1989 460

W

wiebelance1

New member
Hey I gotta question about my 89' Ford that doesn't like to run on its own I'm thinking nice chewed through some wires for the injectors because when we squirt gas into the intake it will run. The fuel rails are getting fuel fuel filter change tps changed. Any ideas??


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you need to check the fuel pressure. just because there is fuel in the rail does not mean that there is enough press to " fire " the injector. your fuel pump could be putting out press. but not enough. you could also have a bad pressure regulator, letting fuel return to the tank and not " fire " the injectors. you really need to check the fuel pressure before you can go any further, other wise you will be just throwing parts at it. there are also fairly inexpensive tools called "noid lights" that you can plug into the connector at each injector to see if each injector is getting the electrical signal for the injector. use it at each injector, this may tell if mice may have chewed through the wiring some place. hope this helps a little .
 
Also make sure the high pressure fuel pump is running when you key it up (turn on ignition, but don't crank it over). You should hear it run for about 3 seconds and then go off, when the engine isn't running. Also check fuel pressure in the fuel rail. Also check fuses/relays.

Sal
 
What's the required fuel pressure in the rail? And I can hear the pump ran when key is turned on


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The fuel pressure with the engine off, the fuel pressure should be about 40 PSI if I remember right. Yes, you can hear the fuel pump run when you turn the ignition on. Not sure if '89 had a high pressure pump in the fuel tank, or under the body (under driver). If it's in the tank you can take the gas cap off and listen when someone turns the key. When running with manifold vacuum on the fuel regulator, the pressure should be around 32 PSI at idle. Less vacuum equals more PSI (max 40).

Sal
 
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