vortech said:
Just installed the donaldson and wanted to do a relearn to accomadate the extra air flow. On my 98 Z28 LS1 you just pulled the ignition and the pcm fuse for about 10 minutes and that was it. I've heard i need to disconnect the battery for for while like overnight-is this true or is there a simpler way? Thanks
Do nothing. The PCM will automatically adjust the air fuel ratios in all 17 Closed Loop fuel cells. This takes about 100 miles of driving. Pulling the fuses can reset the process, but will not make it happen much faster.
WOT will never reset, since it is OL1 or Open Loop. The A/F ratio is factory preset. There are ways to change the WOT a/f ratio however, they are usually best done by programmers.
One manual learn process is idle. The throttle plate setting for fuel cell 19 and 18 need to be done is this way:
Bring the water temp up to 176 or above. Idle for 5 minutes with A/C off; shut ignition off then for 30 seconds. Fuel cell 19 is set.
Restart and turn A/C on. Same as above: 5 minutes at idle, off for 30 seconds. Fuel Cell 18 is set.
Fuel cells 18 and 19 are closed loop, but will not reset automatically. This same procedure needs to be done if the battery is disconnected or the PCM is reset.
Jim Hall
Halltech
PS If you have any questions, give us a call.
