News: New faster testing, no appointment needed, drive in today! (this location only)

To make testing as quick as possible, Nutmeg Auto employs three Certified Testing Inspectors. Mike Gladue, William Libretto and Everard Johnson.

See our very first customer on 10/17/03.

Try Cataclean super injector cleaner, it works! Tufoil Engine Treatment Emissions Repair Tips Emissions Questions Answered. JustAnswer! Type your question here.  letters left Real Car Experts, Real Answers. JustAnswer.Com Note: Engines must be fullly warmed up prior to testing. Testing of a cold engine can result in test failure. CO too high = Car runs rich, burns too much gas. Bad carburetor adjustment, float too high, carburetor flooding, sticking secondary throttle, leaking fuel injector, leaking fuel pressure regulator, feedback system malfunction (oxygen sensor, coolant sensor, throttle position sensor), emissions vapor system malfunction (purge valve, canister clogged) Be aware that NOX will RISE after you fix a CO problem. This must be checked after a successful CO repair. HC too high = unburned fuel in exhaust; car runs very rich or very lean. This is the trickiest condition because there are different causes. If the car is running rich (high CO), the HC can be high also. If the CO is very low and HC is high then the vehicle has a lean misfire. If The CO is high, fix that problem first. If CO is low and HC is high look for engine skipping, misfire due to vacuum leaks, ignition timing set too advanced, ignition misfire problem (plugs, wires, cap), low fuel pressure, carburetor adjusted too lean. If you can’t find a reason for the high HC then perform balance test then compression test to check for engine mechanical problem. NOX too high = NOX forms in normal combustion. NOX too high indicates high combustion chamber temperatures or malfunctioning post-combustion emission controls. CO and HC must be normal before attempting to repair NOX failure. Anything that can create high combustion chamber temperatures will make NOX reading high. Engine overheating, air cleaner hot air door stuck closed, egr vale not functioning, clogged egr valve passage, lean fuel mixture, ignition timing set too high. The two main systems that reduce NOX on a car are the egr system and catalytic converter. If your car is pinging, the NOX will be too high. Pinging is a symptom of high combustion chamber temperature. If all the test readings are just a little too high (slightly high CO, HC, and NOX) it is likely the catalytic converter is damaged or empty. If your converter is supposed to have air injection and it is disabled, the converter will not function properly. The information provided here is a brief guide to help people understand emission failures. It is not intended to be an instruction manual. Please consult manufacturer's diagnostic procedures for your specific vehicle. If you are a technician and feel we have made any error on this list please let me know. Email us.

Official CT Emissions Website

Connecticut DMV

vin number to model year chart — the 10th digit of the vin is the model year indicator