it will cause pinging running your combustion hotter
A bad EGR valve in a 2000 Saturn can have several symptoms. The EGR valve can cause misfires, the valve can cause vacuum leak style problems. There could also be an engine knock.
Yes, the EGR valve, or port EGR
Worn piston rings and or clogged EGR system and or failed EGR valve
Would this cause the car not to start If the EGR VALVE is bad
Yes
No, the catalytic converter is downstream from the EGR valve so it has no effect on it.
Even a good EGR valve may cause an engine to stall in hot weather.
A faulty or clogged egr valve can cause an engine to run rough. If stuck or clogged the valve can be cleaned after removal with carburetor cleaner.
nope
Stumbles, dies off, low power, poor fuel economy, check engine light
If you have less than 80,000 on it read below. Occasional problems on this vehicle are failures of the Exhaust Gas Recirculation (EGR) Valve Passages and the EGR valve (3.0L V6 engine only). Honda has extended the warranty on problems related to the EGR System to 8 years or 80,000 miles.
That could be cause by a worn out rubber grommet that surrounds the EGR valve. Or possibly the EGR valve may not be pushed in all the way.