How to Locate and Change Out an EGR Valve on a 1997 Blazer


In 1983, Chevrolet launched its first mid-sized SUV with the release of the S-10 Blazer. Until 1995, Chevrolet offered the mid-sized S-10 Blazer and the full-sized Blazer. In 1995, the maker dropped the "S-10" from the mid-sized Blazer and gave the SUV a smoother appearance. The 1997 Blazer had only one engine available, a 4.3-liter V-6 that produced 190 horsepower. An exhaust gas recirculation valve cycled a percentage of the exhaust back into the combustion chamber for re-burning. This re-burning helped keep harmful toxins from entering the atmosphere.

Things You'll Need

  • Ratchet
  • Socket set
  • Plastic gasket scraper
  • EGR valve
  • EGR valve gasket
  • Torque wrench
  • Open the Blazer's hood and look on the engine, between the alternator and the air-conditioning compressor. The cylindrical object at a 45-degree angle to the engine is the EGR valve.

  • Press the locking button on the wiring harness plugging into the top of the EGR valve and pull the harness from the valve.

  • Notate the positioning of the EGR valve prior to removing it. Remove the two EGR valve-to-engine bolts, using a ratchet and socket. Pull the EGR valve from the engine. Pull the EGR gasket from the engine; you may need to scrape it off with a plastic gasket scraper.

  • Set a new EGR valve gasket on the engine, lining up the bolt-holes on the gasket with those on the engine. Set the EGR valve on the engine in the same position as the old one and hand-tighten the EGR valve-to-engine bolts. Torque the EGR valve-to-engine bolts to 7 foot-pounds, and then tighten them to 18 foot-pounds, using a torque wrench and socket.

  • Plug the wiring harness into the receptacle on the new EGR valve.

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