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All the funny sencers on a engine

Home Forums Stay Dirty Lounge General Discussion All the funny sencers on a engine All the funny sencers on a engine


    All these sensors are what make our cars reliable. They weren’t handing out 100k Warranties on cars in 1960 were they? You were lucky if your car saw 120k on the odometer. Most of the sensors keep the fuel going into the cylinders at the optimal amounts and as close to a “lean” condition as the other sensors will allow. The knock sensor for example will tell the computer that it is running the engine too lean because the engine will start to “ping” if the engine is running too lean, or if the ignition advance is set to aggressively. It also allows you to get 44mpg out of a Chevy Cruze instead of 25mpg out of a Chevy Chevette. Those old cars with Carburetors and simple electronic ignition systems just can’t make those minute adjustments hundreds of times a second. It’s like playing video games on an Atari 2600 vs one of todays top end systems. Sure, you could take the cartridge out and blow on it, maybe clean the contacts and drive your little pixelated version of a tank around shooting your giant square block at the other guy and maybe you have to completely disassemble your Xbox to fix the RED RING OF DEATH. But when you get into THAT tank, it’s an M1A2 Abrahms and it’s taking down the Taliban @60mph across the desert just as if you were actually there. So, what’s the price you’d rather pay?

    Oh, and VSS Vehicle Speed Sensor…used to measure the rotation of the output shaft on the transmission. A tech can plug in the parameters of the particular tire you put on your vehicle so that your speedometer reads correctly..had to replace the gear in the transmission back in the day or learn how much of a difference there is the in speed you are going vs the speed you are seeing on the gauge.

    Another nice function of the VSS is that the computer uses it to control your cruise control, on some cars it is used in conjuction with your ABS system and it is also used in that nice little display that tells you how many miles until you are out of fuel and what your fuel economy is.

    O2 sensors have an upstream and downstream sensor. The upstream sensor reads the amount of unburned fuel after the engine combusts it in the combustion cycle and expels it in the exhaust cycle. The Downstream sensor tells the computer how efficient the Catalytic converter is burning off the excess fuel. The important sensor is the upstream sensor ( Bank 1 Sensor 1 or Bank 2 Sensor 1 ). That tells the computer how efficient the motor is at converting fuel into power. The Downstream sensors primary job is to help regulate Fuel trim, but it’s mostly there to make sure that you aren’t expelling to many emissions related gasses to the atmosphere.

    Terms to know in regards to O2 sensors on Scanners. When you are looking at “live data” meaning the information the computer sees from the O2 sensors while the engine is running. You want to see your sensors as close to “0” as possible. Single digit readings are okay, but if you are constantly in double digits, then you need to investigate why.

    LTFT and STFT are terms seen on scanners with live data. This means “Long Term Fuel Trim” or “Short Term Fuel Trim”. I’m just beginning to learn all the ins and outs of these numbers, but again…”0″ is ideal

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