Hey everyone does anyone know where i can find a list of oem part numbers ? I have a 88 f150 351 efi. I am having to replace my crankshaft position sensor and nobody seems to have it or ever heard of it. The guys at the ford dealer have no effin clue lol and said if i could give them a part number then they could find it. Thanks in advance

 

Your truck does not have a crankshaft position sensor that is why no one can find a part number. The only thing that "implies" where the crankshaft position is at is the reluctor that triggers the PIP sensor in the distributor.

What issue are you having and trying to resolve?

 

S.O.B Thats what a mechanic is telling me is bad. "i think i better get my truck back" Well i was having problems with acting like it was running out of fuel I changed my IAC my egr position sensor still had the same problem so i drew it up as a weak fuel pump replaced the pump and then it would not start at all just crank would not even start with starting fluid. i checked for spark and did have spark.

 

You really need to get your truck back. Start with the basics, check fuel pressure, you say you spark but where did you check and what color is it? orange, blue.etc. The ignition control module is a common failure, but you usually do not get any spark when it fails. A bad PIP can also be another contributor. The ICM can be removed and tested. A cheap fuel pressure gauge will tell you if you have the correct fuel pressure.

 

How about a bad fuel pressure regulator?, just adding that.

 

Thanks guys. Yea fuel pressure was good regulator still good. has all new plugs wires cap rotor and fuel filter. for the spark i used a inline spark checker checked on number 1. yea i am getting it back monday

 

Got my truck back been messing with it all day i have spark fuel and correct fuel pressure. still no ignition i am thinking the computer has gone bad so now to hunt one down in a junk yard.

 

The PCM is not really a high failure item. I would take the ICM off then have it tested. One other thought, try disconnecting the MAP sensor, then see if it starts. Now that you have left the truck with someone else I would also verify the timing is correct.

Please quantify "I have correct fuel pressure".

 

will do and give a update as soon as i can. oh yea fuel pressure is 45

 

Timing correct not start with the map unhooked. had the icm tested and its good put in another computer and still nothing... i have pressure and spark even cranking it with the pedal to the floor i get nothing. pulled a plug and its not even wet.

 

have you tried replacing the TFI? depending on the vehicle its mounted on either the fender well by the diagnostic port on on the distributor itself.

 

When the throttle goes to maximum signal the PCM will disable the fuel injectors when trying to start the vehicle. This is a built-in feature. Which brings up a good point. Now that you have verified you have spark and what appears to be good fuel pressure the next item is checking to see if the injectors are being told to turn on.

A test light is your best bet here. Attach it to an injector plug, crank over the engine, see if the test light flashes. If not then you know your issue is injector firing. I have seen a PIP or two cause this problem. The PIP is used to trigger both the spark and the injector firing by way of the PCM. The PCM uses the PIP signal as the trigger point for the injectors. I have seen a few cases where there is spark, but no injector triggering pulses from the PCM.

+12VDC is sent from the load side of the PCM relay to the injectors. The return is supplied through the PCM via pins 58 and 59. If the +12VDC is missing or a break in the wiring to the PCM the injectors will not trigger on.

Another quick check is to disconnect the TPS sensor. If the VREF signal has shorted to the signal output the PCM will think the throttle pedal is at maximum (floored) therefore it will not trigger the injectors.

 

Thanks for the info. gotta fix this thing in a hurry lol or it will be scrap