Honda Civic. Manual — part 308

See ENGINES

Faulty High Speed Operation

Low fuel pump volume

Replace fuel pump

Leaking valves or worn

Replace valves and/or

springs, See

ENGINES

Incorrect valve timing

Reset valve timing,See

ENGINES

Intake manifold restricted

Remove restriction

Worn distributor shaft

Replace distributor

Faulty Acceleration

Improper fuel pump stroke

Remove pump and

reset pump stroke

Incorrect ignition timing

Reset ignition timing,

See TUNE-UP

Leaking valves

Replace valves, See

ENGINES

Worn fuel pump diaphragm or piston

Replace diaphragm or

piston

Intake Backfire

Improper ignition timing

Reset ignition timing,

See TUNE-UP

Faulty accelerator pump discharge

Replace accelerator

pump

Improper choke operation

Check choke and

adjust as required

Defective EGR valve

Replace EGR valve

Fuel mixture too lean

Reset air/fuel mixture,

See TUNE-UP

Choke valve initial clearance too large

Reset choke valve

initial clearance

Exhaust Backfire

Vacuum leak

Inspect and repair

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures

vacuum system

Faulty vacuum diverter valve

Replace vacuum

diverter valve

Faulty choke operation

Check choke and

adjust as required

Exhaust system leak

repair exhaust system

leak

Engine Detonation

Ignition timing too far advanced

Reset ignition timing,

See TUNE-UP

Faulty ignition system

Check ignition timing,

See TUNE-UP

Spark plugs loose or faulty

Retighten or replace

plugs

Fuel delivery system clogged

Inspect lines, pump

and filter for clog

EGR valve inoperative

Replace EGR valve

PCV system inoperative

Inspect and/or replace

hoses or valve

Vacuum leaks

Check vacuum system

and repair leaks

Excessive combustion chamber deposits

Remove built-up

deposits

Leaking, sticking or broken valves

Inspect and/or replace

valves

External Oil Leakage

Fuel pump improperly seated or worn gasket

Remove pump,

replace gasket and seat

properly

Oil pan gasket broken or pan bent

Straighten pan and

replace gasket

Timing chain cover gasket broken

Replace timing chain

cover gasket

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures

Rear main oil seal worn

Replace rear main oil

seal

Oil pan drain plug not seated properly

Remove and reinstall

drain plug

Camshaft bearing drain hole blocked

Remove restriction

Oil pressure sending switch leaking

Remove and reinstall

sending switch

Excessive Oil Consumption

Worn valve stems or guides

Replace stems or

guides, See ENGINES

Valve "O" ring seals damaged

Replace "O" ring

seals, See ENGINES

Plugged oil drain back holes

Remove restrictions

Improper PCV valve operation

Replace PCV valve

Engine oil level too high

Remove excess oil

Engine oil too thin

Replace thicker oil

Valve stem oil deflectors damaged

Replace oil deflectors

Incorrect piston rings

Replace piston rings,

See ENGINES

Piston ring gaps not staggered

Reinstall piston rings,

See ENGINES

Insufficient piston ring tension

Replace rings, See

ENGINES

Piston ring grooves or oil return

slots clogged Replace

piston rings, See

ENGINES

Piston rings sticking in grooves

Replace piston rings,

See ENGINES

Piston ring grooves excessively worn

Replace piston and

rings, See ENGINES

Compression rings installed upside down

Replace compression

rings correctly, See

ENGINES

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures

Worn or scored cylinder walls

Rebore cylinders or

replace block

Mismatched oil ring expander and rail

Replace oil ring

expander and rail, See

ENGINES

Intake gasket dowels too long

Replace intake gasket

dowels

Excessive main or connecting rod bearing
clearance

Replace main or

connecting rod

bearings, See

ENGINES

No Oil Pressure

Low oil level

Add oil to proper level

Oil pressure sender or gauge broken

Replace sender or

gauge

Oil pump malfunction

Remove and overhaul

oil pump, See

ENGINES

Oil pressure relief valve sticking

Remove and reinstall

valve

Oil pump passages blocked

Overhaul oil pump,

See ENGINES

Oil pickup screen or tube blocked

Remove restriction

Loose oil inlet tube

Tighten oil inlet tube

Loose camshaft bearings

Replace camshaft

bearings, See

ENGINES

Internal leakage at oil passages

Replace block or

cylinder head

Low Oil Pressure

Low engine oil level

Add oil to proper level

Engine oil too thin

Remove and replace

with thicker oil

2008 Honda Civic EX

GENERAL INFORMATION Trouble Shooting - Basic Procedures