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| Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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11-25-2012, 03:23 PM
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#1 |
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Join Date: Dec 2010
Location: san jose
Age: 27
Posts: 24
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SR20 #2 injector keeps goin out
Like the title says I'm having this problem with my sr it will run fine on all four cylinders then it will run on 3, injector 2 keeps flooding and white smoke that smelled like raw fuel. Starting doing research possible things would be loan head gasket turbo or injector seal. I checked my rainstorm fluid and oil no sign of oil or antifreeze in either so I replaced the injector and it ran fine then the injector went out again. I did compression check 150 across the board. This lead me to buy a voltmeter so I turn my key to the on position to where the fuel pump goes on I checked each connector and #2 has a constant 12volts and the others have 0.25 or something for example. I changed the ecu to my cousins and still the same damn problem so my harness is killing each injector I put in #2 ! -.-
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11-26-2012, 10:24 PM
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#2 |
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Post Whore!
 
Join Date: Dec 2004
Location: Poconos, PA
Age: 36
Posts: 8,030
Trader Rating: (58)
 Feedback Score: 58 reviews
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I'd be looking into the harness, and or the ECU itself.
You said you swapped your cousin's ECU in...does the car drive with that in? Or same symptoms....
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 Want Air Conditioning in your SR20 Swapped car? Check out www.sr20acbrackets.com for more information! Quest Alternator Conversions for SR20! Check my Group Buy! Tired of lousy internal gates? Go external wastegate with one of my manifolds, Check out my group buy |
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11-26-2012, 10:29 PM
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#3 |
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Join Date: Dec 2010
Location: san jose
Age: 27
Posts: 24
Trader Rating: (0)
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Yeah i drove it around I have even Repinned the ecu plug to work with a j4 ecu and the second injector plug is still a constant 12 volt when I put both leads on the 2 plugs in the clip. The other three have no power. Turns out it still has power when the key is out of the ignition -.- its a wiring specialties harness so I really don't wanna cut it open. Tried two e5 Ecus and one j4
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11-27-2012, 11:45 PM
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#5 |
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Post Whore!
Join Date: Dec 2004
Location: Poconos, PA
Age: 36
Posts: 8,030
Trader Rating: (58)
Feedback Score: 58 reviews
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What pins did you move around? Just the injectors? I'm still a bit confused as you need to make sure ALL pins are correct across the ECU's, not just a few of them.
With that said, the ECU uses a ground signal to fire the injectors, not a power. They should have a consistant power on one side, and then the injector shoots a ground to them in order to make them fire...if you can't find 12v on one pole on each injector, I'd look at your power supply circuit and the relay (such as EGI) boxes. However it could STILL be a bad injector driver in the ECU, which is becomming a more common issue of late...
__________________
Want Air Conditioning in your SR20 Swapped car? Check out www.sr20acbrackets.com for more information! Quest Alternator Conversions for SR20! Check my Group Buy! Tired of lousy internal gates? Go external wastegate with one of my manifolds, Check out my group buy |
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11-28-2012, 12:31 AM
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#6 |
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Post Whore!
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Yeah I'm with Cody. It's probably corrosion on one of the pins for that output for the harness for the injector driver. Check pin #2 for the ECU pin out.
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