Nitrous install gone wrong.... need help/advice
Nitrous install gone wrong.... need help/advice mmm... kay... lets start on what has become the most ridiculous install for me... the parts are an NX wet plate kit, FPSS, NX window switch, NX TPS sensing switch... First I had a apparently tapped the wrong wire on the coil pack for the window switch (green wire on drivers side) and the car would run really rough... so I tapped the white #10 wire off the PCM, car drove fine but the AC didn't work, and it wouldn't go into reverse and the tach only worked sporadically. So the following day I continued the install and cut the 2 wires on the window switch to convert it to a 4 cylinder cycle which is what the LS1 reads, and secured PCM back into its position after tapping the white #10 wire. Now the car won't start...
What I know...
I can make the system arm (nitrous system works)
The car tries to start but never turns over (spark plugs are sparking)
The TPS sensor works and reads WOT without the car actually running
All nitrous wires have been checked mulitple times for the correct wiring
I checked to see if there was fuel in the fuels rails and there was (it leaked out of where the FPSS was)
All of the SES, CHECK GAUGES,etc lights work when the key is "on" but car isn't started
what the hell did I do?? This has turned into a 4 day ordeal that I am
over
What I know...
I can make the system arm (nitrous system works)
The car tries to start but never turns over (spark plugs are sparking)
The TPS sensor works and reads WOT without the car actually running
All nitrous wires have been checked mulitple times for the correct wiring
I checked to see if there was fuel in the fuels rails and there was (it leaked out of where the FPSS was)
All of the SES, CHECK GAUGES,etc lights work when the key is "on" but car isn't started
what the hell did I do?? This has turned into a 4 day ordeal that I am
over have you tried starting from scratch on the tach wire? is there a chance where you tapped in the pcm is not receiving the signal, and the WS is robbing it? i bet that would F up the thinking of the pcm.
Originally Posted by 99_Z_155
have you tried starting from scratch on the tach wire? is there a chance where you tapped in the pcm is not receiving the signal, and the WS is robbing it? i bet that would F up the thinking of the pcm.
Not sure were else I could get the signal from? would using a bigger wire to tap the PCM wire lose the signal (because the wire coming off the PCM is very thin and I am using a heavier gauge wire to tap it with?) but even then I don't if that would make the car not start
Originally Posted by 05 GSXR 1XXX
if you cant figure it out sooner or later, just take everything off and see what you messed up or take it to a shop for $$ to get it right.
good luck!
good luck!
Originally Posted by reject
are you saying that it see's 5volts from the TPS? even when the car isnt running?
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
sounds more like you're hooking up the wrong wire on the ws. If you're grounding out the tach signal, the car won't start.
Also, make sure you're one the correct white wire (pin 10) because there are three of them.
To find the problem (assuming that the aforementioned is all ok), take the ws out of the car. (wiring wise, not physically). Then check the system. You don't need to disconnect everything. If the car works ok, and the rest of the n20 system works, then connect JUST the power and tach signal wire to the ws. See if you can get it to trigger without having it activate anything. Once that works, hook up the activation side.
Also, make sure you're one the correct white wire (pin 10) because there are three of them.
To find the problem (assuming that the aforementioned is all ok), take the ws out of the car. (wiring wise, not physically). Then check the system. You don't need to disconnect everything. If the car works ok, and the rest of the n20 system works, then connect JUST the power and tach signal wire to the ws. See if you can get it to trigger without having it activate anything. Once that works, hook up the activation side.
Closed ex-Sponsor Account
iTrader: (1)
Joined: Jul 2004
Posts: 2,797
Likes: 0
From: Wichita Falls, TX
Yellow to FPSS,
FPSS to relay.
Your system see ground throu the window switch. Desconnect that white wire and see what happens. Like Todd157 mentioned.
Another thing, if using a T-TAP for your splices, make sure it did not CUT the wire in half.
NX TPS switch now. car on, you should be connected to the blue wire at the thottle body. And you have to set that switch, it does not come preprogrammed.
Ricky
FPSS to relay.
Your system see ground throu the window switch. Desconnect that white wire and see what happens. Like Todd157 mentioned.
Another thing, if using a T-TAP for your splices, make sure it did not CUT the wire in half.
NX TPS switch now. car on, you should be connected to the blue wire at the thottle body. And you have to set that switch, it does not come preprogrammed.
Ricky
