immulmen Posted September 19, 2022 Share Posted September 19, 2022 The car had po304 code and fuel in the oil. It has new coil, wires and plugs. I bought 4 cheep eBay injectors and replace #2 and #4 injectors. A fey days later po304 came back so I thought why did I buy cheep injectors. I replaced #4 with another one of the eBay injectors. A few days later #4 was bad again so I replaced #2 and #4 with new Denso injectors. Again po304 a few days later. This time I confirmed a bad injector by swapping #2 and #4 and got po302.The injector ohms at 30. If the top fuel line is supply and the bottom is return #4 is the first to get fuel. It has an in tank fuel filter so I am thinking of adding a fuel filter under the hood. What do you think??? Quote Link to comment Share on other sites More sharing options...
jonathan909 Posted September 19, 2022 Share Posted September 19, 2022 Sure, it's the first in line for fuel, but a tube is a tube and I don't think that's going to make much difference. If the injector in the same position keeps giving you trouble despite trying a bunch of different injectors, I'd be inclined to look at the wiring to that injector. 1 Quote Link to comment Share on other sites More sharing options...
idosubaru Posted September 21, 2022 Share Posted September 21, 2022 On 9/19/2022 at 8:09 AM, immulmen said: The car had po304 code and fuel in the oil. It has new coil, wires and plugs. I bought 4 cheep eBay injectors and replace #2 and #4 injectors. A fey days later po304 came back so I thought why did I buy cheep injectors. I replaced #4 with another one of the eBay injectors. A few days later #4 was bad again so I replaced #2 and #4 with new Denso injectors. Again po304 a few days later. This time I confirmed a bad injector by swapping #2 and #4 and got po302.The injector ohms at 30. If the top fuel line is supply and the bottom is return #4 is the first to get fuel. It has an in tank fuel filter so I am thinking of adding a fuel filter under the hood. What do you think??? You said 30 ohms - how did it compare to the others or did you look up specs? Bad ECU's can cause injectors not to fire, though I haven't heard of them causing one to fail. I'd look up the FSM procedure for testing the circuit. ECU is easily accessible in passengers side footwell under carpet/dash if you need to trace wires from injector to ECU. I don't have it memorized but I don't think injector wiring is too complicated, can probably just test resistance/continuity from one side to ECU and the other to ground. Quote Link to comment Share on other sites More sharing options...
jonathan909 Posted September 21, 2022 Share Posted September 21, 2022 2 hours ago, idosubaru said: You said 30 ohms - how did it compare to the others or did you look up specs? My question as well - the number is meaningless without one from a known-good injector to compare it to. 2 hours ago, idosubaru said: Bad ECU's can cause injectors not to fire, though I haven't heard of them causing one to fail. I was thinking about this. If an ECU output driver is blown (i.e. shorted) and turns on the injector full-time, will exceeding the injector coil's duty cycle burn it out? If one doesn't mind sacrificing a junkbox injector, it could be lashed to a 12V supply (or whatever it's supposed to run at), then wait and see. Quote Link to comment Share on other sites More sharing options...
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