Inbox : Message
Posted: Fri Oct 26, 2007 10:50 pm
Subject: cold hard start
I understand what you mean about the fuel pump and check valve, but it takes all night to bleed down and ford specs say that will happen at least the book I have does. There should only be about 5 psi in the morning. Question, after the pcm runs it self check when the key is first turned on, does the pcm also shut the power off to the fuel pump relay or is that relay turned off from the icm. As I said, this only happens once a day.
The PCM powers the fuel pump and inertia cut off switch. Once the fuel pump de-energizes the ICOS takes over the fuel pump. Something like the Chevy's fuel pump/oil pressure sending unit.
The pump takes its power from the starter relay blue fusible link and also the distributor red and light blue also at the starter relay.
Might want to test out the EEC power relay and also the ICOS. Also check the fuel pump ground circuit.
Its funny though I got all the information about the electronic engines controls but no fuel pump circuit-The only wire that goes from the inertia switch is the brown wire which I assume that's the wire that powers the pump. Correct me if am wrong with this.
When it hesistates to start check for injector pulse.
Saturday, October 27th, 2007 AT 2:24 AM