my '87 F-150 won't start unless i spray gas in intake
My weekend truck with a 302 started acting up one weekend, engine wouldn't idle, engine hunting up and down, and then just got where it wouldn't start. turns over good, but won't start unless I spray gas in the intake. I've cleaned the idle air valve, checked for vacuum leaks, checked fuel pressure and have 45 psi with the engine off. With the engine turning over get about the same pressure. Have power to the injectors, and a slight pulse on the white injector wire with my test light while cranking the engine.
If I spray gas into the throttle body, it cranks, just won't stay running...
After you crank it a bit, pull a plug and see if it smells like gas to make sure the injectors are actually opening. Put some gas on a rag from the schrader valve and then (take it somewhere else) see if the gas on the rag burns. That would tell you something (without spending money anyway).
A Big Thanks to fltdriver for the TPS response. I checked and had a bad TPS, the sensor was open and would not read correct. Purchased a new sensor this afternoon, and am adjusting it now but ran out of daylight. Try again tomorrow afternoon. Thanks again!! Sure hope that solves all my issues. Glad to finally find something that was defective, I hate to just change parts.
I installed a new TPS and set it, and the engine will still only start if I spray gas in the intake. It ran 30 seconds as long as I could keep spraying gas in the throttle body. I have 45 psi of fuel pressure, and not sure where to go next? Is it the injectors, or computer? I used my test light and have power to the injector red wire, and when spinning over the engine, the other wire blinks my test light when the test light is grounded.