Adjusting SAS screw on GDI throttle body
Posted: Mon Nov 18, 2013 7:36 pm
I've been struggling with mechanics in Tanzania to fix a high idle, then later stalling engine, on my 1999 3.5 GDI SWB. It's a long story, but I do have one specific question:
Despite the shop manuals clearly stating (in bold) to never adjust the fixed SAS - which I assume to be the Speed Adjustment Screw - on the throttle body since it is factory adjusted, that is exactly what these guys have done (in addition to fiddling with anything else they could find). This screw is the star screw with a locking nut on the underside of the throttle body. Is there a procedure for resetting this SAS to the factory setting, or is it a trial-and-error adjustment?
This may or may not be the root cause of the high idle and stalling (when put into reverse/drive), but I imagine it cannot help and would think it should at least be returned to the factory setting, if possible. Then can continue with other diagnostics/troubleshooting....
Grateful for any help!
Despite the shop manuals clearly stating (in bold) to never adjust the fixed SAS - which I assume to be the Speed Adjustment Screw - on the throttle body since it is factory adjusted, that is exactly what these guys have done (in addition to fiddling with anything else they could find). This screw is the star screw with a locking nut on the underside of the throttle body. Is there a procedure for resetting this SAS to the factory setting, or is it a trial-and-error adjustment?
This may or may not be the root cause of the high idle and stalling (when put into reverse/drive), but I imagine it cannot help and would think it should at least be returned to the factory setting, if possible. Then can continue with other diagnostics/troubleshooting....
Grateful for any help!