Backfire - Daewoo CIELO EURO III Manual

1F – 380 ENGINE CONTROLS
Definition: Fuel ignites in the intake manifold, or in the
exhaust system, making a loud popping noise.
Step
Were the Important Preliminary Checks performed?
1
1. Inspect for crossed or crossfiring ignition wires.
2. Check the ignition system output voltage for all
cylinders using a spark tester.
2
3. Inspect the spark plugs for excessive wear,
burned electrodes, improper gap, or heavy
deposits.
Is the problem found?
Repair or replace any ignition system components
as needed.
3
Is the repair complete?
1. Check the fuel system operation.
2. Check the fuel injectors by performing an injector
4
balance test.
Is the problem found?
Repair or replace any fuel system components as
needed.
5
Is the repair complete?
1. Inspect the Exhaust Gas Recirculation (EGR)
gasket for a leak or a loose fit.
2. Check the EGR valve for proper operation.
6
3. Inspect the intake manifold and the exhaust
manifold for a casting flash.
Is the problem found?
Repair or replace any components as needed.
7
Is the repair complete?
1. Inspect the timing belt for proper installation and
tension.
2. Check the engine compression.
3. Inspect the intake manifold gasket and the
8
exhaust manifold gasket for leaks.
4. Check for sticking or leaking valves.
5. Repair or replace any components as needed.
Are all checks and corrections complete?

BACKFIRE

Action
Important: Before diagnosing the symptom, check ser-
vice bulletins for updates.
Value(s)
–
Go to Step 2
–
Go to Step 3
–
System OK
–
Go to Step 5
–
System OK
–
Go to Step 7
– System OK
–
System OK
Yes No
Go to
"Important
Preliminary
Checks"
Go to Step 4
–
Go to Step 6
–
Go to Step 8
–
–
DAEWOO T-154 BL2,3