i was wondering cause i have a 94 LT1 Z that's been acting up. plugs wires and opti are new. fuel pump is new and filter. my car seems to stumble in the low RPM's and doesn't climb the rpms. it just stumbles pretty good almost wanting to die. i was wondering if my O2's were bad. i deleted the cat about a couple of months ago and put new Bosch O2 sensors. the car ran fine but never ran the way it used to. do you guys think i should replace the Sensors with some better ones? and if i do swtich them with other Sensors would it just do the same thing again what it's doing right now? or should i put a new cat on? see where i live i don't need a cat. the SES light came on once it started acting like this. my brother took it to get scanned at a local dealership. the guy didn't tell him the exact code but told him that the O2's were reading wrong.

 

Have you checked the coil and IC Module? Have you checked the Opti harness for corrosion or bent pins on the connectors at both ends? Have you checked the inlet elbow for a tear, or the bottom edge being off the throttle body? Have you cleaned the MAF sensor?

A scan data log may be one way to try and pin down the issues. That allows you to look at the O2 sensor readings and how they are affecting the long term fuel corrections. Not having a cat should have no affect at all on how the engine runs.

Some people have reported problems using sensors other than the OEM AC/Delco units, particularly with the Bosch sensors.

 

i went with a local friend and he scanned it. he works at a chevy house. it threw these out. DTC 32,36,42. and injuneer i do have a tear in the elbow. would it make that much of a difference?

 

Yes... a leaking intake elbow allows air to bypass the MAF sensor. Screws up the A/F ratio and forces the PCM to try and correct it, using the long term fuel corrections.

http://shbox.com/1/Dtcs.htm

DTC 32 = Exhaust Gas Recirculation (EGR)

DTC 36 = Distributor ignition system (faulty high resolution pulse or extra low resolution pulse detected)

DTC 42 = Ignition Control (IC) circuit (shorted or grounded circuit)

DTC 36 and 42 could contribute to a stumble. DTC 32 probably wouldn't. Did you delete your EGR system?

 

no the egr is still on there. oh and forgot to mention that i deleted the cat and put a strait pipe in place of it. just thought i would let ya'll know.