OBD-I to OBD-II Conversion

[BSarte]

Ok, I tried asking last week about converting my '95 Suburban K-1500 to a '98 K-1500 Vortech and got very little response and the one I got lead me nowhere.

Lets try a little more generic question. Does anybody have info on the difference between the OBD-I & OBD-II systems? I am trying to compare the differences between them so I will know what to expect to try a conversion on my '95 Suburban.

Bruce

[84fiero123]

gmtech probably knows a lot more about them than me but heres what i know;
ob1; you can get codes without a reader
ob2; you need a $300 reader
ob1; controls more less engine systems
ob2; controls more engine systems

[bad68chev]

OBD II was designed to turn an ses light on whenever there is a malfunction that will cause an increase in emmissions, so basically if your SES light is off, your car will pass emmissions. It monitors alot more functions than OBD I. For example, on an OBD I system there is one o2 sensor that tells the computer if the engine is running rich or lean. On an OBD II system, there can be as many as four. One for left bank, one for right bank to tell if engine is running rich or lean. There is also one or two after the catalytic convertor (One for single exhaust, 2 for dual). These tell the computer if the catalytic convertors are working or not. OBD II system will have more sensors than an OBD I. Converting from OBD I to OBD II would require replacing ECM, Wire Harness, and adding any neccessary sensors such as the downstream o2 sensors. Hope this helps!