Question about 1996 Ford F150 Regular Cab
96 F-150 351w, 2wheel drive, ext cab. I have been fighting a check engine light for about a year now. The code says that all three O2 sensors pop for something about "heater." I have replaced all o2 sensors, EGR valve, thermostat, air inlet temp sensor, fuel pressure regulator, and about to change the coolant temp sensor. The truck has never overheated or have gotten hot for that matter. Symtoms, running rich and at fuel throttle, light black smoke. After resetting computer, the first start will not trigger the light, I drove one time for over 250 miles and no light. As soon as I turn it off and back on again no matter the length of time the check engine light comes on in about 10-15 seconds. Timming is good. Any ideas?
This is the problem with code readers they bwill tell you the code and sometimes even have a reset feature. However they do not tell you the parameters and don't have an drivability feature so you can not test the ecm and all the sensors or modules while engine is running. diagnostic scan tools are very expensive and hard to use unless you have been trained to do so and PEP BOYs is not what I call real reliable mechanics to begin with. Now I concure with toddG on his reasoning in what might be the potential fault. if your vehicle is running rich or lean your O2 sensor will pick this up on the exaust side, however it is not the sole sensor responsible for the ecm adjusting the fuel air mixture.. you stated that you have switched out several o2 sensors and the fuel pressure regulator, but there is also you mass air flow sensor, your TPS sensor, as well as your map sensor these are worth checking out and just because a faulty sensor is the problem doesn't mean you will get a code each time. the system is built with redundancy in order to keep the vehicle running. in order to get the best possible diagnois take it to a shop where they have a full diagnostic scanner this will have not only OBD1 and OBD2 but cam protocol as well. while the tech is scanning the vehicle he will be able to see how the engine is performing under realtime conditions. please rate this as well as change the rating for toddg because he did offer a valid suggestion
Posted on Oct 02, 2008
Can you give me all the codes????? pcm in this truck has problems and i wanted to cross the codes against this.......
Posted on Oct 02, 2008
Check the Crankshaft Position Sensor
The CP sensor is mounted on the right front of some V8 engines, is a variable reluctance sensor triggered by a trigger pulse wheel (36 minus 1 tooth). Its purpose is to provide the PCM with an accurate ignition timing reference (when the piston reaches 10 degrees BTDC) and injector operation information (twice each crankshaft revolution). The crankshaft vibration damper is fitted with a 4 lobe pulse ring. As the crankshaft rotates, the pulse ring lobes interrupt the magnetic field at the tip of the CP sensor.
Using DVOM on the AC scale and set to monitor less than 5V, measure voltage between the sensor Cylinder Identification (CID) terminal and ground. The sensor is okay if the voltage reading varies more than 0.1V AC with the engine running at varying RPM.
Posted on Sep 24, 2008
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Posted on Jan 02, 2017
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