• Tiny
  • reefmaster
  • 1986 Chevrolet Astro
  • 6 CYL
  • 2WD
  • automatic
  • 160,500 miles

1986 chevy astro 4.3 tbi runs perfect after temperature is normal operating. Starts and idles when cold but will not accelerate. Replaced temp sensor with new one. Engine floods and gives code 15, high voltage coolant temp. I have installed, new computer, prom, calpack, injectors, pressure relief valve, distributer, module, map sensor, checked vaccum, fuel pressure, replaced coil cap andplug wires. After all of this stillwont run cold

Do you
have the same problem?
Saturday, February 5th, 2011 AT 6:01 PM

1 Reply

  • Tiny
  • JDL
  • Expert
  • 16,289 posts

There are two temp sensors, not sure which one you replaced? The cts has a two wire connector, yellow and black. The computer monitors the voltage on the yellow wire, stone cold about 5 volts. As the engine warms up, the voltage goes down. If a problem with wiring circuit, voltage won't go down. I need to mention the cts and tps share the same ground, a problem on one sensor circuit can cause a problem for the other sensor.

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Saturday, February 5th, 2011 AT 9:29 PM

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