my car wont start

1998 NISSAN SENTRA
121,300 MILES • 4 CYL • FWD • AUTOMATIC
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JUAN55
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i bought a nissan sentra 1998 and im having problems with it. it melted one of the spark plugs cable so i changed them all. it still wont start. i had it checked and i had to rebuild the engine because the head was cracked. it still wont start. so i have replace the starter distributor and computer n still nothing i checked the cables for the distributor n it doesn't have any power and there is no sparks either please help. this car is giving me a big head ache n leaving me broke thank you
Aug 10, 2011 at 1:54 AM
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KHLOW2008
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Do you have battery voltage at the Black/White wire of distributor with ignition switch turned on and while cranking?

Did you check for trouble codes?

Aug 10, 2011 at 1:00 PM
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JUAN55
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No the distributor does not have any voltage. Well they put the obd2 scanner. And it only said that it was a computer problem.
Aug 10, 2011 at 4:34 PM
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KHLOW2008
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If the Black/White wire does not have any battery voltage, you have a power supply fault.
Since ECU replacement did not solve the problem, it could be a power source failure to the ECU that triggers the fault.

Have you checked all the fuses and power supply to the ECU?
Try using a fused jumper wire to the ignition coil power source ( Black/White wire and test if you could start the engine.
Aug 10, 2011 at 7:42 PM
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JUAN55
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Yes I have check all the fuses and there all good and there is power to the ECU. How does a fuse jumper work and what is that I haven't heard ou f that can u please explain how it works.
Aug 10, 2011 at 7:57 PM
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KHLOW2008
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Attach a fuse to a wire and attach one end to battery voltage and use the other to probe the Black/White wire.
Aug 10, 2011 at 8:22 PM
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KHLOW2008
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You are using an external source of power supply to the Black/White wire as explained above
Aug 10, 2011 at 8:42 PM
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JUAN55
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Ok thank ill try that when I get home and let u know thank you
Aug 10, 2011 at 9:36 PM
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JUAN55
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Hi its me again I tried what u told me and didt turn on. There is still no power on distributor and no spark sorry I forgot to mention that the injectors have no power either. Do u have any other opinions? How can I double check that ecu is getting power and sending it out?
Aug 11, 2011 at 3:06 AM
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KHLOW2008
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Ok, let us start with the easy one first.

Check fuse # 21 ( 10A ) in fuse block for battery voltage with ignition switch turned on. If voltage is available, disconnect any of the fuel injectors and test the Black/Red wire for battery voltage. If voltage is not available, you have an open in the circuit between the fuse block anf fuel injectors. Check for disconnected wire harness.
Aug 11, 2011 at 12:34 PM
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JUAN55
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Ok so the disconnected cable would be in between the fuse going to the injectors?
Aug 11, 2011 at 2:30 PM
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KHLOW2008
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Yes if the above is true. It should be more than one wire not being connected.
Aug 12, 2011 at 12:17 AM
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