Bobbyg Posted November 17, 2022 Share Posted November 17, 2022 I am looking for a computer for my 89. Anyone know where to get one? Link to comment Share on other sites More sharing options...
2seater Posted November 17, 2022 Share Posted November 17, 2022 From the title, it sounds like you have a specific problem. What indicates you need a computer (ECM)? We need more detail to be able to offer good suggestions. Do you know how to access the onboard diagnostics? Link to comment Share on other sites More sharing options...
Padgett Posted November 17, 2022 Share Posted November 17, 2022 Actually that is just one of several computers but sounds more like a stuck IAC (common GM acronym is in the front of the service manual). Link to comment Share on other sites More sharing options...
Bobbyg Posted November 19, 2022 Topic Author Share Posted November 19, 2022 All I know is my mechanic indicates a computer problem since he has tried everything else Link to comment Share on other sites More sharing options...
2seater Posted November 19, 2022 Share Posted November 19, 2022 There are many answers and tutorials in the "how to" guides and diagnostics at the top of this page. Key to this is being able to access the onboard systems which is also in the guides. If you can do that, many questions can be answered, right from the comfort of the drivers seat. Link to comment Share on other sites More sharing options...
Padgett Posted November 19, 2022 Share Posted November 19, 2022 "he has tried everything else" that statement alone would scare me. Do either of you have the factory service manual and/or an ALDL scanner ? Link to comment Share on other sites More sharing options...
Ronnie Posted November 19, 2022 Share Posted November 19, 2022 Fast idle has been caused by the TPS several times. And a time or two by the power steering switch on the rack and pinion. Link to comment Share on other sites More sharing options...
Padgett Posted November 19, 2022 Share Posted November 19, 2022 Nice thing about TunerPro RT is the data-logging feature. Can set to log TPS and IAC (most likely problems) plus many other things on an ALDL system and drive until it happens, then review "what".. Can get an ALDL to USB adapter from Moates.Net. There is no substitute for proper instrumentation. Link to comment Share on other sites More sharing options...
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