Ignition wiring to Sterring overheating! Electrical tips plz!

ONLY for ADVANCED technical discussion about the 240sx!
Lopin18
Posts: 293
Joined: Thu Mar 01, 2007 2:53 am
Car: '89 Nissan 240SX Hatch KA24E

Post

So hmmm during drift practice the car failed once feeding fuel, it just CUT the fuel off, i Clutched and started it by force, so ok, got home etc.....

When i get home the car shuted himself down 2 times 3rd time didnt even start. blew fuel pump fuse, replaced it and it started but like in 3 Cylinders, pretty rough... towed it home

Next day at home the car started just fine, maintained rpms pretty smooth but started like sputerring very lil (must be the super leaks on my exhaust pipe) but when i tried actually moving the car it moved ok for like 1 min, then it started falling rpms until he died, it was starting but didnt maintain rpms, had to keep rpms high to park him again....

-The ignition wires that connect to the Key assembly have melted (and smoke came from them when i was cranking the car)

- Fuel pump fuse blew

-Ignition wiring to the Fuse box in the engine bay melted too, i separated them all and taped them and still the car is failing

Also i cant EVEN HEAR the fuel pump whirring.... i put the key in on and i dont hear **** from behind the car (well i havent put my ear on the fuel pump directly but i suppose i should be able to hear it from my seat right?)

So i decided to trace down the short and replace the damn wires, i read i can disconnect the ground terminal and start pulling fuses and checking the test light to find my shorts? got any other tips to trace down my problem?


Second Shadow
Posts: 190
Joined: Sun Jan 26, 2003 3:10 pm
Car: 93' 240sx, s13 blacktop sr20det
Location: Columbia, MO

Post

well, its obvious you have a short to ground in there. the ignition powers the fuel pump, so if its shorted there wont be any power to the pump, which is prob why the car won't run.

in a case like this, power is going from the battery directly to ground, and all the wires that complete that circuit are going to have a a crapload of current, hince the melting. which means if you follow the melted wires starting from the battery, at some point your going to run into where there grounded out at and the melting will stop(hince no more current). could be a relay base touching the frame, or all kinds of things, but where the melting stops is going to be your culprate.

I'd check under the hood and by the gas tank(around fuel pump) around your relay and fuse boxes, and around the harness, espcially where it runs close to seams(sharp metal). since you just came back from a drift session, its likey a wire got pulled out of place or part of the harness got shredded on a sharp edge somewhere and is rubbing on the chassey.


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