ODES UTV Desertcross 1000cc-3, Maintenance Manual

Page: 228 / 230

11. TROUBLESHOOTING
11-
12
Symptom: ENGINE BACKFIRES
1. Check spark plugs.

Carbon accumulation caused by defective spark plugs. Replace spark plugs.
2. Check leakage on intake manifold.

Air leak on intake system.
Retighten screws and/or replace intake manifold gasket.
3. Check exhaust air leaking.

Exhaust gasket is leaking.
Retighten screws and/or replace exhaust gasket.
4. Check intake valve(s) for leaking.

Intake valve(s) is (are) leaking. Repair or replace valve(s).
5. Check if fuel supply is sufficient.

Fuel line is contaminated and/or bent (engine gets lean).
Clean and/or replace defective part(s).
6. Check engine ground.

Poor engine ground. Clean.
Symptom: ENGINE DOES NOT OFFER MAXIMUM POWER AND/OR DOES NOT REACH
MAXIMUM OPERATING RPM
1. Check spark plugs condition and/or gap.

Fouled spark plugs or wrong spark plug gap.
Readjust gap and clean spark plugs or replace.
2. Check spark plugs type.

Improper spark plugs heat range.
Install recommended spark plugs (refer to TECHNICAL SPECIFICATIONS).
3. Perform engine leak test.

Damaged head gasket and/or seal and/or leaking intake/exhaust valve(s).
replace and/or repair defective parts.
4. Check for water in fuel (wrong fuel).

There is water in fuel or wrong fuel. Drain fuel system, search for leakage and
refill it with appropriate fuel.
5. Check engine compression.

Worn piston(s) and/or piston ring(s). Replace defective part(s).
6. Check fuel pressure.

Low fuel pressure. Perform fuel pressure test (refer to FUEL SYSTEM).
7. Check air intake system.

Air filter is clogged due to contamination. Replace air filter.
8. Check if EMS (engine management system) is in limp home mode.
Check fault codes in DELPHI EFI system.

Check if electrical actuator(s) is/are defective. Replace defective part(s).
9. Check drive belt.

Worn. Replace belt if its width is less than specified.