Where is the quad driver module on a 1989 Buick 3800?

There's no "quad driver module" in the traditional sense on a 1989 Buick 3800 (or any other car from that era). The term "quad driver" usually refers to a component found in some later electronic fuel injection (EFI) systems, often associated with controlling individual injectors. The 1989 3800 likely used a Throttle Body Injection (TBI) system or a relatively simpler multi-port fuel injection (MPFI) system that didn't employ a separate "quad driver" module.

Instead of a quad driver, the 1989 Buick 3800's fuel injection system would be controlled by the engine control module (ECM), also sometimes called the powertrain control module (PCM). This is the main computer that manages various engine functions, including fuel delivery. The ECM is usually located somewhere under the hood, often near the firewall or tucked away in a less accessible spot. Its exact location might vary slightly depending on the specific model and options.

To find it, you'll need to consult your vehicle's repair manual or use an online resource specific to 1989 Buick 3800 models. Searching for "1989 Buick 3800 ECM location" online will likely yield images and descriptions to help you pinpoint it.