I give up
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Originally Posted by f150hotrod
No the computer doesn't control any accessories only the air/fuel ratio and timing for the engine. You have and electrical problem. It could be something as simple and a shorted wire or a bad ground. You need a Haynes manual to trace the wiring. The problem has to be simple but you need to know what you are looking for and the Haynes manual will help you.
If you do not have the PIP it will not turn on the Fuel Pump Relay or TFI.
To bypass the EEC control of the Fuel Pump Relay ground the pin 6 on the Data Link Connector.
The TFI will fire base timing if you pull out the SPOUT.
Lead Driver
Joined: Nov 2002
Posts: 9,556
Likes: 43
From: Concord, NC
Profile ignition pickup, but yes, it is the primary timing information source for the computer - it's a hall effect sensor. I still think the problem is somewhere in the wiring and power supply to the fuel pump and EEC relays.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Originally Posted by 88fordf150
Hi what is the PIP??? and where is it???
Thanks
Thanks
The EEC uses the PIP to find out if the engine is running or not and if the engine is not running at 120 rpm or above it turns off the fuel pumps.
No PIP is zero rpm and the fuel pumps are off.
Note that the EEC will turn on the fuel pumps for one second to pre-pressurization the system when the key is first turned to the on position.
The book says it will also turn on the fuel pumps while cranking but I do not know if the PIP is required for this or not.
And of course with no PIP coming out of the TFI you will get no spark.
Last edited by subford; Sep 8, 2005 at 10:29 AM. Reason: add info
Junior User
Joined: Jan 2005
Posts: 56
Likes: 0
My 88 F250 did the same thing,I replaced the Fuel pump relays ect... no luck.
It was a combination of a bad wire on the Voltage Reg and at the same time the Inertia Fuel Shutoff Switch was tripped?
I fixed the wire and reset the Inertia Fuel Shutoff Switch and she fired right up.
Hope you get it going!
It was a combination of a bad wire on the Voltage Reg and at the same time the Inertia Fuel Shutoff Switch was tripped?
I fixed the wire and reset the Inertia Fuel Shutoff Switch and she fired right up.
Hope you get it going!
Posting Guru
Joined: Jun 2004
Posts: 1,781
Likes: 1
From: Central NY
he can't pull codes... have you checked the eec relay and fuse? You need a working computer before you bother trying to diagnose the fp issue
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Senior User
Joined: Apr 2005
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Thanks for all the help just to let you all know i no longer have the 88f150 ....
and most likly wont buy another f150... for now i have a 98 explorer so i will be up on that forum from now on.......
and most likly wont buy another f150... for now i have a 98 explorer so i will be up on that forum from now on.......