Please help, trying to get a big cammed 422 LS1 to idle
06-05-2002, 06:42 AM
#22
Re: Please help, trying to get a big cammed 422 LS1 to idle I would not go into the C5 TB and change the stop screw as the PCM will get a bit upset if it can't go below a certain percentage. Only one hole is needed and size will vary depending on tuning and cam. The only time I would think that drilling a hole in it would make it worse if you were not paying attention to the angle percentage and just drilling randomly, especially multiple holes. This needs to be done systematically with a scanner that reads the actual angle percentage and when at operating temps to be done correctly. You also need to let the idle stabilize for a few minutes after each change even at operating temps.
I would think you would end up with a 1/4-9/32" hole by the looks of things, but I would also have Ed lower the desired idle to 950 or so before going any further as the 1200 will be too high in the long run. The hole will end up being too big at that point possibly to get it right for the lower idle speed. Step by step.
Call me if you need to.
Later,
Mike
I would think you would end up with a 1/4-9/32" hole by the looks of things, but I would also have Ed lower the desired idle to 950 or so before going any further as the 1200 will be too high in the long run. The hole will end up being too big at that point possibly to get it right for the lower idle speed. Step by step.
Call me if you need to.
Later,
Mike
