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Pre-ignition (sometimes called knocking or pinking) is when the fuel is ignited before the desired point in the cycle of the engine.
That is not just before tdc on the cycle, because alost every engine begins ignition momentarily before tdc, and as the engine speeds up - even further before.
In essence pre-ignition is an undesired ignition of fuel vapours which has the effect of slowing down the piston as it rises towards top dead centre.
Because it ignites before the proper time, it can damage the piston surface, cause wear in the bearings/gudgeon pin/little end, big end bearings or cause extra wear on the piston skirt or cylinder bore.
The other place pre-ignition can cause damage is on the valve seats/valve head.
Either way the engine has problems. It could be an advance issue (mechanical - distributor or electronic sensor - most modern engines have a pre-ignition sensor), bad fuel blend (too high octane), it could be as a result of a carbon build up in the head/valve area (which can cause a hot spot - a source of ignition for the incoming fuel)
If it's a modern car - get the pinking sensor checking at your local garage, if its an old car with a mechanical distributor - check the timing.
What else can I help you with?
What is the difference between a SI engine and a CI engine?
An SI engine ignites the fuel with a spark (SI = Spark Ignition) whereas the CI engine ignites the fuel with heat generated from compression (CI = compression ignition)
What is a critical compression ratio?
The lowest compression ratio of a compression-ignition engine that allows a specific fuel to be ignited by compression ignition.
When is the resistor bypass used in the ignition circuit?
The resistor bypass in the ignition circuit is used when starting the engine. It bypasses the resistor to provide full battery voltage to the ignition coil, ensuring a strong spark for a quick and reliable engine start. Once the engine is running, the bypass is no longer needed and the resistor is re-engaged to limit the voltage to the ignition coil for normal operation.
Which stage occurs just before the ignition in an internal combustion engine?
Compression
What is dtsi engine meant for?
DTS-I means "Digital Twin Spark ignition".....
Pre ignition in an engine may be detected by?
Pre-ignition in an engine may be detected by engine knocking.
Can a Chevy truck with a 5.7 engine with a tbi cause detonation and pre-ignition?
can a chevy truck with a 350 engine with a tbi cause detonation and pre- ignition?
What causes engine pre ignition in 1997 dodge ram 5.2 engine?
check the timing it may be advanced
Engine still makes noise after turning off?
It is called pre-ignition, find a friendly mechanic.
What happens if low octane in fuel?
The engine may experience spark knock AKA ping or pre-ignition. Excessive pre-ignition can cause damage to engine if allowed to continue.
What is The uncontrolled firing of the fuel air charge in advance of normal spark ignition is known as?
pre-ignition
What happens when you don't run 93 octane in a Lincoln Navigator?
u get pre-ignition nock in the engine and it get worse fuel milage
What is spark ignition engine?
A 'spark ignition ' engine is your regular gasoline engine as opposed to a diesel, which is a 'compression ignition' engine
How ignition timing affects engine temperature?
Ignition timing plays a crucial role in engine temperature management by influencing the combustion process. If the ignition timing is set too early, it can lead to pre-ignition or knocking, resulting in higher temperatures and potential engine damage. Conversely, late ignition timing can cause incomplete combustion, leading to unburned fuel and increased exhaust temperatures. Properly calibrated ignition timing ensures optimal combustion efficiency, helping to maintain the engine's operating temperature within a safe range.
Glowing hot spots in the combution chamber that ignite the fuel before timed ignition is called?
pre-ignition or inaccuratley, Dieselling. it is , of course a hazard, and could cause a backfire, or even an engine explosion.
Can a bad ignition control module cause pinging?
Yes, a faulty ignition control module can contribute to pinging in an engine. Pinging, or pre-ignition, occurs when the air-fuel mixture ignites prematurely in the combustion chamber. If the ignition control module is not providing the correct timing for spark delivery, it can lead to improper combustion and increased engine knock, resulting in pinging. It’s important to diagnose and address any ignition system issues to maintain optimal engine performance.
What is preignition of fuel?
Pre-ignition of fuel that occurs in a spark-ignition engine is when the air/fuel mixture in the cylinder ignites before the spark plug actually fires. It can be initiated from a hot spot such as in the combustion chamber.
