A rich fuel mixture is definied as being a mixture that is rich in fuel, which would make the engine run cooler. In the presence of a lean fuel mixture the engine will run hotter. This can be easily seen in the use of an oxy acetylene torch. You first set off the fuel alone, then turn on the oxygen. To get the torch to cut through steel you set the acetylene flow back until the flame generates a bright blue cone. A common issue with the use of nitrous oxide is a lean out condition in this same fashion which "torches" a hole through a piston in the same way a common torch does. So in conclusion a rich mixture will run cooler.
The U5 engine option code means California emissions
Lambda sensor measures the exhaust emissions going into and sometimes out of the catalytic converter, this information is relayed back to the ECU where it can decide whether the engine is running properly and adjust accordingly.
on a 350 engine to adjust valves tighten them down with engine running then back them off until it smooths out probably about a quarter of a turn
175HP with the base L48 350 V8 California emissions and high altitudes emissions engine, 185HP with the base L48 350 V8 engine, and 220HP with the optional L82 350 V8 engine.
there is a screw on the carb. be sure to adjust while the engine is running so you can tell by the idle when it is set properly.
Correct the problem. Either the engine is running poorly or you have an improperly functioning catalytic converter or air injection system.
With the engine running, turn the idle screw until you get the speed you want.
NO there is no ADJUSTMENT on the TBI / Throttle body. If the check engine light is on then you need to have the engine scanned with an engine scanner to see what is going on with the emissions system / engine sensers.
The main reason for performing a dyno test on an engine is to make sure the engine is running smoothly after changes have been made. When you adjust things like fuel and air, you still need to make sure the engine is running properly.
A GSR engine swap is legal in the state of California as long as it conforms to the state emissions. The also needs to be domestic and not an import.
I would take that to mean the equipment that cleans up the vehicles emissions is removed from the engine.
if it's a carb. adjust your idle screw out.