My na was miss firing on 3 cyclinder, I was told it were the injectors so I changed them . I also change valve cover gaskets and did the coolant delete. I put it back together now it's just turning over.
One connector came off one of the injectors , how do I know which way to wiring it back up the wires are not the same color , it has new style injectors
91 na won't start
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Chevyboy252
- Posts: 2
- Joined: Mon Sep 12, 2016 9:21 pm
- Car: 95 300zx Na 5 speed
Re: 91 na won't start
Look up the E.C.C.S z32 wiring diagram on google. It has the colors for the wires for each injector (1,2,3,4,5,6) on the top left hand corner. The injector closest to the front is injector #1. Once you determine what color wires go where it doesn't matter how you hook them up. There is no +, - on the injector.
thedude45551 here on the NICO forums explains this very well:
...the injectors are nothing but a solenoid. it doesnt matter the way you wire them up as long as one is positive and one is negative(like a light bulb).
However, it would be good to match the gauges thick to thick, thin to thin. If the gauges do not match then I would just pick an arrangement (as the white/black wire is always negative on the harness for each injector) and stick with it for each injector. I had to do this for my 1992 300zx n/a with the new style injector harness I bought from z1motorsports and it starts up fine.
thedude45551 here on the NICO forums explains this very well:
...the injectors are nothing but a solenoid. it doesnt matter the way you wire them up as long as one is positive and one is negative(like a light bulb).
However, it would be good to match the gauges thick to thick, thin to thin. If the gauges do not match then I would just pick an arrangement (as the white/black wire is always negative on the harness for each injector) and stick with it for each injector. I had to do this for my 1992 300zx n/a with the new style injector harness I bought from z1motorsports and it starts up fine.
Re: 91 na won't start
polarity does matter. but not for that reason. generally in electrical circuits the shorter run or thicker wire is ground. it's a safety thing. also, if a wire needs to run closer to a potential insulation failure point ie. thinner insulation between a conductive body than the other run, it will be the ground. the reason for this can be illustrated by touching the ring of a light bulb that's turned on. completely safe because it's wired to neutral ie. has the potential of ground. assuming it's wired correctly. And because they share a common ground in the ECU it's best to wire it properly for the next guy who needs to test the injector wiring.
do you mean the wires are burnt and brown? or someone's gone and replaced the wiring? either way it's a good idea to go and strip the wrap off the harness until you find the joints and original wiring. I've never seen an auto electrician who can solder. literally every repair i find in a car, the joints are dry soldered, wrapped in electrical tape only and expected to stay apart by shear magic. but hey if it lasts for 3 months, that's good enough. next time make up a story about the alternator or the ECU failing and charge then 10x as much to fix it.
after you shifted the wiring harness it probably broke something. since your connectors broke off it's a good idea to go and replace the wiring and connectors and fill the connectors with bulb grease. you only need to strip it back to where the wiring looks like new but the engines do get very hot so the wiring that runs over the top does break down.
do you mean the wires are burnt and brown? or someone's gone and replaced the wiring? either way it's a good idea to go and strip the wrap off the harness until you find the joints and original wiring. I've never seen an auto electrician who can solder. literally every repair i find in a car, the joints are dry soldered, wrapped in electrical tape only and expected to stay apart by shear magic. but hey if it lasts for 3 months, that's good enough. next time make up a story about the alternator or the ECU failing and charge then 10x as much to fix it.
after you shifted the wiring harness it probably broke something. since your connectors broke off it's a good idea to go and replace the wiring and connectors and fill the connectors with bulb grease. you only need to strip it back to where the wiring looks like new but the engines do get very hot so the wiring that runs over the top does break down.