1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, DTS Performance...anyone done mods? in Past Cadillac Vehicle Discussion; From what i understand, in OBD you can change anything the computer controls. Probably differnt for obdII, though............
- 02-19-03 07:06 PM #16
From what i understand, in OBD you can change anything the computer controls.
Probably differnt for obdII, though.........
- 02-20-03 08:21 AM #17
Sorry dude but someone gave you some wrong info.
OBDI, just like OBDII requires special software to manipulate most items. There ARE some items that GM has allowed techs to "play" with but they are mostly driver "convenience" items.
Most anything that directly affects driveability can only be changed with the Tech2 through the use of specific flashes that can be loaded into the PCM by the tech selecting them from a GM database. These flashes are just listed by driveability concern.
Example: Customer says the car feels "flat" after cold start, in VERY cold ambient temps. The tech goes into the database and sees if there is a flash that addresses the issue. If so, he selects it, loads it into the customers PCM and gives the car back. Hopefully this flash "pleases" the customer. In the flash, the GM engineers may have fattened-up the A/F at lower ambient temps, or possibly given slightly more IGN Advance. Sometimes these flashes make the car run noticably better, sometimes not. Sometimes they can have an adverse affect on MPG, or overall performance but they DO correct the issue which prompted the complaint.
- 02-20-03 04:20 PM #18
That clears some things up. But isnt there a way to change anything on the computer, whether it be through a TechII or some sort of other device.