Wiring issue causin funny stumble? wire gurus?

[greencar]

So my stock 92 KA lately has been acting real funny. it idles anywhere from 500-1500rpms and is intermittent, but has been happening more and more. I thought it was a vacuum leak; sprayed everything down with carb cleaner.

No Change...

I moved the wiring harness around, and and the idle dropped significantly. I started to dive into the harness, next to the TPS and found this abomination:



think this may be the cause of my problem? it looks like multiple wires, same color connected to one, is this on oem splice that nissan did or a botched repair job. the wire is black with a silver tracer.

Can anyone help me out please?

[OutToWinPAHC]

Looks like a hack job......

But Nissan uses black with silver for ignition power on a lot. I would cut out that nasty solder job and re solder and heat shrink it and them see if it helps.

[greencar]

I have also looked through wiring diagrams with no available help.

[OutToWinPAHC]

Post more info, Where does the single wire come from. and where is it going to at all points?

[greencar]

Thanks for the help PAHC, i am going to look at this tomorrow and report back, i hate working in the dark..-Dan

[mrgreeneyes]

PAHC is wrong. thats OEM. welcome to Nissan's wiring prowess.

they put a sort of black tar over most of the junctions underhood and then wrap it in tape to seal it from corrosion.

problem is, that s*** heats up, melts JUST a little and wicks into the strands of wire and causes problems.

check your battery ground to chassis, chassis ground to motor, and both your battery terminals. COMMON culprits.

[greencar]

Thanks Mr. Greeneyes

I have new terminals on both poles of the battery and a brand new ground strap for the battery also. I guess I'll clean this crap/ resolder and go from there.

[Hoffman5982]

on both of my s14s I've had the same wiring problem. it would cause it to kind of jerk while driving and sometimes idle so low it would stall when I came to a stop. Both turned out to be the same thing: a break in the harness. A shop found it on my first 240, and I found it on my second one since I pretty much knew what it was. It took a few hours because it was an internal break, so I couldn't tell just by looking at the wire. I dont know if this is helping at all, but I'm just letting you know that it might be a common problem with 240s

[greencar]

Just an update:

Turns out that splice was the culprit, i soldered them back together and this car now drives like a dream again. I also had an intermittant starter relay. All replaced and all is well again, thanks for the help guys!

-Dan