cdchase32

Anybody have an idea on what could cause my 91 LS400 to start but not run? It is getting fuel, fire, and injection pulse. I was told that a code 52 came up but that wouldn't cause it. The security light is not blinking either. Any advice would be appreciated. Thanks.

dicer

You need to do the fuel pump by pass deal. It is jumpering terminals on the data port.

cdchase32

Do you have any more info, like which pins to jump?

dicer

Open the data port on the engine and inside the cover shows the pin outs. Use something like a bent open paper clip to jump from B+ to the Fp terminal. When the ignition is turned on the fuel pump should run. Its by passing the fuel pump resistor and relay circuits. I suppose in a pinch a car could be driven home doing that. The stiff wire ends of a paper clip work nice to plug into those small terminal plugs.