Acura RL. Instruction — page 361

No fuel to injection pump

Check fuel delivery system

Fuel filter blocked

Replace fuel filter

Fuel tank filter blocked

Replace fuel tank filter

Fuel pump not operating

Check pump operation and/or

replace pump

Fuel return system blocked

Inspect system and remove

restriction

No voltage to fuel solenoid

Check solenoid and

connections

Incorrect or contaminated fuel

Replace fuel

Incorrect injection pump timing

Re-adjust pump timing, see

FUEL SYSTEMS

Low compression

Check valves, pistons, rings,

see ENGINES

Injection pump malfunction

Inspect and/or replace

injection pump

Engine Starts, Won’t Idle

Incorrect slow idle adjustment

Reset idle adjustment, see

TUNE-UP

Fast idle solenoid malfunctioning

Check solenoid and

connections

Fuel return system blocked

Check system and remove

restrictions

Glow plugs go off too soon

See glow plug diagnosis in

FUEL SYSTEMS

Injection pump timing incorrect

Reset pump timing, see FUEL

SYSTEMS

No fuel to injection pump

Check fuel delivery system

Incorrect or contaminated fuel

Replace fuel

Low compression

Check valves, piston, rings,

see ENGINES

Injection pump malfunction

Replace injection pump, see

FUEL SYSTEMS

Fuel solenoid closes in RUN position

Check solenoid and

connections

Engines Starts/Idles Rough W/out Smoke or Noise

Incorrect slow idle adjustment

Reset slow idle, see TUNE-UP

Injection line fuel leaks

Check lines and connections

Fuel return system blocked

Check lines and connections

Air in fuel system

Bleed air from system

Incorrect or contaminated fuel

Replace fuel

Injector nozzle malfunction

Check nozzles, see FUEL

SYSTEMS

Engines Starts and Idles Rough W/out Smoke or Noise, But Clears After Warm-Up

Injection pump timing incorrect

Reset pump timing, see FUEL

SYSTEMS

2007 Acura RL

GENERAL INFORMATION Trouble Shooting — Basic Procedures

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© 2005 Mitchell Repair Information Company, LLC.

Engine not fully broken in

Put more miles on engine

Air in system

Bleed air from system

Injector nozzle malfunction

Check nozzles, see FUEL

SYSTEMS

Engine Idles Correctly, Misfires Above Idle

Blocked fuel filter

Replace fuel filter

Injection pump timing incorrect

Reset pump timing, see FUEL

SYSTEMS

Incorrect or contaminated fuel

Replace fuel

Engine Won’t Return To Idle

Fast idle adjustment incorrect

Reset fast idle, see TUNE-UP

Internal injection pump malfunction

Replace injection pump, see

FUEL SYSTEMS

External linkage binding

Check linkage and remove

binding

Fuel Leaks On Ground

Loose or broken fuel line

Check lines and connections

Internal injection pump seal leak

Replace injection pump, see

FUEL SYSTEMS

Cylinder Knocking Noise

Injector nozzles sticking open

Test injectors, see FUEL

SYSTEMS

Very low nozzle opening pressure

Test injectors and/or replace

Loss of Engine Power

Restricted air intake

Remove restriction

EGR valve malfunction

Replace EGR valve

Blocked or damaged exhaust system

Remove restriction and/or

replace components

Blocked fuel tank filter

Replace filter

Restricted fuel filter

Remove restriction and/or

replace filter

Block vent in gas cap

Remove restriction and/or

replace cap

Tank-to-injection pump fuel supply blocked

Check fuel lines and

connections

Blocked fuel return system

Remove restriction

Incorrect or contaminated fuel

Replace fuel

Blocked injector nozzles

Check nozzle for blockage, see

FUEL SYSTEMS

Low compression

Check valves, rings, pistons,

see ENGINES

Loud Engine Noise With Black Smoke

Basic timing incorrect

Reset timing, see FUEL

SYSTEMS

EGR valve malfunction

Replace EGR valve

Internal injection pump malfunction

Replace injection pump, see

2007 Acura RL

GENERAL INFORMATION Trouble Shooting — Basic Procedures

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© 2005 Mitchell Repair Information Company, LLC.

VACUUM PUMP DIAGNOSIS

FUEL INJECTION TROUBLE SHOOTING

BASIC FUEL INJECTION TROUBLE SHOOTING CHART

FUEL SYSTEMS

Incorrect injector pump housing pressure

Check pressure, see FUEL

SYSTEMS

Engine Overheating

Cooling system leaks

Check cooling system and

repair leaks

Belt slipping or damaged

Check tension and/or replace

belt

Thermostat stuck closed

Remove and replace

thermostat, see ENGINE

COOLING

Head gasket leaking

Replace head gasket

Oil Light on at Idle

Low oil pump pressure

Check oil pump operation, see

ENGINES

Oil cooler or line restricted

Remove restriction and/or

replace cooler

Engine Won’t Shut Off

Injector pump fuel solenoid does not return fuel valve to OFF
position

Remove and check solenoid

and replace if needed

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

Loose end plug

Tighten end plug

Bad seal crimp

Remove and re-crimp seal

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.

CONDITION & POSSIBLE CAUSE

CORRECTION

Engine Won’t Start (Cranks Normally)

Cold start valve inoperative

Test valve and circuit

Poor connection;vacuum or wiring

Check vacuum and electrical

connections

2007 Acura RL

GENERAL INFORMATION Trouble Shooting — Basic Procedures

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© 2005 Mitchell Repair Information Company, LLC.

Contaminated fuel

Test fuel for water or alcohol

Defective fuel pump relay or circuit

Test relay and wiring

Battery too low

Charge and test battery

Low fuel pressure

Test pressure regulator and

fuel pump, check for restricted

lines and filters

No distributor reference pulses

Repair ignition system as

necessary

Open coolant temperature sensor circuit

Test sensor and wiring

Shorted W.O.T. switch in T.P.S.

Disconnect W.O.T. switch,

engine should start

Defective ECM

Replace ECM

Fuel tank residual pressure valve leaks

Test for fuel pressure drop

after shut down

Hard Starting

Disconnected hot air tube to air cleaner

Reconnect tube and test

control valve

Defective Idle Air Control (IAC) valve

Test valve operation and

circuit

Shorted, open or misadjusted T.P.S.

Test and adjust or replace

T.P.S.

EGR valve open

Test EGR valve and control

circuit

Poor Oxygen sensor signal

Test for shorted or circuit

Incorrect mixture from PCV system

Test PCV for flow, check

sealing of oil filter cap

Poor High Speed Operation

Low fuel pump volume

Faulty pump or restricted fuel

lines or filters

Poor MAP sensor signal

Test MAP sensor, vacuum

hose and wiring

Poor Oxygen sensor signal

Test for shorted or open

sensor or circuit

Open coolant temperature sensor circuit

Test sensor and wiring

Faulty ignition operation

Check wires for cracks or poor

con- nections, test secondary

voltage with oscilloscope

Contaminated fuel

Test fuel for water or alcohol

Intermittent ECM ground

Test ECM ground connection

for resistance

Restricted air cleaner

Replace air cleaner

Restricted exhaust system

Test for exhaust manifold

back pressure

Poor MAF sensor signal

Check leakage between sensor

and manifold

Poor VSS signal

If tester for ALCL hook-up is

available check that VSS

2007 Acura RL

GENERAL INFORMATION Trouble Shooting — Basic Procedures

me

Friday, June 05, 2009 2:26:48 PM

Page 26

© 2005 Mitchell Repair Information Company, LLC.

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