Question about Chevrolet Blazer

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I have a 1993 chev blazer 4.3l v-6. After setting for a few hours or over night it will not start. When i spray starting fluid in the throttle body it fires right up and continues to run .It will continue to start up and run without starting fluid the rest of the day unles it sets for 3-4 hrs. I have DTC of 33 and 43. I need to know what to do past just a defination of the codes.

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  • loustoy235 Nov 02, 2010

    what about the DTC's

  • loustoy235 Nov 03, 2010

    what about the DTC.s also

  • loustoy235 Nov 05, 2010

    Very good that is the way to answer questions about DTC's

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Trouble Code 33 indicates that the Mass Air Flow (MAF) sensor is reporting more air is entering the engine than makes sense based on RPM and TPS. The MAF sensor produces a frequency output; around 30 Hz at idle to 150 Hz under acceleration. The frequency varies proportionally to airflow. The ECM monitors the frequency and thus determines airflow into the engine. Typical idle MAF is 5 to 7 grams per second.

The conditions for setting this code are:

* no Code 21 or 22 (TPS Error) present, and
* the air flow reported is > 40 grams per second, and
* TPS indicates * the engine speed is 1400 RPM or less, and
* the above conditions exist for over 5 seconds.


Typical causes for this code include:

1) Faulty MAF-to-ECM connection
2) Exceedingly noisy spark plug wires
3) Poor routing of MAF harness (i.e. near coil packs)
4) Maladjusted TPS sensor
5) Defective MAF sensor
6) Defective ECM


Trouble Code 43 indicates that there may be a malfunction in the Electronic Spark Control (ESC) circuit.

ESC is used to sense spark knock (pinging) and ****** the timing to eliminate it. A knock sensor (located at the rear of the engine block) sends signals to an ESC module which then signals the ECM that knocking is being detected. The ECM will ****** the timing by as much as 20 degrees in 1 degree increments. A loss of knock sensor signal or loss of ground at the ESC module will cause the signal at the ECM to remain high. The ECM will act as if no knock is present, and may possibly result in engine damage, if there is detonation.
Loss of the ESC signal to the ECM will cause the ECM to constantly ****** the timing to its maximum. This results in sluggish performance and a Code 43.


The conditions for setting this code are:

  • Engine is running
  • ESC input signal has been low more than 2.23 seconds


Typical causes for this code include:
1) Open or shorted knock sensor
2) Loose knock sensor
3) Excessive mechanical noise within engine
4) Improper or defective ECM
5) Intermittent open in the EST line to the ignition module

Posted on Nov 03, 2010

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Try changing the auto choke temperature sensor ,sorry but as i have never seen one i couldnt tell you where they are other than on the cylinder head

Posted on Nov 02, 2010

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DTC 33:Manifold Absolute Pressure Sensor Circuit (Signal Voltage High - Low Vacuum).
DTC 43:
Knock sensor error
This tells me that the knock sensor is bad and the map sensor is bad. The truck will run with both of these, obviously. But will cause the problems of not starting.

Posted on Nov 03, 2010

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