Faulty push rod seat or lifter plunger
Replace plunger or push rod
Noisy Valves
Improper valve lash
Re-adjust valve lash, See
ENGINES
Worn or dirty valve lifters
Clean and/or replace lifters
Worn valve guides
Replace valve guides, See
ENGINES
Excessive valve seat or face run-out
Reface seats or valve face
Worn camshaft lobes
Replace camshaft, See
ENGINES
Loose rocker arm studs
Re-tighten rocker arm studs,
See ENGINES
Bent push rods
Replace push rods, See
ENGINES
Broken valve springs
Replace valve springs, See
ENGINES
Burned,Sticking or Broken Valves
Weak valve springs or warped valves
Replace valves and/or springs,
See ENGINES
Improper lifter clearance
Re-adjust clearance or replace
lifters
Worn guides or improper guide clearance
Replace valve guides, See
ENGINES
Out-of-round valve seats or improper seat width
Re-grind valve seats
Gum deposits on valve stems, seats or guide
Remove deposits
Improper spark timing
Re-adjust spark timing
Broken Pistons/Rings
Undersize pistons
Replace with larger pistons,
See ENGINES
Wrong piston rings
Replace with correct rings,
See ENGINES
Out-of-round cylinder bore
Re-bore cylinder bore
Improper connecting rod alignment
Remove and realign
connecting rods
Excessively worn ring grooves
Replace pistons, See
ENGINES
Improperly assembled piston pins
Re-assemble pin-to-piston,
See ENGINES
Insufficient ring gap clearance
Install new rings, See
ENGINES
Engine overheating
Check cooling system
Incorrect ignition timing
Re-adjust ignition timing, See
TUNE-UP
Excessive Exhaust Noise
Leaks at manifold to head, or to pipe
Replace manifold or pipe
gasket
2007 Acura RL
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ENGINE PERFORMANCE
CARBURETOR TROUBLE SHOOTING:
BASIC COLD START SYMPTOMS TROUBLE SHOOTING CHART
Exhaust manifold cracked or broken
Replace exhaust manifold,
See ENGINES
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
Choke not closing
Check choke operation, see
FUEL SYSTEMS
Choke linkage bent
Check linkage, see FUEL
SYSTEM
Engine Starts, Then Dies
Choke vacuum kick setting too wide
Check setting and adjust see,
FUEL SYSTEMS
Fast idle RPM too low
Reset RPM to specification,
see TUNE-UP
Fast idle cam index incorrect
Reset fast idle cam index, see
FUEL SYSTEMS
Vacuum leak
Inspect vacuum system for
leaks
Low fuel pump outlet
Repair or replace pump, see
FUEL SYSTEMS
Low carburetor fuel level
Check float setting see FUEL
SYSTEM
Engine Quits Under Load
Choke vacuum kick setting incorrect
Reset vacuum kick setting,see
FUEL SYSTEMS
Fast idle cam index incorrect
Reset fast idle cam index, see
FUEL SYSTEM
Incorrect hot fast idle speed RPM
Reset fast idle RPM, see
TUNE-UP
Engine Starts, Runs Up, Then Idles, Slowly With Black Smoke
Choke vacuum kick set too narrow
Reset vacuum kick, see FUEL
SYSTEMS
Fast idle cam index incorrect
Reset fast idle cam index, see
FUEL SYSTEMS
Hot fast idle RPM too low
Reset fast idle RPM, see
2007 Acura RL
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BASIC HOT START SYMPTOMS TROUBLE SHOOTING CHART
BASIC COLD ENGINE DRIVEABILITY SYMPTOMS TROUBLE SHOOTING CHART
BASIC WARM ENGINE DRIVEABILITY SYMPTOMS TROUBLE SHOOTING CHART
TUNE-UP
CONDITION & POSSIBLE CAUSE
CORRECTION
Engine Won’t Start
Engine flooded
Allow fuel to evaporate
CONDITION & POSSIBLE CAUSE
CORRECTION
Engine Stalls in Gear
Choke vacuum kick setting incorrect
Reset choke vacuum kick, see
FUEL SYSTEMS
Fast idle RPM incorrect
Reset fast idle RPM, see
TUNE-UP
Fast idle cam index incorrect
Reset fast idle cam see FUEL
SYSTEMS
Acceleration Sag or Stall
Defective choke control switch
Replace choke control switch
Choke vacuum kick setting incorrect
Reset choke vacuum kick see,
FUEL SYSTEMS
Float level incorrect (too low)
Adjust float level, FUEL
SYSTEMS
Accelerator pump defective
Repair or replace pump see
FUEL SYSTEMS
Secondary throttles not closed
Inspect lockout adjustment,
see FUEL SYSTEMS
Sag or Stall After Warmup
Defective choke control switch
Replace choke control switch,
see FUEL SYSTEMS
Defective accelerator pump
Replace pump, see FUEL
SYSTEMS
Float level incorrect (too low)
Adjust float level, see FUEL
SYSTEMS
Backfiring & Black Smoke
Plugged heat crossover system
Remove restriction
CONDITION & POSSIBLE CAUSE
CORRECTION
Hesitation With Small Amount of Gas Pedal Movement
Vacuum leak
Inspect vacuum lines
Accelerator pump weak or inoperable
Replace pump, see FUEL
SYSTEMS
Float level setting too low
Reset float level, see,FUEL
SYSTEMS
Metering rods sticking or binding
Inspect and/or replace rods,
see FUEL SYSTEMS
2007 Acura RL
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DIESEL ENGINE TROUBLE SHOOTING
BASIC DIESEL ENGINE TROUBLE SHOOTING CHART
Carburetor idle or transfer system plugged
Inspect system and remove
restriction
Frozen or binding heated air inlet
Inspect heated air door for
binding
Hesitation With Heavy Gas Pedal Movement
Defective accelerator pump
Replace pump, see FUEL
SYSTEMS
Metering rod carrier sticking or binding
Remove restriction
Large vacuum leak
Inspect vacuum system and
repair leak
Float level setting too low
Reset float level, see FUEL
SYSTEMS
Defective fuel pump, lines or filter
Inspect pump, lines and filter
Air door setting incorrect
Adjust air door setting, see
FUEL
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
Engine Won’t Crank
Bad battery connections or dead batteries
Check connections and/or
replace batteries
Bad starter connections or bad starter
Check connections and/or
replace starter
Engine Cranks Slowly, Won’t Start
Bad battery connections or dead batteries
Check connections and/or
replace batteries
Engine oil too heavy
Replace engine oil
Engine Cranks Normally, But Will Not Start
Glow plugs not functioning
Check glow plug system, see
FUEL SYSTEMS
Glow plug control not functioning
Check controller, see FUEL
SYSTEMS
Fuel not injected into cylinders
Check fuel injectors, see
FUEL SYSTEMS
2007 Acura RL
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