Review on Efficiently Functional: Delphi EG10099 EGR Valve for Optimal Performance by Aaron Ali

This is a well built valve but further investigation shows it is a relief valve which will not fit most GM 87-95 TBI trucks that use "vacuum " were delivered. Cars often used the positive type. Before I discovered this, the truck ran worse after installing Delphi, confusing me. I disconnected the EGR vacuum hose and it was working fine again, hence the investigation as to why. Although the Delphi catalog shows this # is correct, ACDelco shows two different types for my 1988 Suburban so I returned Delphi and ordered the correct A/C.