ALDL 12-pin USB Cable it will tell you how

it will tell you how many milliseconds (mS) the injector is firing on the LCD readout

ECM555 0707

You have nothing to lose by trying MEFI Scan first

NEW Jumperless ALDL Cable

Several operation and informational tests are also included such as Fuel Pump Relay Test

ALDL 12-pin USB Cable it will tell you howThis cable has a 12 pin OBD1 connector shell to plug in under your cars dash to interface to your cars ECM. This cable is the most convenient to use if your car is equipped with the 12 pin connector style, as it allows you to just feel under the dash to plug it in. See our GM OBD1 home page for references and diagrams of the connectors styles. This cable works on cars that have the serial data pin on pin M or pin E of the GM 12 pin OBD1 ALDL