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The reduced engine speeds allow more time for autoignition chemistry to complete thus promoting the possibility of pre-ignition and so called "mega-knock". Under these circumstances, there is still significant debate as to the sources of the pre-ignition event. [3] Pre-ignition and engine knock both sharply increase combustion chamber temperatures.
Did your vehicle's Check Engine light just pop on? An OBD-II scanner can provide some direction. We tested 11 of them to find the best for different situations.
Engine and vehicle monitoring under normal operation, for diagnosis or tuning. Some US auto insurance companies offer reduced premiums if OBD-II vehicle data loggers [43] [44] or cameras [45] are installed – and if the driver's behaviour meets requirements. This is a form of auto insurance risk selection
A check engine light or malfunction indicator lamp (MIL), is a tell-tale that a computerized engine-management system uses to indicate a malfunction or problem with the vehicle ranging from minor (such as a loose gas cap) to serious (worn spark plugs, engine problems or a faulty oil valve, etc.).
It's commonly known as "Detonation or Knock". Engine management systems can overcome pre ignition by the means of a knock or detonation sensor. The sensor will detect pre ignition and retard the engines timing to protect the engine from damage. Undesired engine behavior will occur such as loss of performance or power.
OBD-II PIDs (On-board diagnostics Parameter IDs) are codes used to request data from a vehicle, used as a diagnostic tool.. SAE standard J1979 defines many OBD-II PIDs. All on-road vehicles and trucks sold in North America are required to support a subset of these codes, primarily for state mandated emissions inspections.
A fuel-injected engine may backfire if an intake leak is present (causing the engine to run lean), or a fuel injection component such as an air-flow sensor is defective. Common causes of backfires are: Wankel rotary engines are known for leaking oil into the exhaust system which causes backfire.
When a DTC is raised by the ECU it stores a freeze frame of data (eg rpm). This is often helpful when trying to figure out what caused the problem (eg maybe it raises a DTC for misfire but only when rpm is higher than 5000, which indicates maybe a weak coil). "Freeze DTC" merely indicates which DTC triggered the freeze frame data to be stored.
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