BAD WIRING HELP!!!

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new_to_drift
Posts: 329
Joined: Tue Jun 22, 2004 7:29 pm
Car: 89 240SX coupe

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So i did a 96 KA swap into my 89 240sx.And i didnt do my wiring,cuz i dont know that much about it,so i had this one guy do it that i use to know.Well he did a ****ty job, and wired the o2 sensor completely wrong.The KA24DE motor is OBD2 and my old 1 is OBD1.So the o2 sensors are completely different.The 96 is a 3 wire,the 89 is a 1 or 2 wire.The problem is that whenever my car is warmed up my car runs like crap,it bogs a lot,so i think that since the o2 sensor is hooked up wrong,its sending a bad signal to the ECU (if its even sending 1) and causing my car to run either way rich or way lean.I think way rich.I do not know what to do, if anything.PLEASE HELP.I am not that good at wiring, if anyone lives in the Michigan area that thinks they could check my wiring and fix this.Let me know asap,and we could work something out.Give suggestions please.thanks


NISTECH
Posts: 10585
Joined: Sun May 25, 2003 4:17 am

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unplug the o2 and see if it makes a difference. If it doesnt its likely not the o2 causing it and most likely the coolant temp sensor/signal or the Maf sensor/signal. O2's dont generally have that much of an effect on drivability only on slight fuel mixture control.

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new_to_drift
Posts: 329
Joined: Tue Jun 22, 2004 7:29 pm
Car: 89 240SX coupe

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i did unplug it and it still felt the same.how can i check the maf if i cant check the codes?my ecu is not throwin any codes.

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new_to_drift
Posts: 329
Joined: Tue Jun 22, 2004 7:29 pm
Car: 89 240SX coupe

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also i just replaced both of the coolant temp sensors.

NISTECH
Posts: 10585
Joined: Sun May 25, 2003 4:17 am

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new_to_drift wrote:also i just replaced both of the coolant temp sensors.
But how do the connectors look? do they have corrosion in them? do they fit snug on the terminals in the sensor? Only the 2 wire sensor on your intake is the one you need to be concerned with. the single wire is just for your gauge.

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new_to_drift
Posts: 329
Joined: Tue Jun 22, 2004 7:29 pm
Car: 89 240SX coupe

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the connector looks pretty corroded.But i dont want to go spend like 50$ on a new o2 sensor if its not even wired right.

NISTECH
Posts: 10585
Joined: Sun May 25, 2003 4:17 am

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I am reffering to the Coolant temp sensor connectors. If they are corroded you can just clean them with battery terminal cleaner or baking soda and water mix. Use a pocket screw driver to scrape them clean. then slightly bend in the female terminals a little so they fit tight on the male terminals in the sensor.

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new_to_drift
Posts: 329
Joined: Tue Jun 22, 2004 7:29 pm
Car: 89 240SX coupe

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where is the coolant temp sensor located?cuz i did replace 2 water temp sensors which are located on the front of the engine close to the intake manifold.

NISTECH
Posts: 10585
Joined: Sun May 25, 2003 4:17 am

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The "water temp" sensors you replaced , one of them is a 2 wire sensor. Check its connector for corrosion.


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