Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
So I have an 92 Acura Integra LS, Automatic transmission, 1.8l no vetch, having a no start issue. The fuel pump will not kick on, and the car will not fire , but if you jump in the main relay, and pour some gasoline In the intake it will fire. Only if you run a jumper wire in between though. Unsure of the cause it’s a head scratcher any help would be much appreciated
Turn the key to on & watch the check engine light. The light should come on for approx 2 seconds & then go out. Do you hear the main relay click when the light goes out?
Check I/O's at the main relay & let us know what is missing
Yellow/White - Battery +
Black/Yellow - Battery +
Blue/White - Starter Signal
Black - Ground
Yellow/Black - To Fuel Pump
Green/Black - Ground from ECU
Check all (except starter signal) with key on, in that first 2 seconds when the check engine light is on. Check the starter signal while cranking.