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
- 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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