THE VISUAL INSPECTION
During the visual portion of the Smog Inspection, the smog
technician will be looking for the presence and proper
connection of several State of California required, emission
components, as well as conduct a Visible Smoke Test.
The smog technician must locate and verify that all emissions components are present and properly connected. Along with emissions components, the smog technician will also be
looking for any defective or disconnected electrical
connections, vacuum hoses and/or any pipe or plumbing which
would effect engine performance and ultimately increase harmful smog emissions.
Note: During this part of the smog inspection process, the technician's inspection is only visual, and does not
include testing emissions component for proper operation. The technician is required to simply locate the
components visually, and insure they are properly connected.
If a vehicle fails the smog inspection, it is up to the
vehicle's owner to have individual emissions components inspected for damage or defects.
A. Inspected Components
During your personal inspection at home, ensure all hoses
and wires are in place and properly connected. The following is a list of
emission components that will be inspected by the smog
technician:
Additional Emissions Components
The following emissions components are also part of the visual portion of the smog inspection. The smog technician will need to see that they are present and properly connected. NOTE: Certain older model vehicle may not be equipped with one or more of these components.
1. Air Filter & Housing
2. Throttle Position Sensor (TPS)
3. Engine Coolant Temp Sensor (ECT)
4. Manifold Absolute Pressure (MAP)
5. Crankshaft Position Sensor (CKP)
6. Camshaft Position Sensor (CPS)
7. Intake Air Temperature Sensor (IAT)
B. What Causes White or Black Smoke From the Tailpipe or Exhaust? Vehicles subject to a smog check require a visual inspection for excessive black or white smoke being emitted from the exhaust, and ultimately, the tailpipe. This test is in addition to the tailpipe emissions test. If your vehicle is emitting visible smoke, you will need to have it repaired before it can pass the smog check. Vehicles with severe damage may be emitting smoke from the engine comportment (under the hood). This too will cause a Visible Smoke Test failure.
Black Smoke may indicate one of two things. 1. The engine is not burning fuel properly, leaving behind high amounts of Carbon Monoxide (CO), resulting in excessive black smoke being emitted from the tailpipe. These vehicles will experience increased fuel consumption as well. 2. Engine oil is seeping into the combustion chambers. Oil is mixing with the fuel & air mixture, leaving behind high amounts of carbon, seen as excessive black smoke being emitted from the tailpipe. Oil seepage may occur due to defective piston rings, valve seals, or Positive Crank Ventilation (PCV) System.
White Smoke may indicate a burned or blown head gasket. Excessive white smoke (steam) is caused by water seepage into the combustion chambers, which on a running engine, operate around 2500f. Water has an opportunity to enter the combustion chambers through the head gasket, at the junction of an engine's valve head and block. This will typically cause overheating and white smoke coming out of the exhaust.
IMPORTANT: Excessive white smoke should not be mistaken with normally emitted white smoke typically seen during cold days, and until an engine is properly warmed up. The smog program is aware that vehicles may emit white smoke when cold, and insures a vehicle is properly warmed up prior to administering the smog test.
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