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I have a 1989 chevy p/u w/350.will not start.have changed out fuel pump,fuel pump relay,p/u coil, computer ect... getting fuel to injectors but they are not pulsing,I was told it could be the oil pres. sending unit,have not changed, or the map sensor, also have not changed.If it could be the map sensor,where is it located?truck will start by pouring fuel into throttle body, but will only run until fuel is burned.Any sugestions?
Check the injector relay and the injector fuse if they are good you might want to make sure the computer was programed right. and check to see if the injectors are getting a signal from the ecu
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The injectors are mounted in a throttle body.
If you have normal fuel pressure at the injectors, they may not be getting power and ground from the engine computer.
Sounds like maybe the main computer is bad. When you cranked the engine there is not any indication that it is firing. If you have changed the fuel pump and coil and it still wont even fire, the computer is most likely the cause. Even if the timming was off you would still get some indication that it was trying to start although it probably would not if the timming was off, but the fact it's not even trying to fire yeah that's my take.
You need air, fuel, and spark to start your vehicle. It may be the fuel pump, filter, fuel pump fuse/relay. You should be able to hear the fuel pump kick on when you first turn your key. Fuel goes to the pump, filter, lines, and engine. If it is getting gas, you need to check for spark. Spark plugs/coil wires, distributor, dist.cap, cam sensor, ect. It can be anyone of them. Check for gas and spark.
I have a 90 chevy k1500 350 tbi with same problem! I have traced problem to... after turning on key fuel pump kicks on when u crank it over injectors shoot gas and truck starts! After few seconds injectors stop spraying and truck dies! This can happen many times over and over! Eventually sometimes truck stays running and all is great! I changed ignition module, oil pressure sending unit (which i was told controls gas after vehicle is running) fuel filter, computer, fuel pump relay, I am at a loss now! Hope this helps and hope someone can help me!
before you drop tank again, check fuses & relay.then disconnect fuel line @ filter turn key to on position should hear fuel pump run and get gas stream out of line. if no flow from line new pump faulty be sure & remove negative battery cable first good luck.
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