GEORGE'S AUTO REPAIR Inc.

519-842-7058

Monday - Friday  8 AM – 5 PM

 

We are a certified Heavy-Duty Vehicle Drive Clean Emissions Test Centre

 

We are fully certified to test large trucks, buses, and motorhomes with a gross vehicle weeight rating (or gross combined weight rating) of over 4,500kg.

Be Informed

Common Causes of Excessive Exhaust Emissions*

 

The following are only a list of possible causes - a full diagnostic must be preformed in order to determine why a specific vehicle has excess exhaust emissions. Your Vehicle Inspection Report shows the actual levels of hydrocarbons (HC), cabon monoxide (CO) and nitrogen oxides (NOx).

 

High HC during Driving Test or High Idle Test

  • Vacuum leaks
  • Ignition system malfuctions
  • Faulty computerized engine management system and/or oxygen sensor
  • Faulty air injection system
  • Internal Engine problem
  • Failed catalytic converter

 

High CO on Driving Test or High Idle Test (Excessively rich mixture)

  • Carburetor malfunction
  • Dirty air filter, faulty choke or carburetor
  • Faulty computerized engine management system and/or oxygen sensor
  • Faulty fuel injection system
  • Faulty thermostatic air cleaner system
  • Defective evaporative canister purge system
  • Inoperative/missing catalytic converter
  • Faulty air injection system

 

High NOx on Driving Test

  • Inoperative/ineffective exhaust gas recirculation (EGR) system
  • Excessively lean/fuel ratio
  • Malfunctioning or missing catalytic converter (3-way catalyst only)
  • Excessive spark advance
  • Faulty Thermostatic Air Cleaner system
  • Engine deposits or mechanical defect
  • Faulty cooling system

 

High HC at Idle

  • Ignition system malfunction
  • Incorrect air/fuel mixture
  • Vacuum leaks
  • Incorrect ignition timing and/or idle speed
  • EGR valve partially stuck open
  • Faulty fuel injector operation
  • Inturnal engine problem
  • Inoperative/missing catalytic converter
  • Air injection system failure

 

High CO at Idle (Excessively rich mixture)

  • Maladjusted idle mixture
  • Dirty air filter, faulty choke or carburetor
  • Faulty fuel injection system
  • Faulty computerized engine management system and/or oxygen sensor
  • Excessive electric fuel pump pressure
  • Faulty air injection system
  • Inoperative/missing catalytic converter
  • Defective evaporative canister purge system

 

High Opacity (Diesel only)

  • Restricted air intake system/dirty air filter
  • Injectors fouled, leaking or mismatched
  • Injection timing/pump maladjusted
  • Incorrect fuel pump pressure
  • Faulty computerized engine management
  • Engine mechanical defect

 

High HC, CO, NOx on Driving Test

  • Inoperative/missing catalytic converter

 

 

* This list is provided for general information only and is not a substitute for a diagnostic.

 

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