Not MAP sensor, MAF or MASS AIR FLOW sensor. Its somewhere in the air intake flow before the injection system. Usually looks like a little screen. MAP Manifold absolute pressure sensor.
Remember GIGO - Garbage In, Garbage Out. The vehicle sensors act the like the engines eyes and ears helping it make the most of its driving conditions. Consequently, the Powertrain Control Module (PCM) can't do this if the inputs it receives are faulty or missing. For example, the engine control system will not go into "closed loop," if the PCM does not receive a good signal from the coolant sensor or oxygen sensor. Nor can it balance the fuel mixture correctly if it does not receive good inputs from the throttle position sensor, MAP sensor or airflow sensor. A MAP sensor (manifold absolute pressure) is one of the sensors used in an internal combustion engine's electronic control system. The manifold absolute pressure measurement is critical to an engine's electronic control unit (ECU) in order to calculate fuel and spark requirements. Accurate and precise air massmeasurement is required to meter fuel mass to achieve acceptable emission control under all operating conditions. The MAP sensor measures the "absolute pressure" (not manifold vacuum) in the engine's intake manifold. The mass of air entering the engine is directly proportional to its density. Density is directly proportional to the air's absolute pressure, and inversely proportional to the air's absolute temperature. hesitation when accelerating, elevated emissions and poor engine performance. The engine will run with a bad MAP sensor, but it will run poorly. Some PCMs can substitute "estimated data" for a missing or out of range MAP signal, but engine performance will be drastically reduced.
It sounds like a problem with the MAF/MAP sensor - depending on vehicle make, model and year - either Mass Air Flow sensor (measures amount of air flowing into the engine) or Manifold Absolute Pressure sensor (measures vacuum in the intake manifold), either of which gives the computer information on engine airflow and load. Depending on vehicle, it has specific volt or ohm readings that need to be verified for proper operation.
the knock sensor on a 91 camaro 305 in on the passenger side of the block, bellow the exhaust manifold. its a few inches in front of the bell housing., and has a single wire running to it. looks a bit like a temp sensor, or oil pressure sensor.
The oxygen sensor is located in the exhaust manifold before the catalytic convertor. If you look down between the radiator and the exhaust manifold a few inches before the exhaust pipe connects to the exhaust manifold you will see the Oxygen sensor. The sensor will have 2 wires coming from it and it kinda looks like a sparkplug stuck into the exhaust manifold. There is 2 nuts that hold the oxygen sensor into the exhaust manifold.
Possibilities:Ignition: check plugs, cap rotor etcFuel pressure, Failed fuel pump or regulator, Check pressure at port.Control system readings incorrect. Need to get car onto a scanner and see what readings are out of calibration. Throttle position sensor, MAP sensor (Manifold Absolute Pressure), O2 Sensor could cause this if it is disconnected or way out of rangePlugged exhaust system, Muffler or Catalyst or has some one stuffed something in the tail pipes?Plugged air cleaner.Internal engine problem like a bad camshaft
start by checking choke operation but it sounds like MAP( Manifold Absolute Pressure ) sensor is going bad be sure to disconnect battery before starting project the reconnecting after everything is mounted and hooked back up to prevent shorting out electrical sensor
it could be the stepper motor aka iac (idle air control valve) its located next to the throttle butterfly looks like a motor with two torx 10 screws at either side coloured black take it out and clean it if that doesn't work change the MAP sensor manifold absolute pressure
the o2 sensor is in the exaust manifold or down pipe it looks like a sparkplug with wires
In the exaust manifold. If you raise the hood and look down on the front of the engine, you will see the exaust manifold, and there will be a sensor screwed into the middle of that manifold. That is the O2 sensor. There is another sensor further down the exaust system that looks just like it that some people mistake for an O2 sensor, but that sensor is called a catalyst moniter. But the one you can see while standing in front of the car with the hood up is the O2 sensor.
Do you mean the CO2 sensor? It is in the exhaust manifold where the pipes come together. The sensor looks like a spark plug with one wire coming out of it.
A good place to start would be to check for engine vacuum leaks. Check MAP & TPS Sensors (Manifold Absolute Pressure & Throttle Position Sensor).