Quote:
Originally Posted by steve99
Hard to work out what going on but
1. Tune is written to ecu flash memory and is not erased or altered if battery flattened or ecu reset or anything else. Then only way to alter or erase a "tune" is to flash in a new one.
2. You will get error codes sometimes if you plug/unplug devices including the OFT, Bluetooth adapters etc. into the cars OBD port (or the cable falls out or is loose or your obd port is worn). This is because the obd port is on the CAN buss which most of the cars control units including the ECU VSC Imobiliser and other units communicate on. Plugging/unplugging devices into the obd port while car is on can momentarily interrupt these communications causing weird stuff to happen and errors codes to be logged and sometimes cause ECU to go into limp home mode.
3. If you reflash or reset ecu with battery removal, or clear error codes with obd scanner this will effectively reset ecu and clear learned parameters such as knock correction table, learned fueling info, throttle and cam position sensor calibration ect, this may make the car feel sluggish or "different" for a few drive cycles. It does not however effect the "tune" stored in the flash memory, just erases the learned parameters in the RAM area of the ecu or other control modules.
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I just changed my battery and let the car idle for 5mins then drove it around. Stopped at store then when I re-started the car and drove around for few mins, I went into WOT with boost 10-11psi where the car sputtered and lost power. I tried it again and same thing. Is this related the ECU reset and learning process?
The car was sitting for a few weeks, but never did this before.