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Car Died and Now won't start FI fuse Blown
Topic Started: Aug 12 2011, 08:55 AM (5,628 Views)
Switchblade8588
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I was driving home the other day and my car just stopped running going down the road. When I tried to restart the car it would turn over but not start and I could not here the fuel pump running so I figured it was the fuel pump and replaced it but found that the reason the fuel pump was not on is that the FI fuse under the hood was blow so I replaced the fuse but now the car will not start and if it does start it only runs for 1 or 2 secs max before it dies. I had my father under the hood while I was starting the car and he said that its only spraying fuel once and then stopping. Any idea's on what would cause this problem?
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Memphis metro


You might be having fuel relay issues. Have dad turn the switch on and off three or four times but do not start it and hold your hand on the fuel relay and see if you feel it clicking. It is located under the hood in a fuse panel.
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Switchblade8588
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I pull the relay out a little and tested the back with a test light I get two plugs that make it light up and two that don't, also yes I can hear it clicking. Thanks a lot tho I'm really stuck on this one.
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96Geoman


Check the wires going to the fuel injector, some of the insulation could have rubbed off the wire which would cause a short.

If the wires are ok, the next thing to check is the injector.
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Switchblade8588
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Yea I did that yesterday should have said that the fuel pump has power(red and black) also there was a yellow wire with low power which must be the one for the fuel gauge. How would I go about checking/testing the injector? It has pressure up to the throttle body but for some reason is not spray gas more than once every about three times I turn the key and it will start up and shut right back off because it's not getting fuel.
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Switchblade8588
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Ran a + and - to the input on the injector and could hear it doing something but not sure if it's working right or not, could my fuel filter just be plugged, would that explain why it has pressure to the injector but does not keep spraying? maybe it can't keep up? any one know where the fuel filter is on a 1994 geo metro xfi?
Edited by Switchblade8588, Aug 13 2011, 08:01 AM.
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96Geoman


Switchblade8588
Aug 13 2011, 08:00 AM
Ran a + and - to the input on the injector and could hear it doing something but not sure if it's working right or not, could my fuel filter just be plugged, would that explain why it has pressure to the injector but does not keep spraying? maybe it can't keep up? any one know where the fuel filter is on a 1994 geo metro xfi?
http://geometroforum.com/topic/3856194/1/
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Switchblade8588
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Ya thanks that helped I remember seeing it now, I guess I will replace that and see if it helps any.
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Woodie
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It's not your pump or filter. when everything is pumped up and ready to go, it takes a lot more than one pulse to empty out the pressure in the system. If you get one good spray, then no more, either the ECM is not telling the injector to spray because it is not getting feedback from the cam sensor, or the injector itself is not firing every time it gets a pulse.

The injector is supplied with 12V constantly through one wire, the ECM grounds the other wire in pulses to turn the injector on. Put a test light on the injector wires one at a time, with the other test light wire on ground. With the key on, engine off, both should light the light. When it is cranking, one should light the light constantly, the other should make the light blink on and off. If you get this on and off pulse, but you can't see the injector spraying fuel, then the injector itself is bad. If you don't get that pulse, then the ECM is not asking for the injector to fire and you need to research that. Bad computer grounds are often the case, bundle of about four wires that bolt to the back bottom of the intake manifold near the alternator.


Edited by Woodie, Aug 13 2011, 10:59 AM.
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96Geoman


Woodie
Aug 13 2011, 10:58 AM
It's not your pump or filter. when everything is pumped up and ready to go, it takes a lot more than one pulse to empty out the pressure in the system. If you get one good spray, then no more, either the ECM is not telling the injector to spray because it is not getting feedback from the cam sensor, or the injector itself is not firing every time it gets a pulse.

The injector is supplied with 12V constantly through one wire, the ECM grounds the other wire in pulses to turn the injector on. Put a test light on the injector wires one at a time, with the other test light wire on ground. With the key on, engine off, both should light the light. When it is cranking, one should light the light constantly, the other should make the light blink on and off. If you get this on and off pulse, but you can't see the injector spraying fuel, then the injector itself is bad. If you don't get that pulse, then the ECM is not asking for the injector to fire and you need to research that. Bad computer grounds are often the case, bundle of about four wires that bolt to the back bottom of the intake manifold near the alternator.


The fuel pump ground wire also bolts to the back of the intake manifold. If you disconnect the ground wires, the fuel pump will not work.

I would suggest removing the ground wires, clean contacts and reinstall.
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Switchblade8588
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Wow that helps me a lot I was wondering if there was a crack/cam sensor that control the pulse. Thanks alot
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Switchblade8588
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Called advanced auto and checked on rock auto but could not find a crack or cam sensor for a 94 geo metro xfi.
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Johnny Mullet
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Fear the Mullet

I would stop and recheck the wiring for the fuel injector. You might even have to remove it. A dead short is blowing the FI fuse.
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Switchblade8588
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Alright did some more checking I have pulse to the injector I check following the instructions above, also I have pressure to the injector so I'm thinking it has to be the injector not a lot of testing I know how to do with that tho it does have pulse and when starting it I can fell the little pluger on the bottom of the injector moving(pulled of course). So you guys think its the injector? That's what I'm thinking
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Bad Bent
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Click on http://geometroforum.com/topic/2423593/2/ and at post #21 I quote mwebb on how to test injectors, who gives more instructions to Carpet ResQ in the rest of the thread.
Edited by Bad Bent, Aug 13 2011, 05:28 PM.
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