IDLING OF DIESEL AND GASOLINE VEHICLES

Besides excessive smoke, HDDVs are also subject to an idling standard. While there are several exemptions to the rule, under most common circumstances, HDDV engines are not allowed to idle for more than three minutes. This applies to both gasoline and diesel vehicles.

Read the Diesel Idling Regulations, N.J.A.C. 7:27-14

Read the Gasoline/Car Idling Regulation, N.J.A.C. 7:27-15

Check out Idling Information and Outreach Materials

 

Excessive black smoke is frequently caused by an overly rich fuel mixture that does not combust completely, creating soot. It may also be caused by clogged air or fuel filters; clogged or worn fuel injectors; lack of maintenance; or other engine defects, indicating the need for repairs.

Idling does more than create unnecessary emissions, it wastes fuel too - typically one gallon per hour, or more. For maintenance and fuel saving tips, visit NJ Inspections' Driving Green, Saving Green and Saving Gas and Money.

 

Smoke from Diesel-Fueled Motor Vehicles

Diesel-fueled engines operate differently from gasoline-fueled engines and cannot be expected to adhere to the same standards with regard to visible smoke. Some smoke is permitted from diesel engines. For more details on the test procedures and standards for smoke emissions from diesel-fueled vehicles, click here.

Smoke from Gasoline-Fueled Motor Vehicles

DEP regulations stipulate that a gasoline-fueled motor vehicle shall not emit visible smoke, whether from crankcase emissions or from tailpipe exhaust, for a period in excess of three consecutive seconds. Smoke, in this context, means unburned particles resulting from incomplete combustion. Smoke does not refer to visible water vapor often emitted when starting a vehicle on a cold day. Engines emitting black smoke likely have an overly rich fuel mixture or a malfunction resulting in incomplete combustion of the fuel. Engines emitting white or gray smoke may be burning antifreeze leaking into the combustion chambers from a cracked cylinder head or block. Engines emitting bluish smoke are likely burning oil, which could be the result of various engine problems.

 

Call the NJDEP 24-hour, toll-free hotline at (877) 927-6337 or (877) WARN DEP or your local police department to report idling violations (please do not call 911).