Honda Civic. Manual — part 317

Fuel lines clogged

Remove restriction

Hesitation

Cracked or broken vacuum

Replace vacuum hoses

hoses

Vacuum leaks

Repair Vacuum leaks

Binding carburetor linkage

Eliminate binding

Binding throttle linkage

Eliminate binding

Binding choke linkage or fast idle cam

Eliminate binding

Improper float setting

Readjust float setting,

see FUEL

Cracked or broken ignition wires

Replace ignition wires

Rough Idle, Missing or Stalling

Incorrect curb idle or fast idle speed

Reset idle speed, see

see ENGINE

PERFORMANCE

Incorrect basic timing

Reset ignition timing

see ENGINE

PERFORMANCE

Improper idle mixture adjustment

Reset idle mixture, see

ENGINE

PERFORMANCE

Improper feedback system operation

Check feedback

system see ENGINE

PERFORMANCE

Incorrect spark plug gap

Reset spark plug gap,

see ENGINE

PERFORMANCE

Moisture in ignition components

Dry components

Loose or broken ignition wires

Replace ignition wires

Damaged distributor cap or or rotor

Replace distributor cap

or rotor

Faulty ignition coil

Replace ignition coil

Fuel filter clogged or worn

Replace fuel filter

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures

Damaged idle mixture screw

Replace idle mixture

screw, see FUEL

Improper fast idle cam adjustment

Reset fast idle cam

adjustment, see

TUNE- see ENGINE

PERFORMANCE

Improper EGR valve operation

Replace EGR valve

Faulty PCV valve air flow

Replace PCV valve

Choke binding or improper choke setting

Reset choke or

eliminate binding

Vacuum leak

Repair vacuum leak

Improper float bowl fuel level

Reset float adjustment,

see FUEL

Clogged air bleed or idle passages

Clean carburetor

passages, see FUEL

Clogged or worn air cleaner filter

Replace air filter

Faulty choke vacuum diaphragm

Replace diaphragm,

see ENGINE

PERFORMANCE

Exhaust manifold heat valve inoperative

Replace heat valve

Improper distributor spark advance

Check distributor

operation

Leaking valves or valve components

Check and repair

valvetrain

Improper carburetor mounting

Remove and remount

carburetor

Excessive play in distributor shaft

Replace distributor

Loose or corroded wiring connections

Repair or replace as

required

Engine Surges

Improper PCV valve airflow

Replace PCV valve

Vacuum leaks

Repair vacuum leaks

Clogged air bleeds

Remove restriction

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures

EGR valve malfunction

Replace EGR valve

Restricted air cleaner filter

Replace air filter

Cracked or broken vacuum hoses

Replace vacuum hoses

Cracked or broken ignition wires

Replace ignition wires

Vacuum advance malfunction

Check unit and replace

as necessary

Defective or fouled spark plugs

Replace spark plugs

Ping or Spark Knock

Incorrect ignition timing

Reset ignition timing

see ENGINE

PERFORMANCE

Distributor centrifugal or vacuum advance
malfunction

Check operation and

replace as necessary

Carburetor setting too lean

Readjust mixture

setting, see ENGINE

PERFORMANCE

Vacuum leak

Eliminate vacuum leak

EGR valve malfunction

Replace EGR valve

Poor Gasoline Mileage

Cracked or broken vacuum

Replace vacuum hoses

hoses

Vacuum leaks

Repair vacuum leaks

Defective ignition wires

Replace wires

Incorrect choke setting

Readjust setting, see

ENGINE

PERFORMANCE

Defective vacuum advance

Replace vacuum

advance

Defective spark plugs

Replace spark plugs

Binding carburetor power piston

Eliminate binding

Dirt in carburetor jets

Clean and/or replace

jets

Incorrect float adjustment

Readjust float setting,

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures

VACUUM PUMP - DIESEL TROUBLE SHOOTING

VACUUM PUMP (DIESEL) TROUBLE SHOOTING CHART

see FUEL

Defective power valve

Replace power valve,

see ENGINE

PERFORMANCE

Incorrect idle speed

Readjust idle speed

Engine Stalls

Improper float level

Readjust float level

Leaking needle valve and seat

Replace needle valve

and seat

Vacuum leaks

Eliminate vacuum

leaks

NOTE:

This is GENERAL information. This article is not intended to
be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles
available in the section(s) you are accessing.

NOTE:

Diesel engines mechanical diagnosis is the same as
gasoline engines for items such as noisy valves, bearings,
pistons, etc. The following trouble shooting covers only
items pertaining to diesel engines.

CONDITION & POSSIBLE CAUSE

CORRECTION

Excessive Noise

Loose pump-to-drive assembly screws

Tighten screws

Loose tube on pump assembly

Tighten tube

Valves not functioning properly

Replace valves

Oil Leakage

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures