What does this wire do?
 

On my car, the wire is completely melted off with nothing there.

https://i.imgur.com/hKNOxT4.jpg

ACV (air control valve)

ANy symptoms that the wire being severed would do? My car seems to run fine and no lights are on.

It's for emission purposes. If you had an S5 you would likely get an error code.

he has an 87.
the best light he has is a glove box light..lol!

rofl ya so I mean it looks like its attached to a sensor, any advice? This cars wiring was kind of fucked up, someone wired in a radio horrible, ,they had the wrong fuses in etc etc

The ACV has two solenoids, one is the split air and the other is the port air. Use the advanced search feature and type one of the two in followed by hailers and do a search and you'll find out everything you need to know.

god forbid someone doesnt search! how dare i ask someone a question when i know its ACV now

Hailers is the most authoritative member on this site as it pertains to items such as the ACV and its associated components. You were being done a favor by being advised to type in his name after the search heading as it would have reduced the search possibilities immensely. You no like then no like.

I know but I looked and its a mess of threads. I just need to know the name of the circled solenoid. Fuck. Either way I guess I'd prob have to pull it off another rx7. :(

It's either the port air or the split air. The wiring diagram will tell you which. Port has the Black/Red wire and the split has the White wire connected to it (S4). Again, it is for emissions and it should not affect the driveability.

Thank you man, I really appreciate it. Now I have this stupid headlight/running lights shit to deal with but there is a lot of info on it so dont worry i wont make a thread lol:blush:

Headlight- running lights are right up my dark alley so go ahead and continue your search for info right here in this thread.

Well I have this problem that my running lights/dash/reverse lights dont work. When I hit the brakes the brake lights go on though. Also the blinkers work. From what Ive read there is a headlight switch that gets burnt up.

S4 or S5? And make sure the 15 amp illumination fuse (interior fuse box) is good. The reverse lights are related to the back up switch that is part of the tansmission. It has 2 wires. The Black/Yellow has voltage w/key to on. The Red/Green wire then gets power w/the car in reverse.

S4 (87), and yes I checked all the fuses and theyre all good. This thing is kind of a wiring mess tbh. The idiot who had it wired in a radio horribly and an alarm system horribly. SO there are cut wires and shit all over. I'll have to find that reverse light wire, thank you.

If the illumination fuse is good then the White/Green wire at the headlight switch would have constant voltage. W/the switch knob turned to the first position then voltage would be found on the Red/Black and Red/Green wires. The cigarette lighter light is powered by the R/G wire as are the dash lights. If you gain access to the lighter's R/G wire then it should have voltage w/the knob turned to the first position. If it doesn't then the switch is likely the cause. If the lights pop up then the ground wire feeding the switch is not the problem w/the R/G wire not receiving voltage.

The cig lighter works and so does its light. The headlights pop up and work.

The light for the cigarette lighter and the lighter working are independent of each other. With that said, if the light is working then the lights for the turn signal switch, wiper switch and dash lights should work.

Ok sorry, correction, the cig lighter does NOT work. Just the lighter itself.:blush:

ok, so I got the running lights to work, the "shift up"light, the high beams, the highbeams light, the little lights near the knobs that show what they do. The actual dash lights dont work, or the reverse lights. Also the cig lighter doesnt light up. Not to mention the thing in the center with all the lights on it is wacked out and the clock only works if i really press on the plug. The radio was wired in by a hackjob so idk whats up.

The Red/Green wire at the switch harness powers the dash lights. Does it have voltage w/the knob turned to the 1st position? If it doesn't then there is a problem at the switch. Also, make sure the dial within the knob is turned all the way from the dim setting or the dash lights will appear as if they are not on.

The reverse lights are not controlled by the headlight switch. The meter fuse powers the Black/Yellow wire at the reverse switch so make sure it is receiving voltage w/key to on. The switch is connected to the driver's side of the transmission housing. The other wire connected to the switch is Red/Green. If the B/Y has voltage w/key to on and the car is in reverse then the R/G wire should then have power and if it doesn't then the switch is bad. If the R/G wire has power by chance then the reverse light bulbs are problematic or the ground to them is bad.

The meter fuse powers the warning light cluster (via the B/Y wire). Most of all of the lights should turn on w/key to on. Do they? This unit usually has problems due to poor soldering from the factory. If all else fails it might require that the cold solder needs to be resoldered.

I will test it, and let you know. Might be a couple days or so though.