used car Posted January 23, 2013 Share Posted January 23, 2013 !987 gl Backfires when reved up in park.Also hear puffing type sound and uneven exhaust blow out thru tail pipe.What is it? Link to comment Share on other sites More sharing options...
WoodsWagon Posted January 23, 2013 Share Posted January 23, 2013 Carbed or SPFI? If it's carbed it has Air Suction Valves that let air from the filter housing go down pipes into the exhaust. If the reed valves in the ASV's fail, you can get melted bits of plastic in around the air filter and backfiring issues. Exhaust leaks can also lead to backfires in the catalyst, so find out where it's leaking from underneath and fix it. You can also block off the ASV tubes where they connect to the head with a quarter if you are in a non-emmisions test location. Link to comment Share on other sites More sharing options...
used car Posted January 23, 2013 Author Share Posted January 23, 2013 !987 Gl Has 2 barrel carburator non turbo! Link to comment Share on other sites More sharing options...
l75eya Posted January 23, 2013 Share Posted January 23, 2013 Probably an exhaust leak. And a rich condition. Link to comment Share on other sites More sharing options...
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