07cobaltguy

Ok, so i have the zex kit, and a MSD window switch.

Im having issues working with the window switch. I narrowed it down to the nitrous solonoid, and the issue only occurs when the power to the solinoid is turned on and the ground is dissconnected or the window switch is connected to the solinoid ground.

when this power is switched on under these conditions it throws the car into power reduced mode, but as soon as i switch the on point on the window switch below the idle speed, or reconnect the regular ground wire, the car returns to normal.

So ive narrowed it down i think (not positive) to the TPS wire on the solinoid throwing a bad signal to the throttle body when the power is switched on with no ground.

I need to figure how to work around this. and fix it. Help me.

Spanky's Monkey

iTrader: (6)

which window switch do you have and are you running the noids on the usually closed end of the msd or the usually open? it needs to be on the usually open end. this means when you hit your rpm window the switch will close completing the circuit.

07cobaltguy

like i said, its not the window switch, i have it working great. but when the nitrous solinoid has the normally open ground offf the window switch hooked up, or the ground not hooked to the solinoid at all, once the arming switch is flipped on, the car goes limp.

maybe i didnt do the right wire on the TB.

has to be the TPS wire thats what i narrowed it down to.

YzRider452

Hey dude i hate to hijack ur thread but how did u wire that window switch up, can u take some pics for me or something?

07cobaltguy

sure give me like 10 mins dude, il go out and take some. I have the msd switch im not sure if that matters but il take some pics, dont mine the mess of wires itll all be cleaned up


what wire on the TB did you tap into

Spanky's Monkey

iTrader: (6)

not trying to be a dick, sorry. what throttle wire are you using and what is the power source for your master (on) switch. what tps are you using? zex i assume.

07cobaltguy

my power source isnt the issue(triple checked, i change power sources) same with the groundings.

I tapped into my purple wire coming off the TB. and yes the zex kit

Thats the Open ground coming off of the window switch hooked to the ground on the solinoid



this is the wire i tapped off of the coil pack for the tach signal



please excuse the crude test fittings.

Spanky's Monkey

iTrader: (6)

when you first programmed the tps did it allow you to go through the whole process or it did it start flashing red-green-off after pressing the program button without touching the throttle?

the ground on the noid should be grounded to the car the yellow wire on the window switch should be wired to the power for the noids. can you supply me with a schematic of exactly how you wired your system?

07cobaltguy

yeah, give me a minute

the nitrous works just fine without the window switch bythe way

Spanky's Monkey

iTrader: (6)

i'm trying to help you get that hooked up you need it.

YzRider452

Yea dude, You DEF need it. Ive been running without a window switch for a couple weeks. Ive sprayed at 1000 rpms twice, lol. Thank god nothin has blown up yet

Spanky's Monkey

iTrader: (6)

whoa, that's bad ****, gotta get that window switch hooked up pronto.

07cobaltguy

so you are saying that i need the yellow to the power wire?

the MSD description of the yellow is as follows: Normally Open. This wire will provide a ground source at your desired On
rpm, and remove the ground at the set Off rpm.

Spanky's Monkey

iTrader: (6)

yeah the msd will power on the zex noid completing the circut and the noids ground should be grounded to the car.

when they state ground source they mean power will flow through. you need a relay between the two points.

YzRider452

That diagram is getting printed RIGHT ******* NOW!!!! lol

07cobaltguy

well fix it for the yellow tho now. since its wrong give me like 5 mins to test it.

the way i had it hooked up originally was the only way that worked. i tried what you had told me and that didnt work.

Spanky's Monkey

iTrader: (6)

i justed checked my system and i read the schematics wrong. my lead from the relay powers the noid the yellow on the msd is indeed the ground.

07cobaltguy

ok so my wiring is good. lol that takes care of that but, that dosent explain the limp mode
its the power thats going into the solenoid with no ground going out the white input like for the tps and freaking the car out? thats the only thing that makes sence?

so now we have to look at my wiring on the TB. what wire did you tap? purple?

YzRider452

Get rid of that tps and get a micro switch. And put it under your gas pedal.

07cobaltguy

yeah, if i had money, and could get it by friday when i go to the track then i would. but i deff will order it when i get my check thurs

YzRider452

Micro switch is like 10 bucks at an auto shop

07cobaltguy

really? well then. advanced auto here i come...

but now how would that be wired in.

oh and im gunning for your spot on the list friday.

YzRider452

Just wire it inline with ur arming switch. Easy as that. What track u going to friday?

07cobaltguy

Great Lakes in union grove. about 5 cobalt going.

wait wait, inline with the arming switch? u mean one side of the switch on the power line, and one side wired to the white tps wire off the solenoid?

YzRider452

Just run it with your main power wire. Why dont you have all those cobalts going to union grove come down to rt 66. We got a bunch of guys going too.