If the mechanic believes that the mass airflow sensor has gone bad or is failing, he or she will first examine the sensor for any superficial damage. Once the mechanic gets this information they can begin to fix any potential issues. In addition to reading trouble codes, he or she should also be able to get readings of oxygen/fuel intake to make sure those numbers are where they should be. Dirty fuel injectors may cause the engine to run lean which will in turn, cause hesitation when accelerating.Ī mechanic will first plug into your vehicle’s computer using a code reader/scanner to better identify what the exact issue is. Fuel injectors may become dirty over time and not be able to provide as much fuel to the cylinder as is needed. The computer may then not provide the engine with the correct amount of air while accelerating, causing a hesitation sensation.ĭirty/failing fuel injectors: Fuel injectors spray fuel in a fine mist into the cylinder where it is mixed with air and ignited by a spark plug. If the throttle position sensor is not working properly, it may be sending incorrect information to the vehicle’s computer. The computer is then able to adjust the fuel/air mixture going to the engine so that is stays at an appropriate level. Throttle position sensor: A throttle position sensor tells the vehicle’s computer how far the throttle is open and how hard the accelerator is being pressed. A vehicle that hesitates while accelerating or while driving up a hill may have a weak fuel pump. If a fuel pump cannot provide the correct pressure, fuel may have difficulty making it to the engine. A vehicle with a failing mass airflow sensor may also stall soon after starting.įuel Pump: The fuel pump in most modern vehicles sits inside the fuel tank and pumps fuel up to the engine. When a mass airflow sensor begins to fail, it will typically generate an error code or “Check Engine light.” This warning may be accompanied by hesitation while accelerating, or while driving up a hill. Mass Airflow Sensor: The mass airflow sensor measures how much air is entering the engine and relays this information to the vehicle’s computer so that the right amount of fuel can be delivered from the fuel injectors. thanks for any advice in advance.Service type Engine hesitates during acceleration Inspection im guessing with the electric fuel pump that the truck is some what of a fuel injected engine. i am mechanically inclined but due to alot of these parts not being held at my local parts store id like to have atleast a direction to take to try and solve this problem. ![]() which is why id love to get this problem sorted out and fixed because its such a good pickup compared to my 454. the truck runs great down the highway and starts right up and idles great. the truck seems to have alot of vacuum lines capped off which after reading some of your forum pages is common with deleting emissions. the truck has new fuel pump about 50 miles ago along with new fuel filter and air filter. just seems to be while cruising around 2k. ![]() ![]() if youre on the highway it doesnt do it or accelerating it doesnt do it. ![]() its a 1987 king cab D21 pickup with the 2.4 and 5 speed. im trying to keep this pickup alive from neglect of previous owner. Hi im new to the forums and honestly new to nissans.
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