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89 S10 blazer- check engine light

  #1  
Old 12-29-2018, 09:06 AM
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Default 89 S10 blazer- check engine light

Hi everyone,i have a 89 S10 blazer 4.3 with a problem that seems like a bad map sensor.it throws a code 34 but i dont know how to Fix it.code34 is low voltage on map sensor,the check engine light goes on while driving and then i stop the car and restart the engine and the check engine light goes off.i changed map,iac,plugs,cables,tbi.it idles ok but as soon as i put it in Drive after driving for afew minutes its start to stuter.any help!!!!!!!
greetings from the baja
 
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Old 12-30-2018, 05:00 AM
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Threads merged.
 
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Old 12-30-2018, 05:05 AM
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What comes to my mind is that the voltage delivered to the sensor itself is already low.
This can be caused by a multitude of issues with connectors and wiring.

Careful, as normally the voltage to the sensor is only 5V delivered by the ECU.
I would start by measuring the voltage at the connector to the sensor. Then following the wiring from the sensor all the way through the connectors to the ECU.
Inspect all the connectors, wires, clean the contacts/connectors and re-measure voltage at the sensor.

This may require a voltmeter and the ignition "ON".

One would need the correct service and diagnostic manual to do the proper test. Maybe somebody can post the diagnostics page.
 
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Old 01-03-2019, 12:25 PM
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Hello Sergio,

if you got a used rear bench available for me please let me know, I got the same as yours.
Thanks
Don
 
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