15
Appendix A Troubleshooting Guide
The troubleshooting chart on the following pages should help determine and rectify most problems with your installed SNIPER system.
PROBLEM
POSSIBLE CAUSES
DIAGSNIPERTIC PROCEDURE
CORRECTIVE ACTION
No change in engine
speed when the system
is activated.
System wired incorrectly.
Compare wiring to schematic.
Wire per instructions.
Restricted fuel line.
Inspect fuel line for restrictions (crimped
or plugged).
Remove restrictions.
Malfunctioning fuel
solenoid.
Remove and inspect solenoid.
Repair/replace solenoid.
Malfunctioning nitrous
solenoid.
Remove and inspect solenoid.
Repair/replace solenoid.
Engine runs rich when
system is activated.
Bottle valve not fully
opened.
Check bottle valve.
Open valve fully.
Bottle mounted
improperly.
Check bottle orientation.
Mount bottle properly.
Plugged nitrous filter.
Inspect filter.
Clean/replace filter.
Low bottle pressure.
Check bottle temperature.
Set bottle temperature to
80° to 85°F.
Inadequate nitrous
supply.
Weigh bottle.
Fill bottle. 1-800-997-3345
for refills nearest you.
Mismatched N
2
O/fuel
jetting.
Compare jetting to recommended values.
Install correct jets.
Excessive fuel pressure.
Install fuel pressure gauge in the fuel line.
Measure the pressure during acceleration,
with the system activated.
Regulate pressure down,
or install smaller fuel
jetting.
Loose nitrous solenoid
wiring.
Inspect the solenoid wiring.
Repair wiring.
Malfunctioning nitrous
solenoid.
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
2
O
at a high rate.
Repair/replace solenoid.
No change in
performance when
system is activated.
System wired incorrectly.
Compare nitrous wiring to schematic.
Wire system per instr.
Loose ground wire(s).
Connect 12V test light to battery (+)
terminal. Check for continuity at grounds
noted in schematic.
Tighten/repair loose
ground(s).
No power to arming
switch.
With vehicle ignition on, connect 12V test
light to battery (-) terminal. Check for
power at pole #1 on arming switch.
Repair wiring.
Damaged fuse in
switched power (15 amp)
Remove and inspect 15 amp fuse
Replace Fuse
Damaged fuse in
solenoid relay battery
power (30 amp)
Remove and inspect 30 amp fuse
Replace Fuse
Malfunctioning arming
switch.
With vehicle ignition on, turn arming
switch ON. Connect 12V test light to
battery (-) terminal. Check for power at
red wire on arming switch.
Replace arming switch.
Engine detonates mildly
when system is activated.
Overly rich fuel condition.
Check for black smoke or backfiring
through exhaust with system activated.
Install smaller fuel jet or
check for restriction in fuel
supply.
Inadequate octane fuel.
Use higher octane fuel; up
to 116VPC-16.
Incorrect spark plug type
or heat range.
Do not use "fine wire" or iridium type
spark plugs. Reduce spark plug heat
range by 1 or 2 steps.
Replace spark plugs with
correct type and heat
range.
Engine detonates heavily
Too much nitrous flow.
Reduce nitrous jetting.