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My car wont start

Tiny
JUAN55
  • MEMBER
  • 1998 NISSAN SENTRA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 121,300 MILES
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
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Wednesday, August 10th, 2011 AT 1:54 AM

11 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
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?
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Wednesday, August 10th, 2011 AT 1:00 PM
Tiny
JUAN55
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  • 6 POSTS
No the distributor does not have any voltage. Well they put the obd2 scanner. And it only said that it was a computer problem.
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Wednesday, August 10th, 2011 AT 4:34 PM
Tiny
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.
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Wednesday, August 10th, 2011 AT 7:42 PM
Tiny
JUAN55
  • MEMBER
  • 6 POSTS
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.
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Wednesday, August 10th, 2011 AT 7:57 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Attach a fuse to a wire and attach one end to battery voltage and use the other to probe the Black/White wire.
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Wednesday, August 10th, 2011 AT 8:22 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You are using an external source of power supply to the Black/White wire as explained above
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Wednesday, August 10th, 2011 AT 8:42 PM
Tiny
JUAN55
  • MEMBER
  • 6 POSTS
Ok thank ill try that when I get home and let u know thank you
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Wednesday, August 10th, 2011 AT 9:36 PM
Tiny
JUAN55
  • MEMBER
  • 6 POSTS
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?
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Thursday, August 11th, 2011 AT 3:06 AM
Tiny
KHLOW2008
  • MECHANIC
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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.
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Thursday, August 11th, 2011 AT 12:34 PM
Tiny
JUAN55
  • MEMBER
  • 6 POSTS
Ok so the disconnected cable would be in between the fuse going to the injectors?
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Thursday, August 11th, 2011 AT 2:30 PM
Tiny
KHLOW2008
  • MECHANIC
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Yes if the above is true. It should be more than one wire not being connected.
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Friday, August 12th, 2011 AT 12:17 AM

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