Question about 1991 Ford F150

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My 91 f150 300-6, idles nice until I give it gas then wants to "**** out" and stalls. I have replaced the MAP sensor, Mass Air flow, service egr valve, distributor, what should the fuel pressure be if that would even be the problem? When I have put the OBD ! on it the only code that comes up is regularily was the Safety Nuetral switch. And where would fuel pumps be located other than each each tank, is there a frame pump as well? If so a relay to it as well?

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Fuel filter is where id start

Posted on Oct 16, 2010

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Troubleshooting


Looks like you have changed about all the sensors with exception of the Mass Air Flow Sensor mounted on the air filter housing, and the Oxygen sensors. I would venture to say it is the MAFS, mass air flow sensor.

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1999 ford E150 starts and runs fine, after warm up at idle, rpms varry. will stall at stops but starts and runs fine at high idle and on highway. Trouble codes are 02s bank 1 and bank 2, both lean. also...


I had same problems w/ my 99 Chateau 5.4L. EGR-Ensure port into intake and pipe from exhaust are clear using low pressure compressed air. Pull vacuum on EGR diaphram and ensure it opens and closes smoothly. If this checks out then problem is probably in the EGR sensor (mine had both ports and hoses clogged w/ aluminum corrosion from the sensor, cleaned out hoses and lines to exhaust pipe w/ compressed air, ended up having to change the sensor). IDLE AND O2 SENSOR- Caused by vacuum leaks in the PCV line (line is plastic wrapped w/foam insulation; was cracked under the insulation; both rubber end connectors at manifold and pcv valve were softened, collapsed and leaking; allowing excess air into the manifold after the mass air flow sensor which throws off the O2 sensors. engine computer does not read O2 sensors until after engine is warmed up which is why idle is fine until then).

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Check:
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RPM's up and down check EGR valve and sensor. EGR valve and sensor control idle. That's why your getting the surging on rpm's and this could be giving out the other codes. If mass flow was bad car will not start and the same for the map sensor. O2 sensor measures gas and air for right mixer. TPS controls 0-60 speed as in throttle respons.

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My vehicle just shuts off while im diving, it pulled codes p0453


They might be refering to the MAP Sensor. A manifold absolute pressure sensor (MAP) is one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine's electronic control unit (ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flow. (See stoichiometry.)
An engine control system that uses manifold absolute pressure to calculate air mass uses the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel-injected engines use a MAP sensor to infer mass air flow; some use a MAF (mass air flow) sensor. Several makes use the MAP sensor in OBD II applications to test the EGR valve for functionality. Most notably General Motors uses this approach.
Contents How the MAP value is used The manifold absolute pressure measurement is used to meter fuel. The amount of fuel required is directly related to the mass of air entering the engine. (See stoichiometric.) The mass of air is proportional to the air density, which is proportional to the absolute pressure and inversely proportional to the absolute temperature. (See ideal gas law.) Engine speed determines the frequency, or rate, at which air mass is leaving the intake manifold and entering the cylinders.
(Engine Mass Airflow Rate) ˜ RPM × (Air Density) or equivalently (Engine Mass Airflow Rate) ˜ RPM × MAP / (absolute temperature) They could also be refering to the fuel pressure sensor. If so, then yes this also can cause the problem. You shoud have your fuel pressure checked for about $34.00. If you have a bad fuel pressure regulator you will need to change it out. If it remains undelt with then it could take out your fuel pump. Most fuel pumps are located and installed in the top of your fuel tank and are submerged into your tank. It needs the fuel to keep it cool, but if you continually keep your fuel under 1/4 of a tank you will drastically reduce the life of your fuel pump. Fuel pumps can be expensive to replace. I replaced my wifes in her 1997 Chevy Blazer and it cost me $350.00 (lifetime warrenty). If you keep your gas under a 1/4 of a tank most of the time and your pump is found to b bad then you need to opt for the LIFETIME replacement pump. You only want to have to pay for the pump once, believe me. Otherwise you really haven't provided enough of the symptoms to go on. Does it shut off when you are at speed, or stall when at a stop? If it stalls when you come to a stop you could have bad Oxygen sensor(s). If it's the oxygen sensor(s) then you should replace all of them.

These are merely suggestions.
Good Luck!

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