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Here is one for you Renix Experts out there? I am running a 1987 4.0 Renix.
I hear that if & when the engine is running cold that it runs the engine rich in an open loop mode. I am wondering why they did not set it to run lean until it warmed up all the way to normal operating temperature, to warm the engine and exhaust faster????
Running it leaner, after a brief 60 second rich-fuel warm up would warm the engine up faster, right? It would also warm up the Cat converter sooner with out belching unburned HCO's, right?
I once had one of the very few ever made, Chrysler Lean Burns, made in 1976. It was the last car ever made (so I was told) that came stock with out a cat converter. It passed emmissions tests buy running real lean (which had it's own problems).
Systems with a cat converter run rich as they need the extra unburned fuel to burn in the cat converter, thus heating it up enough to ensure complete combustion of all those nasties in the exhaust.
So I am wondering why they would not run it LEAN at start up, or shortly there after, in the open loop mode since it would heat up the engine, exhaust and cat converter(?) faster. Is it because the excess unburned gas heats up the cat converted faster than a lean burn condition????
This is being asked by someone else who is also dangerously over educated (a Chemical-Env. Eng., but not a combustion or automotive eng.) but still has questions.
Mike McGinness
South Houston, TX
I hear that if & when the engine is running cold that it runs the engine rich in an open loop mode. I am wondering why they did not set it to run lean until it warmed up all the way to normal operating temperature, to warm the engine and exhaust faster????
Running it leaner, after a brief 60 second rich-fuel warm up would warm the engine up faster, right? It would also warm up the Cat converter sooner with out belching unburned HCO's, right?
I once had one of the very few ever made, Chrysler Lean Burns, made in 1976. It was the last car ever made (so I was told) that came stock with out a cat converter. It passed emmissions tests buy running real lean (which had it's own problems).
Systems with a cat converter run rich as they need the extra unburned fuel to burn in the cat converter, thus heating it up enough to ensure complete combustion of all those nasties in the exhaust.
So I am wondering why they would not run it LEAN at start up, or shortly there after, in the open loop mode since it would heat up the engine, exhaust and cat converter(?) faster. Is it because the excess unburned gas heats up the cat converted faster than a lean burn condition????
This is being asked by someone else who is also dangerously over educated (a Chemical-Env. Eng., but not a combustion or automotive eng.) but still has questions.
Mike McGinness
South Houston, TX