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A control loop is permanently monitoring the signal of one or more knock sensors (commonly piezoelectric sensor which are able to translate vibrations into an electric signal). If the characteristic pressure peak of a knocking combustion is detected the ignition timing is retarded by steps of a few degrees.
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.
Some engines, such as GM's Premium V family, use crank position sensors which read a reluctor ring integral to the harmonic balancer. This is a much more accurate method of determining the position of the crankshaft and allows the computer to determine, within a few degrees, the exact position of the crankshaft (and thereby all connected ...
The AMC 2.5 L I4 and GM's V6 shared the same drivetrain components in Jeep vehicles, whereas stronger transmissions were needed for the new 4.0 L. The 2.5 L also shared an 18mm threaded oil filter used with the GM 2.8 L ( ACDelco PF47 or equivalent) through 1986, when the 4.0 L was phased into production with the XJ models, the oil filter was ...
It was used on all GM vehicles, at least in the North American market, from 1975 through the mid-1980s. [vague] The system is an electronic system that requires no scheduled maintenance, provides up to 35,000 volts to fire the spark plugs and increase spark plug life, especially when unleaded fuel is used. The HEI system has 40% more voltage ...
The ML4.1 system did not include provision for a knock sensor for timing adjustment. The ignition timing and fuel map could be altered to take account of fuels with different octane ratings by connecting a calibrated resistor (taking the form of an "octane coding plug" in the vehicle's wiring loom) to one of the ECU pins, the resistance ...
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