Daewoo MATIZ User Manual

ENGINE CONTROLS 1F–303
DAEWOO M-150 BL2
BACKFIRE
Definition: Fuel ignites in the intake manifold, or in the
exhaust system, making a loud popping noise.
Important: Before diagnosing the symptom, check ser-
vice bulletins for updates.
Step Action Value(s) Yes No
1
Were the Important Preliminary Checks performed?
–
Go to Step 2
Go to
“Important
Preliminary
Checks”
2
1. Inspect for crossed or crossfiring ignition wires.
2. Check the ignition system output voltage for all
cylinders using a spark tester.
3. Inspect the spark plugs for excessive wear,
burned electrodes, improper gap, or heavy
deposits.
Is the problem found?
–
Go to Step 3 Go to Step 4
3
Repair or replace any ignition system components
as needed.
Is the repair complete?
–
System OK
–
4
1. Check the fuel system operation.
2. Check the fuel injectors by performing an injector
diagnosis.
Is the problem found?
–
Go to Step 5 Go to Step 6
5
Repair or replace any fuel system components as
needed.
Is the repair complete?
–
System OK
–
6
1. Inspect the Electric Exhaust Gas Recirculation
(EEGR) gasket for a leak or a loose fit.
2. Check the EEGR valve for proper operation.
3. Inspect the intake manifold and the exhaust
manifold for a casting flash.
Is the problem found?
–
Go to Step 7 Go to Step 8
7
Repair or replace any components as needed.
Is the repair complete?
–
System OK
–
8
1. Inspect the timing belt for proper installation and
tension.
2. Check the engine compression.
3. Inspect the intake manifold gasket and the
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?
–
System OK
–

Daewoo MATIZ Specifications

General

Brand	Daewoo
Model	MATIZ
Category	Automobile
Language	English