You might have done damage to the engine depending on how long this has been happening for and how bad it is. You need to pull the engine and open it up to determine if you have a problem or how bad the engine is. Adam answered 12 years ago. If it's under warranty take it to the dealer. If memory serves Subarus had a common engine oiling problem from that time period some retarded filter screen in an oil passage gets blocked or something, I can't remember the specifics.
So make sure you have records of your oil changes because if it's related to that they will attempt to get out of paying for the repair. There are no fluid leaks, but th I have no extended warranty. Any options available to have it fixed at a lesser cost? I am third owner of a Subaru Impreza 2. I did my routine oil changes and maintenance Review another car.
A: In short, any number of conditions or factors can induce detonation. A: There are some known situations where it is very common to see timing corrections in response to perceived engine noise. In general, these events are not of concern and should not be particularly alarming unless the corrections are very large.
What are some things to try or items to check? Not all detonation and knock events are created equal. The former is very common for an engine running on pump gas; the latter is extremely rare but the risk is very real. It is much more concerning to observe repeated knock events when cylinder pressures are very high, such as during full boost WOT operation as the chance of engine damage from knock is much higher under those conditions.
Assuming you are using normal pump gasoline, be sure you are using the highest grade pump fuel available in your area please see below for more information about octane rating ; discount gas retailers often have an inconsistent fuel quality or come from varied sources. Additionally, please be sure to review the map notes to ensure the hardware on the vehicle properly matches the chosen map and that the boost levels being achieved are within the acceptable ranges for that particular map.
Depending on certain conditions primarily Dynamic Advance Multiplier , if the current level of resistance to detonation is poor enough to warrant additional actions, an alternate richer fueling table will be activated and the boost control will be disabled.
A richer mixture, to a point, will have a higher resistance to detonation and helps removes heat from the combustion chamber.
Conversely, an overly rich mixture can induce detonation as well, especially without properly advanced ignition timing to account for the longer combustion times.
A: While often used interchangeably, the terms detonation, knock, and pre-ignition, depending on interpretation, can refer to different events. It generally refers to the complete loss of control over the full combustion event. Pre-ignition is initiated by an ignition source other than the spark, such as hot spots in the combustion chamber, a spark plug that runs too hot for the application, or carbonaceous deposits in the combustion chamber heated to incandescence by previous engine combustion events.
Since higher octane fuels have higher activation energy requirements, it is less likely that a given compression will cause uncontrolled ignition, otherwise known as autoignition or detonation. A: In all likelihood, nothing!
You need to look at when it is incrementing, putting more emphasis on the consistent reported knock at a higher load such as during wide-open throttle. Keep in mind that every tune even the factory tune on a bone stock car will report knocking events on occasion. Also, some cylinders will be naturally more prone to incrementing this value where the system is not accurate.
Fear not, your car did NOT knock times! Click here for our Subaru Datalogging Guide. Phone support available 9am to 6pm Monday-Thursday. Customer Support Center. Knocking can also be caused by low oil. Before getting into the diagnosis portion, make sure that you do an OBDII scan if the check engine light is on.
This scan data will give you information that can help you pinpoint the problem with your Impreza. You can either purchase a scanner they are pretty cheap or you can go to the local parts store.
Most of them provide this service to you at no charge. Sometimes a knocking or ping sound can be caused by something as simple as using the wrong gas. The octane rating corresponds to the amount of compression that it can take before igniting.
Octane rating matters. Your engine was designed to use the type of fuel recommended by Subaru. While many modern vehicles can go k miles with no issues at all from their spark plugs, they can still cause problems when they wear out. When the spark plugs wear out, or foul out, they are going to cause a misfire. This misfire will throw a code such as P random cylinder misfire.
This code means that the cylinders are misfiring, but the misfire is occurring randomly in multiply cylinders.
There are also cylinder specific codes that correspond to which cylinder is misfiring.
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