02 ford expedition cranks but wont start.

5

Asked by Sep 07, 2016 at 07:31 PM about the 2002 Ford Expedition XLT 4WD

Question type: Maintenance & Repair

I had to rebuild my 5.4 POS triton motor in my 02 ford expedition. Now it wont start. I have replaced the crank and cam position sensors, I tested all the fuses and fuel relay and pcm relay and pcm diode is new.  I replaced all the wires on the engine wire harness and rang them all out and tested resistance- got .2 ohms. I tested fuel cut off switch and theres power past the switch. I get 12 volts at every coil pack and injector. the fuel pump comes on for 1.5 seconds when turned on. when its cranked over I only get 1 pulse flash from noid light at injector 1. if turned off then on again it will flash 1 time again. no pulses to coil packs. I cleaned the ground connections and all are tight. I tested the fuel pressure at the shrader valve on the fuel rail and got no pressure but the instructions on the fuel guage says the motor must be running to read any pressure??  I'm lost now and don't know where to look next. when I tried starting fluid it tried to fire for a second but wouldn't start. now even starting fluid wont do anything.   Please help.

2 Answers

1,635

did you put in new timming chain in if so could be out of time when you put back together.

5

complete rebuild and timing marks all lined up perfect. I had another mechanic double checking all the steps. its strange that the fuel pump works (only 2 years old) but I cant get a pressure reading at the fuel rail. the heads and were machined and set at tdc. its a 2 chain system with single overhead cams. the new chains have stamped marks and colored links, its almost impossible to get it wrong. could the injection system be bleeding pressure somewhere and that shuts down the system? Bad or leaky injectors maybe? over the last 2 years Ive had to put over $6000 into it. nearly 80% under the hood is new or rebuilt. book is $4500 so I don't know when to stop and part it out. its so close to running and its in excellent condition.

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