need some help with some codes/Blazer
 

Will keep brief..
93 chevy S-10 Blazer
Blazer will crank but wont fire up
heres the codes
15
23
34

Thanks in advance for info

RE: need some help with some codes/Blazer
 

[align=left]15 - Engine Coolant Temperature (ECT) Sensor Circuit (Low Temp.)
[/align][align=left]
[/align]23 - Intake Air Temperature (IAT) Sensor Circuit (Low Temp.)

34 - Manifold Absolute Pressure (MAP) Sensor Circuit (Low Sig.)

Looks like there is something wrong with the wiring... Have you recently done some work where you unhooked these sensors?

RE: need some help with some codes/Blazer
 

yes I replaced the radiator.
At the time my temp guage inside the truck did not work.
So I installed a coolant temp sensor in place of the sensor that is facing towards you.
(someone told me to do this but it might be wrong)

Could this be the reason it wont start or more likely the MAP sensor?

RE: need some help with some codes/Blazer
 

OK, well I replaced the MAP sensor and its still not starting/running properly.
I unplugged the battery before installing the MAP sensor and now there are no error codes.

Could someone please explain in detail all the TEMP sensors (just for coolant gauges, engineto ecm, ect.), there location, and the actual technical name for them to order from Autozone?Im a bit confused.

RE: need some help with some codes/Blazer
 

Your coolant temp switch for the gauge is in the pass cylinder head between the spark plugs, and the coolant temp sensor is the one in the intake manifold near the t-stat.

RE: need some help with some codes/Blazer
 

Thanks Kordog. Thats what I thought.
Now when I installed the coolant temp sensor, it dropped down into a tight puzzle piece size hole and I had to fish it out. I'm reading this sensor is important for the ecm to send the right fuel/air ratio for starting. Is this a possibility why it wont start? Is the internal parts of the sensor so delicate that just dropping it 12 inches could damage it and cause my no start?