my f350 sometimes starts and sometimes wont

10

Asked by Dec 13, 2013 at 08:58 PM about the 2002 Ford F-350 Super Duty XLT Crew Cab LB

Question type: Maintenance & Repair

I have changed the fuel pump fuel filter and camshaft position sensor, I can drive it for a few days the all of a sudden drive somewhere turn the truck off go to start it and it wont start it has been doing this the last month and it is getting very frustrating I have  no idea what could be wrong

2 Answers

the main ground connection to the frame is corroded...rusty...a layer of semi-conductor has developed these 300 or so starts...combined with thermal cycling of day and night depends on where you park the truck...subject to morning dew? all these factors make it harder for the system ground to get through to the chassis....unbolt the connection between the 1/0 battery cable and the ground spot on the fender or frame...don't forget the one that goes to the engine block (near the alternator bracket) so we'll have good ground then~...to the delicate components that do not even use 50 milliamps to do their job...but are sensitive to varying voltages and available amperages....but we are gonna fix all that with a pliers and wirebrush~...also a NEW battery...the tin/antimony alloy batteries will only last five years~...mmmkay what is wrong is the reduced voltage has made the relays drop out....shuttin' you down proper~....fresh ground will fix ya~

2 of 2 people found this helpful.
22,455

fuel pump relay may not always connect, if you haven't done that already

3 of 3 people found this helpful.

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