Quote:
Originally Posted by secondchance
I believe EGR system was added after 93 model year LT5.
I always thought EGR came into play after cold start and its purpose was to aid in faster warm up in order to control emissions.
A few minutes I was talking to a local mechanic regarding light detonation at light throttle and he was saying that it may be due to clogged EGR valve.
Does EGR come into play after motor has been fully warmed up?
Your thoughts?
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EGR was added in 93. It was planned for the earlier models but was not included, hence the boss on the side of the plenum.
What you are thinking of is the air injection system which helps push air in to the exhaust system to help the cats get up to temp quicker.
EGR only functions while at a cruise.