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1987 Fleetwood won't pass DEQ. Excessive Hydrocarbons (too much unburned gas) on drivers side of engine (dual exhaust). It has an exhaust recycling system that I am unfamiliar with. Tubes coming from each cylinder and eventually cycled back through the air cleaner and carb. Can this system fail. What else would cause extremely high HCs. Runs beautifully, fresh tune up and carb rebuild. Ideas?
1987 Fleetwood won't pass DEQ. Excessive Hydrocarbons (too much unburned gas) on drivers side of engine (dual exhaust). It has an exhaust recycling system that I am unfamiliar with. Tubes coming from each cylinder and eventually cycled back through the air cleaner and carb. Can this system fail. What else would cause extremely high HCs. Runs beautifully, fresh tune up and carb rebuild. Ideas?
Your '87 454 should be equipped with two AIR, ("smog") pumps and associated valves, hoses, and tubing. It's this Air Injection Reaction system that you're describing, not the EGR system. Since your rig failed because of excesses HC on only one bank, then it's the AIR system on that bank that's at fault, the hoses going to the air cleaner are only there to provide for "muffling" the air that's "dumped" by the pumps during certain phases of engine operation.If the test printout showed high HC and low or no O2 for that bank, then it's the AIR system for that bank for sure.
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