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No Injector Pulse

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Old Mar 13, 2015 | 06:52 PM
  #1  
evo3matt's Avatar
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No Injector Pulse

Hey guys, looking for some help or directions to go.

I have a 2003 evo 8. Yesterday I was doing an alignment and while backing off the alignment rack, my car died. Tried to restart, however it would only turn over and not start.

Pushed it back into the shop and checked spark. Good. Checked fuel pressure. Good. Checked injector pulse. Nothing. I raised the car into the air and noticed that my rear o2 sensor was bent sideways with red paint on it. Apparently the lip on the alignment rack caught the o2 sensor while backing off.

My fear is that the damage to the o2 sensor may have caused the wires to splice, damaging the aem ems.

I've tried searching for possible fuses to check and have had minimal luck finding an o2 sensor or injector wiring diagram.

Any help with these diagrams or suggestions would be greatly appreciated!

Last edited by evo3matt; Mar 14, 2015 at 08:03 PM.
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Old Mar 14, 2015 | 05:43 PM
  #2  
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Check for blown fuse in engine compartment fuse box. If you find one, replace it. If it blows again on key on, unplug rear O2 under passenger seat and replace fuse again.

Damage to rear O2 will cause this. I can't remember what fuse it is that blows, but if you find more than one blown, you have other issues.
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Old Mar 14, 2015 | 07:57 PM
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Thanks for the reply!

I used a test light to check all the fuses in the under the hood fuse block and in car behind the change holder. All had power on both sides of the fuse with the key on.

I have also already disconnected the o2 sensor.

Any other suggestions would be greatly appreciated!
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Old Mar 16, 2015 | 07:11 AM
  #4  
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Checked crank sensor this morning. 5v signal pulsing while cranking. Looking more and more like a computer issue :/
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Old Mar 16, 2015 | 08:13 AM
  #5  
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Pulled the ems apart. Looks like when the o2 sensor got hit it shorted out the board. Sending out for repair. Hope this helps anyone in the future!
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