Appendix A Troubleshooting Guide - Nos 02125NOS Owner's Manual

Appendix A Troubleshooting Guide

The troubleshooting chart on the following pages should help determine and rectify most problems with your installed NOS system. If
you still need assistance determining or fixing problems, call NOS Technical Support Department at 1-866-464-6553.
PROBLEM
No change in engine
speed when the system
is activated.
Engine runs rich when
system is activated.
No change in
performance when
system is activated.
Engine detonates mildly
when system is activated.
18
POSSIBLE CAUSES
System wired incorrectly.
Restricted fuel line.
Malfunctioning fuel
solenoid.
Malfunctioning nitrous
solenoid.
Bottle valve not fully
opened.
Bottle mounted
improperly.
Plugged nitrous filter.
Low bottle pressure.
Inadequate nitrous
supply.
Mismatched N O/fuel
2
jetting.
Excessive fuel pressure.
Loose nitrous solenoid
wiring.
Malfunctioning nitrous
solenoid.
System wired incorrectly.
Loose ground wire(s).
No power to arming
switch.
Damaged fuse in
switched power (15 amp)
Damaged fuse in
solenoid relay battery
power (30 amp)
Malfunctioning arming
switch.
Malfunctioning
Progressive Controller
Overly rich fuel condition.
Inadequate octane fuel.
Incorrect spark plug type
or heat range.
DIAGNOSTIC PROCEDURE
Compare wiring to schematic.
Inspect fuel line for restrictions (crimped
or plugged).
Remove and inspect solenoid.
Remove and inspect solenoid.
Check bottle valve.
Check bottle orientation.
Inspect filter.
Check bottle temperature.
Weigh bottle.
Compare jetting to recommended values.
Install fuel pressure gauge in the fuel line.
Measure the pressure during acceleration,
with the system activated.
Inspect the solenoid wiring.
WARNING: Solenoid discharges nitrous
at a high rate. Don't inhale nitrous; death
may occur. Skin contact may cause
frostbite. Close bottle valve. Disconnect
the solenoid outlet port. Disconnect the
solenoid (+) lead. Open the nitrous bottle
valve. Briefly connect the +12V to the
solenoid. Solenoid should discharge N
at a high rate.
Compare nitrous wiring to schematic.
Connect 12V test light to battery (+)
terminal. Check for continuity at grounds
noted in schematic.
With vehicle ignition on, connect 12V test
light to battery (-) terminal. Check for
power at pole #1 on arming switch.
Remove and inspect 15 amp fuse
Remove and inspect 30 amp fuse
With vehicle ignition on, turn arming
switch ON. Connect 12V test light to
battery (-) terminal. Check for power at
red wire on arming switch.
Refer to the installation instructions for the
NOS Mini 2-Stage Controller, part number
15974NOS
Check for black smoke or backfiring
through exhaust with system activated.
Do not use "fine wire" or iridium type
spark plugs. Reduce spark plug heat
range by 1 or 2 steps.
CORRECTIVE ACTION
Wire per instructions.
Remove restrictions.
Repair/replace solenoid.
Repair/replace solenoid.
Open valve fully.
Mount bottle properly.
Clean/replace filter.
Set bottle temperature to
80° to 85°F.
Fill bottle. 1-800-997-3345
for refills nearest you.
Install correct jets.
Regulate pressure down,
or install smaller fuel
jetting.
Repair wiring.
Repair/replace solenoid.
O
2
Wire system per instr.
Tighten/repair loose
ground(s).
Repair wiring.
Replace Fuse
Replace Fuse
Replace arming switch.
Install smaller fuel jet or
check for restriction in fuel
supply.
Use higher octane fuel; up
to 116VPC-16.
Replace spark plugs with
correct type and heat
range.