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Please define "fire power". Is this just the power from the battery swinging the engine, or did you check if there is a healthy spark on the plug wires? If an engine dies without warning, the chances are very good it is the crank angle sensor in which case there will not be any spark on the wires even though the starter will swing the engine quite lustily without starting.
So you know the fuel pump would have nothing to do with the plugs getting spark, right ? You said the coil tested good, is it getting voltage from the key switch and a ground signal from the distributor ?
If you have to force the fuel pump on by the relay who is controling ignition? The fuel pump will come on thru the main relay which is next to the fuel pump relay this controls ignition,go back to the begining,on one of the coil leave a 1/4 between the sparkplugwire and the coil crank the engine there should be spark is there is no spark correct for spark and fuel will return when the ECM see a valid RPM signal.so test for spark first. The Main relay is what needs to be look at
ADVANCE AUTO HAS A MACHINE TO TEST MODULES.. BUT IF I WENT THROUGH THE HASSTLE TO REMOVE IT I WOULD REPLACE IT..YOU ARE DOING WHAT IS CALLED SHOTGUN REPAIR..REPLACING PARTS ON A GUESS..NEED TO FIND OUT WHAT YOU ARE MISSING SPARK,,, FUEL,, COMPRESION...GET BACK WITH ME
Hi , these trucks are notorious for fuel pump issuse. (I have 2 in the shop now).First check for spark if spark is present then we need to check for fuel.if a presure gauge is avail,install the gauge and crank the engine.if presure increases to 50-60 psi fuek is probably not the issue. now if a gauge is not avail you can remove the air cleaner/snorkle assy.spray some carb cleaner in the throttle body,then try to start if (if it starts for a second the problem if fuel.now if it starts go under by the fuel tank,reach up (from the drivers side and unplug the fuel pump plug (4 wire) have some one crank the engine ande check for battery power on gray wire durring cranking,if battery power is present check black wire for good ground.if both power and grounds are present pump is no good.if now power then swap the fuel pump relay w/ same design relay (in the underhood relay center) relays are also a known issue w. the s and t trucks,good luck Thanks
Have you checked that you have power to the coil on cranking?You may also want to check wether you have a good strong spark at the spark plug.It could be an ignition module breaking down.If you have no power to the coil you may need to change the ignition relay.Its close to the battery.
make sure you have pressure to your fuel rail, if you do , then check your timing it could have jumped or be off, make sure you have spark to all four wires. and for the fuses turn your ignition key to on position and get a test light, ground the test light to a good ground and apply the light to both slots of each fuse, if it lights on both sides of the fuse then the fuse is good, if it only lights on one end of the fuse the fuse is probably bad so pull it and look to see if its fried, and if it doesnt light up on either side it is most likely good, thats about all i can think of, hope it helps