2G What would cause this?

[MasterMatt209]

So yesterday I bought an automatic 95 GSX when I picked it up we determined that the 4th injector (when looking at the engine from the front) was not working, it was also running very lean. The drive home was about 3 hours so we get home and I shifted the car into neutral and it just instantly turned the car off so I pull over and start back up and the car runs 10x better the A/F gauge is reading in the middle and the car actually feels like it should but I didn’t go hard on it or anything. So then I decided to unplug the injector to see if it’s working now and it is! But then this morning I fired it up it was running good again, I turn it off and adjust the biss screw because it was tightened all the way in and now the injector isn’t working again. Can anyone help me get this thing running good

 

[techboy]

Follow up question ... how did you determine the 4th injector wasn't working? I'm not saying your not right, it just seems like a tough thing to determine so quickly when you just got the car.

Anyway - it could be a faulty injector - in which case you need to replace the injector. Or, it could be faulty wiring harness feeding the injector. These cars are getting old so the wiring harnesses are getting brittle. Might be as easy of fix as pulling out the soldering iron.

 

[MasterMatt209]

Follow up question ... how did you determine the 4th injector wasn't working? I'm not saying your not right, it just seems like a tough thing to determine so quickly when you just got the car.

Anyway - it could be a faulty injector - in which case you need to replace the injector. Or, it could be faulty wiring harness feeding the injector. These cars are getting old so the wiring harnesses are getting brittle. Might be as easy of fix as pulling out the soldering iron.

Well the guy I bought it from determines it first in front of me by pulling the spark plug wire and the car ran no differently so then he pulled the injector wire and same thing. Then he swapped the spark plugs to make sure it’s not that and determined it was the injector. I did the same thing when the car magically started running nicely and when I pulled the injector wire the car started running poorly until I plugged it back in. But I also have a spark plug wire tester I think I’ll check those too.