Originally posted by Jonsku
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Engine is stock, except for the lightweight flywheel.
I tried a DME with a stock chip, then put an aftermarket chip in, then tried another DME with the stock chip.
I'll do a compression test.
I have read and cleared the fault codes, many times. Currently only getting a "CAN message" code (CANbus, probably missing AGS signal from auto trans), and "Evap purge valve" code (I don't have the purge valve hooked up).
I'm familiar with the typical backfiring/rumble, but this is a distinct, single, loud "crack" every time I get back on the throttle after lifting off of it for a few seconds. Just one time, every time, from any RPM range.
The main thing is, why does all of this NOT happen with the o2 sensors unplugged? It runs great with them unplugged, just a jerky transition when going on/off throttle.
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