Question about 1994 Chevrolet S-10 Blazer

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Wont crank unless u spray starter fluid in. Cleaned air flow sensors. runs fine as long as u hold down the gas. No idling.

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Check The Fuel Filter And Your Fuel Pump Its The Problem %99 Of The Time.
Sincerely,
Michael Scott

Posted on Jul 24, 2009

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If you have the 4.3L 'W' motor then it's time to check fuel pressure at the schrader valve using a gauge. These motors have a CPI injection system that NEEDS EVERY BIT of 62-65 PSI just to start...and 54-60 PSI to run. Anything under 62-65 PSI during cranking...replace fuel pump.

Posted on Jul 28, 2009

  • matt smolinski
    matt smolinski Mar 14, 2015

    Ok yes that makes sense to me. I' ll check it. Thank you.

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THE TOP IS THE IDLE AIR CONTROL VALVE THE BOTTOM IS THE THROTTLE POSITION SENSOR ONE OTHER THING HERE THIS IS ALSO POSSIBLE DO YOU HAVE GAS AND IS THERE GAS COMING INTO THE THROTTLE BODY SPRAY SOME STARTER FLUID INTO THE THROTTLE BODY OPENING WHILE CRANKING THE ENGINE WHEN IT STARTS KEEP SPRAYING IT IF THE CAR KEEPS RUNNING THE FUEL PUMP OR FUEL PUMP RELAY WENT I'm NOT THERE I NEED AS MUCH INFO AS I CAN GET TO TRY TO HELP YOU WITH THIS SO YOU MUST BE SPECIFIC AS TO WHAT WAS DONE OR IS HAPPENING STEPHEN

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Mass air flow sensor location and diagnos


Look at the oxygen sensor. If the map was bad you'd get a overheated catalytic converter.

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I have a 90 silverado 5.7 an it just started to idle very high then low cutting out popping an dying on me. I noticed it will start an run fine until it gets to operating temp. Then it acts like sumone us...


Have you tried cleaning the MAF sensor. This sensor is by the air filter box. The mass air flow sensor has to be cleaned with a special spray that you can get at any auto parts store. Do not, I repeat do not use carb cleaner this will ruin it. It is basically a thin filament housed in a grid where the air flow goes through and if it gets coated by dust, oil, or burning to rich black soot this will throw the signal off just enough at the computer.

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This should be a drive by wire vehicle meaning it has a cable for the throttle body. First thing would be to see if any error codes can be pulled up (most parts stores will do that for free.) Drive by wire versus the late model that use electronic control for the idle have a IAC or idle air control which when first started controls the idle air intake--all air is run by it to idle the vehicle when cold--

Usual symptoms are rather high idle when cold engine or even idle and RPM jumping up and down and stalling when cold.

Another way if idle does drop when cold is tapping the gas--engine will still run until hot. Means not usually a fuel pump issue.

You could also have if the vehicle is fuel injected a dirty Mass air flow sensor, a throttle position sensor, etc.

These can be if the vehicle has them cleaned using a special zero residue spray cleaner.

First have it scanned to see what if any errors it shows--the computer.

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