intake air temp was 43 degrees. Replaced the sensor and did a tune up, all is great again.
code 43 is related to the spark control system. (esc) the problem is usually the knock sensor wiring connector is defective and/or the sensor. the sensor is located in the right /passenger side of the engine block near the starter.
The camshaft position sensor on a 4.3L engine is inside the distributor near the rear of the engine. Has the intake manifold gasket been replaced? Sometimes it is overlooked to plug the sensor back in after this repair has been done.
109.4 F
there isn't one.
There is 2 on that engine and both of them are screwed into the exhaust pipes up close were they bolt to the engine. They will be about 3 to 4 inches long with an elctric wire coming from them.
code 43 except2.2or2.5 4flashes pause 3flashes electronic sparkcontrol knock sensor circuit probable cause faulty knock sensor or mem_cal.
Code 21 is coolant temperature high. A faulty thermostat stuck closed or a defective coolant temperature switch could be the cause. Code 43 is Electronic Spark Control. This can be due to timing being off. When setting the timing you need to disconnect the tan/black wire. If that doesn't fix it then the Engine Control Module or Prom could be at fault.
knock sensor
knock sensor
Electronic spark control is not receiving sinal from knock sensor Try replacing knock sensor