Keith Browning Posted October 26, 2017 Share Posted October 26, 2017 Had a 2014 F450 in with the check engine light on and reduced engine power due to a P0087. No other codes. The truck Was in a week ago with the same code, same concern and the tech put filters in it and road tested it and sent it off. I took the truck this time, cleared the code and got the code to repeat instantly. The pinpoint tests lead to M20 removing the fuel return line from the left fuel rail, turning on the fuel pump and playing with the PCV and VCV and monitoring the fuel flow out of the rail. here is the pinpoint test question: Does the fuel flow from the left hand fuel rail while the F_VCV PID is commanded to the lowest duty cycle value and stop when the F_VCV PID is commanded to the highest duty cycle value? Well fuel was flowing then it almost stopped... it reduced to a drip about every two seconds. (When I performed the same test for the PCV the fuel flow stopped completely) So I interpreted that as "No" it did not stop, or at least not fully. I replaced the VCV accordingly and road tested the truck with no repeat check engine light. But given the possible cause of "VCV stuck CLOSED" I am a little uneasy about this one so I am keeping my fingers crossed. How would YOU have answered the question given the results? Quote Link to comment Share on other sites More sharing options...
tonybullitt Posted October 27, 2017 Share Posted October 27, 2017 I would have done the same as you did. Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted October 27, 2017 Share Posted October 27, 2017 1 hour ago, tonybullitt said: I would have done the same as you did. I agree. Quote Link to comment Share on other sites More sharing options...
nelsona19 Posted October 27, 2017 Share Posted October 27, 2017 I had the same concern on one, ended up being the paper disk from fuel additive container was plugging tank pickup and would cause the intermittent lack of power and p0087.I also put fuel filters in it first just to have it almost die on test drive. Customer was not happy when he had to pay for it. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted October 28, 2017 Author Share Posted October 28, 2017 22 hours ago, nelsona19 said: I had the same concern on one, ended up being the paper disk from fuel additive container was plugging tank pickup and would cause the intermittent lack of power and p0087.I also put fuel filters in it first just to have it almost die on test drive. Customer was not happy when he had to pay for it. I remembered that topic here. Even though I did not have any low pressure system codes I still pulled the pick-up assembly to have a look. This particular truck also had the aft axle fuel tank rust out internally a year ago and I replaced it with a Titan plastic tank. I wanted to see if there was anything unusual going on there - there was not though. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted October 31, 2017 Author Share Posted October 31, 2017 Well I knew the VCV would not cause this. Truck returned today but this time the CEL was coming on while towing, but, none the less the code returned. Reran the tests intil I got to testing the PCV and the VCV/ I just pulled the PCV and drained the fuel rail into a black cap. Bunch of fine, shiny metal particles. No rust or corrosion. Time to order a high pressure kit. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted February 8, 2018 Author Share Posted February 8, 2018 ...which fixed this one. Quote Link to comment Share on other sites More sharing options...
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