Will the knock sensor make any difference to the way the car runs? it has a crack in it.
The check engine light comes on and goes off. the knock sensor has a crack in it, so the local mechanic put it on a diagnostic scanner and everything came out okay?? it recently had a new battery fitted and the codes may have been lost. when the reeves are up it runs fine, but when the reeves are down it is really rough like it is trying to run over lumps. also as we have not had this car for long, where are the fuel filters located? thank you
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Re: will the knock sensor make any difference to the way...
Your car is not OBD-II, some dealers still have the Subaru Select Monitor required, some haven't kept them. Your local mechanic is unlikely to have spent $2,000 for a tool that only works on 15 to 20 year old Subarus. You can read the check engine light codes without any special tools though, see http://legacycentral.org/library/literature/codes.htm
The fuel filter is right next to the windshield washer fluid tank.
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It means that the engine is running lean which can cause engine knock. When the knock sensors detect excessive knock they set the check engine light.
Low fuel pressure.
Dirty fuel filter.
Dirty or bad MAF sensor.
Bad MAP sensor.
I would tend to say the knock sensor is a result of the 02 sensor, because if it is not reading correctly it could be reporting the engine is running to rich, there for leaning out the air fuel mixture resulting in knocking which is then picked up by the knock sensor. I would start by replacing the O2 sensor in bank 1.
Most vehicles are designed to run on 87 octane, unless specified different in the owners manual. The knock sensors on your engine will detect an engine knock and advance or ****** the timing accordingly. If your engine is spark knocking, your "Check Engine" light should be on detecting a faulty knock sensor, hope this helps, Gary
If the car is pinging you will set a knock sensor code.'
This comes from bad gas and running lean., You really need this professionally inspected to rule out the basics. I have seen alot of nissans with the knock sensor code stored but the light is still off.
Fill up the tank with high octane chevron and some techron injector cleaner and clear the light. If it stays off for a couple days then go get it inspected. Even if the code is stored it will still pass as long as the light is still off and the monitors have run.
The light comes on when you climb a hill, accelerate quickly or do anything that advances the timing a lot and the knock sensor doesn't hear the knocks (pinging). The engine timing is not retarded, so you get a misfire.
The computer turns off the CEL if it sees the car start and run with no misfire of this nature 4 times in a row.