How Do You Know You Have a Bad Knock Sensor
- #one
I bought an OBD II scan tool, and it said that my knock sensor is bad(no check engine low-cal, though). From what I heard, if the knock sensor is bad, the car's computer volition utilise the default timing. I the performance maybe a picayune bad, just it's still drivable. And then, should I spent $138 for a knock sensor or wait another twelvemonth(and hoping that the car even so works) until the Chevy Camaro comes out? BTW, it's a '95 Altima with 65,000 miles on it.
- #2
if it truely is bad, i would replace it. without it, the motorcar cant pull timing should you take detonation (say from a bad tank of gas). detonation or knock can atomic number 82 to a diddled caput gasket if its severe plenty. notwithstanding, im not familiar with an altima and exercise not know how low the timing gets set too should the sensor fail. if its overly safe and fails over to very low timing, operation will suck every bit will gas mileage only you'd be rubber. if it fails over to just base timing, you lot could take chances the same knock problem.
- #3
How did the scanner say it was bad? Is yous engine low-cal burned out? If not erase the stored code and drive to run across if annihilation pops up.
- #4
The code of the scanner was P0325. I did some enquiry, and I found out that the knock sensor would not crusade the bank check engine light to turn on.Originally posted by: Marlin1975
How did the scanner say it was bad? Is yous engine light burned out? If not erase the stored lawmaking and drive to see if anything pops upward.
- #five
Every bit mentioned higher up, clear the code, drive a few days and then check it again.
- Oct 22, 2000
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- #6
Without it, the car will default to the most conservative design. That's a universal neglect-safe.Originally posted by: Homer Simpson
if information technology truely is bad, i would replace information technology. without it, the motorcar deceit pull timing should you have detonation (say from a bad tank of gas). detonation or knock can atomic number 82 to a blown head gasket if its severe enough. nevertheless, im not familiar with an altima and do not know how low the timing gets set likewise should the sensor fail. if its overly condom and fails over to very low timing, performance will suck as will gas mileage but you'd be safe. if it fails over to just base of operations timing, yous could risk the aforementioned knock trouble.
Cars ran fine without knock sensors for decades, as long as he continues to apply the required fuel grade specified in the manual, he'll exist fine.
ZV
- #7
:thumbsup: No knock sensor in my car IIRC.Originally posted by: Zenmervolt
Cars ran fine without knock sensors for decades, equally long equally he continues to apply the required fuel grade specified in the manual, he'll be fine.ZV
- #9
With a bad knock sensor, the car will feel similar a domestic dog and get poorer gas mileage than it should. I don't sympathize why its fifty-fifty a question.
- #ten
It's $138 that could go toward a new Chevy Camaro when it comes out.Originally posted by: Minjin
With a bad knock sensor, the car volition feel like a canis familiaris and get poorer gas mileage than it should. I don't understand why its fifty-fifty a question.
- Oct 22, 2000
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- #11
You've got to be kidding me... You know a lot nearly theory, and are conspicuously a very adept wrench, merely this is everyday use on a throw-away car, not a racetrack state of affairs.Originally posted by: Minjin
With a bad knock sensor, the motorcar will experience like a dog and go poorer gas mileage than information technology should. I don't understand why its even a question.
This is a '95 Altima. The five hp lost because the engine is running conservatively will not exist missed. And the knock sensor's impact on fuel mileage is then modest as to be finer none. Information technology's a smaller fuel mileage hit than running the A/C in the summertime; it's just not worth caring nigh in actual practice.
OP, don't worry nearly information technology. Only use the required grade of gasoline and don't worry about it.
ZV
- #12
Just pointing out, is a 95 Altima fifty-fifty OBDII? That didn't start until 1996. I judge some makers could have started a year early on, or your scanner scans the old stuff, too?
- #13
Information technology's OBDII. I judge Nissan put them in before than required. I wish I had bought a more sophisticated scanner with freeze frame and alive data recording. Information technology's only $149 at amazon.com. This one costs me $60 already. I might return it.Originally posted past: Pacfanweb
Just pointing out, is a 95 Altima even OBDII? That didn't commencement until 1996. I guess some makers could accept started a twelvemonth early on, or your scanner scans the old stuff, as well?
- #xiv
They should be. My 1995 Toyota Tacoma is OBD Ii too. It does have another diagnostic port under the hood that, for the life of me, I can't effigy out what it does.Originally posted by: Pacfanweb
Just pointing out, is a 95 Altima fifty-fifty OBDII? That didn't offset until 1996. I guess some makers could take started a twelvemonth early, or your scanner scans the quondam stuff, too?
- Feb v, 2006
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- #sixteen
Kind of weird that information technology has a knock sensor with it's relatively tame compression ratio of nine.2:1, but I approximate they must use some pretty aggressive ignition timing. As already stated, it will not be very noticeable running the more balmy ignition maps, hence why the CEL is not thrown.
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Source: https://forums.anandtech.com/threads/should-i-replace-my-knock-sensor.122127/
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