Biodiesel sucks !!
Token Redneck
Joined: Jun 2007
Posts: 9,335
Likes: 344
From: Breckenridge, TX
Comes and goes sometimes, specifically cold starts tend to be bad. But since voltage can be related to alternators and batteries also, it could be several compounding electrical problems contributing to intermittent issues. Dying alternator alternately drops voltage, FICM drops down, poor running truck. Alt comes back up, FICM comes up, truck runs fine.
Best recommendation, buy a gauge setup and watch FICM voltage through the OBDII port. That way when the truck acts up you can watch the voltage live during the issue, instead of chasing it with a DVM under the hood at idle.
Stand alone gauge:
Apple:
http://www.dashboss.com/
Android:
http://torque-bhp.com/
Best recommendation, buy a gauge setup and watch FICM voltage through the OBDII port. That way when the truck acts up you can watch the voltage live during the issue, instead of chasing it with a DVM under the hood at idle.
Stand alone gauge:
Apple:
http://www.dashboss.com/
Android:
http://torque-bhp.com/
Token Redneck
Joined: Jun 2007
Posts: 9,335
Likes: 344
From: Breckenridge, TX
You could also do a fuel pressure gauge. If it's something like a restriction on the pickup screen because of trash in the tank the only way to see that without opening the fuel system is a stand along pressure gauge.
Token Redneck
Joined: Jun 2007
Posts: 9,335
Likes: 344
From: Breckenridge, TX
Did the trash make it to the HPFP? If the tank was really bad, and you weren't using Motorcraft or Racor fuel filters, you might want to pull the fuel pump or the cover and see if it's junked up inside. Does the inside of the secondary fuel filter housing appear clean?
I'd put a fuel pressure gauge in along side the digital gauge. That should cover everything with the fuel system
https://www.ford-trucks.com/forums/1...l#post12858548
I'd put a fuel pressure gauge in along side the digital gauge. That should cover everything with the fuel system
https://www.ford-trucks.com/forums/1...l#post12858548
New User
Joined: Sep 2013
Posts: 7
Likes: 0
Just a thought, but when I lived on a farm we would sometimes use heating oil in place of farm fuel in the farm tractors. Heating oil has a sulfur content of about 500 ppm where as the ultra low sulfur diesel only has 15 ppm. I'm not sure what all damage it would do or how soon the symptoms would show up from running heating oil if maybe that is what the "farm fuel" was.
Certified Thread Hijacker
Joined: Aug 2001
Posts: 14,441
Likes: 60
Just a thought, but when I lived on a farm we would sometimes use heating oil in place of farm fuel in the farm tractors. Heating oil has a sulfur content of about 500 ppm where as the ultra low sulfur diesel only has 15 ppm. I'm not sure what all damage it would do or how soon the symptoms would show up from running heating oil if maybe that is what the "farm fuel" was.
Josh
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