Thinking of cutting the Catalytic Converter's off my 99 GMC Sierra 1500. It has a 350 Vortec in it..
Was wondering if im going to run into any problems doing this (aka make my truck not run)...
Any info would be greatly appreciated.
and yes i know about smog laws and such but we dont have smog checks here in Idaho.. WOOT!
Your going to have to get your PCM Re-flashed to have your engine run 100%. The O2 sensor will throw a code and the lack of back pressure may cause your engine to run leaner which can promote a burnt hole though your valve since the parameter readings from your TPS and and other sensors will not correspond to the values burned in to your stock PCM.
Here are the basic parameters that need to be addressed.
Engine:
-EGR, Air Pump, COT Enable/Disable and controls
-Rev Limiters, Idle Speed and characteristics
-Throttle Follower and Cracker
-MAF Tables, Main VE and Cranking VE
-Power Enrich fuel controls
-Closed Loop/Open Loop characteristics
-Injectors
-Spark Advance and Retard
-Engine Diagnostics
-MAP Error Values
-MAF Error Values
-Misfire Values
-DTC's
Transmission:
-Shift Speeds
-Shift Firmness and Time
-TCC Parameters and Tables
-C.A.G.S.
Transmission Diagnostics:
-Trans Slip Test Conditions
System:
-PRNDL Flag
-Fan Type Select
-VATS
-Fan On/Off Temps
-A/C Parameters
Speedometer:
-Speedometer
-Speed Limiter
If those things above are not adjusted (Dyno tuned) for running your engine with a Cat as it was designed for, you'll notice poor performance and fuel economy as the engine will run on a open loop.
