Monday, September 19, 2011

How do you know if your map sensor is bad?

I have a 19999 Ford Mustang v6. the problem is when i go to press on the gas the car does not take off like it should it just goes slow then it starts speeding up. but when its parked i can press on the gas and it revs up good only when your driving it has trouble. what can the problem be? I have changed the wires, spark plugs, tps sensor, pcv valve, mass air flow sensor, Fuel filter, transmission filter. Need some help thinking it could be the map sensor or my Fuel pump. whatever help you all can give me would help.How do you know if your map sensor is bad?I don't think your car has a MAP sensor. There are two ways to measure air into the engine. One is done with mass air meter (maf) and the other with a manifold absolute pressure sensor (map). Fords use a MAF..



There is a fuel rail pressure sensor on your fuel rail perhaps that is what you think is the map. This sensor keeps the rail pressure at 45 psi above the manifold pressure. So you see a vacuum line on this sensor, but it is measuring fuel pressure relative to manifold pressure.



Can you check the fuel pressure? There should be a fitting on the rail that looks like a tire valve. connect a press sure gage to it (some autoparts stores will loan them) and make sure it stays above 45 psi all the time.



Your fuel pump might be getting weak. I had a Ford Windstar did the same thing and had to put a fuel pump in it.How do you know if your map sensor is bad?You can generally tell when your O2 sensor is bad with a diagnostic scan. Your problem however seems to be with either fuel delivery, ignition, or air intake. Unless you just don't know what a slipping transmission feels like. Do a fuel system pressure test to make sure its within specs. Im not familiar with the V6 mustang, Im going to assume it has a coil pack ignition. Check it or check them all(whichever you have). Make sure your air filter isn't clogged up.
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