1993 Lincoln LS Cranks No Start

1993 LINCOLN LS
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2CARPROSUSER
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Will not start, just cranks and here what I have done so far: good fuel pressure(36psi), good spark on all plugs, timing is correct, no fuel in the cylinders. Only 5.4 Volts on common side wires to all fuel injectors. Is the ECM bad? Or one or more of the injectors are bad? appreciate any suggestions.
Feb 3, 2006 at 1:50 AM
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CHEVY350GUY
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before you put money to an ecm, remove the fuel rail and make sure it is not clogged. it's more common than you might think.
Feb 3, 2006 at 3:47 AM
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2CARPROSUSER
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Thanks, I will let you know how I made out.
Feb 3, 2006 at 5:24 AM
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2CARPROSUSER
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Should it be 12Vdc for these common wires (Yellow) ? I disconnected the connector to the ECM and the reading from these wires are 12Vdc. So, it is not the injectors, is it some kind of short in the ECM?
Feb 3, 2006 at 5:27 AM
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CHEVY350GUY
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im not sure of the voltage but try this. put a long screw driver to your ear and listen to each injector. have someone crank the engine. you should hear each injector clicking. if they do they are fine.
Feb 3, 2006 at 1:46 PM
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2CARPROSUSER
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Thanks, I will let you know how I make out.
Feb 5, 2006 at 9:57 AM
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2CARPROSUSER
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none of the injector fired when the engine was cranking. I replaced ECM and still did not start. I checked the fuel return line and there was plenty of gas coming out. I had 35PSI of fuel pressure between the filter and the injectors. I also replaced the ignition coil and the result was the same, not start. How do I make the injectors fired?
Thanks.
Feb 7, 2006 at 12:07 PM
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2CARPROSUSER
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I checked the trouble code and I got 12 as the number. It is air flow sensor. Does it prevent the engine from starting when I fails? Thanks.
Feb 9, 2006 at 5:17 AM
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CHEVY350GUY
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if the ecm doesn't see any air flow it may shut off the fuel supply. also if the code is not related to this particular problem check crank sensor and cam sensor.they tell the ecm to send the ground pulse to the injectors. you can test this with a noid light plugged in to the injector connector. the light will blink if the signal is being sent. and yes 5v is good at the injectors, this is ecm voltage.
Feb 9, 2006 at 11:45 AM
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2CARPROSUSER
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I replaced the air flow sensor and it still did not start. I will check the injectors with the noid lights and let you know. Thanks.
Feb 9, 2006 at 12:03 PM
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2CARPROSUSER
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chevy350guy, thanks for your suggestions. I found the problem that caused the failure of the injectors. The common wire to all of the injectors was corroded. I fixed the broken wire and worked like a champ. Again thanks for the inputs.
Feb 12, 2006 at 10:52 AM
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Suggested Repair

Repair the corroded or broken common wire feeding all fuel injectors, then confirm the injectors pulse while cranking. Check fuel-rail flow, injector click or noid-light signal, and crank/cam sensor inputs before replacing the ECM.

Conversation Summary

A 1993 vehicle cranked but would not start despite good fuel pressure, spark, and timing, with no fuel reaching the cylinders and about 5.4 volts on the injector common wires. The expert advised checking the fuel rail, listening for injector operation, testing injector pulse with a noid light, and considering airflow, crank, and cam sensor inputs; 5 volts was described as normal ECM voltage. Replacing the ECM, ignition coil, and airflow sensor did not fix it. The owner then found the common injector wire was corroded and broken; repairing that wire restored injector operation and the engine started.

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