Looking for help no start 96 ps

prgavin · #1 (**permalink**) 02-05-2007, 10:44 AM

Hello guys,
Here goes. I have 96 7.3 f250. Engine will not start. Changed the GPR and the Cam sensor still want start. I checked the fuses and #22 was blown and replaced it and it kicked over for a few hours. When I am cranking i get no tach. I checked the GP's and I one that shows on ohms at all.
I am thinking that it could be the wiring harness under the valve cover. Would this cause the wait to start light not to come on. Also the gp relay has power to the one hot terminal. The terminal that suppose to kick on when you turn the key does not come on.
So my question is what are the symptoms of the wiring harness being burnt out.?
Thanks

**SCUFFY828** · #2 (**permalink**) 02-05-2007, 10:47 AM

the only thing that can cause your problem is no power to the pcm ,did you ever recheck all fuses

***bigcountrysg*** · #3 (**permalink**) 02-05-2007, 10:53 AM

What is your voltage in your batteries. I believe you need 10.5 volts in order for the ECM to work.

Scott I believe the PCM is on the tranny, the little black box in front of the gear shifter on the tranny. I maybe wrong though, to many cm's on these trucks to keep track of which one is where.

68EVILTWIN · #4 (**permalink**) 02-05-2007, 10:53 AM

The Only Thing That Controls The Wait To Start Lamp Is The Pcm.you Are Losing Pcm Power.

**SCUFFY828** · #5 (**permalink**) 02-05-2007, 11:01 AM

the pcm controls everything engine and trans on this truck ,and is located in left rear firewall behind the idm which is right beind the fuse box on top of inner fender

68EVILTWIN · #6 (**permalink**) 02-05-2007, 11:03 AM

Is fuse #22 still blowing.If it is you are going to have to unplug the harness connector on the right side of the filter housing.If the fuse doesn't blow then the fuel heater is shorted out against the housing.I have seen this too many times.

***bigcountrysg*** · #7 (**permalink**) 02-05-2007, 11:06 AM

Quote:

Originally Posted by scott whisenhunt

the pcm controls everything engine and trans on this truck ,and is located in left rear firewall behind the idm which is right beind the fuse box on top of inner fender

like I said to many dm's, cm's, em's and what not to keep track and not get confused.

**SCUFFY828** · #8 (**permalink**) 02-05-2007, 11:19 AM

not a problem ,i just pm him my cell hone number and i think i got i headed in the right direction

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