If you disconnect and remove the smog setup on a 95 LT1, will it set codes on the computer? If so, can they be cleared?
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69 Z28 with JL8 factory 4 wheel disc brakes, crossram, transistor ignition, radio delete, heater delete - being restored
70 SS 396 L78 documented, #'s matching
2000 SS Camaro daily beater -
Yes it will set a code. When the command for the AIR pump to turn on is set, the MAP sensor must see a change in pressure to verify the pump did in fact turn on...same goes for the EGR valve opening and closing...
You must reprogram the PCM in order to not set codes..95 Z28, A4, 3.23's and some other stuff.... -
You seem to be confusing the AIR system with the EGR system. It's only the EGR system that blips the MAP pressure when it comes on. AIR only runs for a couple minutes at startup, and there is no connection whatsoever to the intake manifold/MAP.
In the 93-95's with OBD-I, the only diagnostic the PCM runs on the AIR pump is to make sure the power supply circuit is intact. That means you can unplug the AIR pump harness connector, and as long as there is a good fuse in the system, there will not be a code set, or an SES light.
OBD-II (96/97) has sensors to detect actual flow from the AIR pump, so you can't just pull the harness connector off, or you will get a code/light.Fred
381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motorComment
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