why aren't my injectors working? on 1990 Ford F-350

One day my 460 gas truck just quit running, for no apparent reason. Fuel pump cycles at turn of key, It has spark, it has 45 psi at fuel valve on rail. Noid light on injector plug is dark upon engine cranking. I replaced the EEC and still no good. Please help

by in Firestone, CO on January 26, 2012
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1 answer 3 comments
ANSWER by , January 26, 2012
With the key in run your fuel injector connector should have power on one wire and a ground supplied by the ECM (Engine Control Module) on the other wire while cranking. You need to determine if there is power present, if not then you need to check the power source for the injectors. If you are not getting the ground from the ECM while cranking then you could possibly have an issue with the crankshaft sensor that the PCM uses to "trigger" the injectors. You could also have a wiring issue, ECM issue, security system issue, or another sensor causing a problem.
COMMENT by , January 27, 2012
Is the crankshaft sensor in the distributor? I replaced that yesterday with no luck :(
COMMENT by , January 27, 2012
I hate to see you replacing good parts, more information would be helpful. If you don't have power to the injectors you may just have a faulty relay or possibly something else simple. Yes your crankshaft sensor is part of the distributor assembly.
COMMENT by , July 12, 2013
I'm having this same problem with my 88 460. It was sitting there running and it just quit has any one found out what the problem was?