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On scanner it pulls up water temperature control sensor

Tiny
JAMESDUPE
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • 7.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 115,000 MILES
Changed sensor twice. Runs at about 120 degrees. Backfires when stomped and it seems like it misses at every time transmission shifts. Also, changed fuel filter, spark plugs, wires, rotor and distributor cap.
Tuesday, April 3rd, 2018 AT 5:15 AM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,476 POSTS
Have you verified that the thermostat is actually operating? Also, check over all the vacuum lines for leaks. It sounds like you may have a sticky EGR valve as well.
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Tuesday, April 3rd, 2018 AT 12:51 PM
Tiny
JAMESDUPE
  • MEMBER
  • 1 POST
I have not checked it (thermostat) if there is one. I do not know where all vacuum lines are.
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Tuesday, April 3rd, 2018 AT 10:22 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,476 POSTS
The thermostat range on that engine is 188 - 205 degrees F. 120 is way low. A stuck open thermostat would cause it to run cold.

Should be a sticker showing the vacuum lines. This is the base diagram for that engine.
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Tuesday, April 3rd, 2018 AT 11:51 PM

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