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Author Topic: Ford mechanics, I need help!!  (Read 1379 times)

Offline syoungs

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Ford mechanics, I need help!!
« on: January 11, 2017, 06:26:31 PM »
Bought a new truck (used) at the end of November, and it's been nothing but a problem, everything on it is great, but I'm having problems with intermittent low fuel pressure, low enough the engine stalls, sometimes while driving, others while parked.
 

05 f250, 3v v10. Fuel pressure runs 39-40# at idle, but will randomly drop down to 3-5#, sometimes at idle, sometimes while driving, which causes the engine to stall. Most of the time it will not restart right away, sometimes it will. letting it sit for 5+ hours and it almost always fires right back up.

I've replaced the fuel pump, fuel pump driver module, and fuel rail pressure sensor. Still having intermittent problem though. Only code is po191, fuel rail pressure sensor .

While working and monitoring pids I noticed the voltage jumping around some, from 13.3-14.2, most times when the truck stalls, voltage is down to 12.2
New alternator is on the way, current one tested bad, new battery is installed. Running Sans alternator, with fresh, new, battery, truck will still stall, at around 12.2-12.5v.

Problem seems to be related to the weather, if it's cold and wet, it happens. Haven't had it happen on a dry day yet.

Anybody have any ideas on where I should start? Gonna start looking at wiring to see if I have a bad wire somewhere under the truck this weekend. Could it possibly just be the crappy electrical system that was causing it?

Thanks in advance!

Offline cbond3318

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Re: Ford mechanics, I need help!!
« Reply #1 on: January 11, 2017, 06:29:45 PM »
I have the 03' , V10, have you changed the inline fuel filter nearest the tank?

Mine had very similar symptoms , same code thrown , over the coarse of 2 weeks and it was the filter...I never was checking pressures and voltages though. Just figured I'd start at the easiest cheapest part....
You know what they say, never crap in one hand and slap a gift horse in the mouth.

Online JDHasty

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Re: Ford mechanics, I need help!!
« Reply #2 on: January 11, 2017, 06:59:13 PM »
Does it have a second, low pressure, fuel pump in the tank?  That can cause issues when it is going out because the high pressure pump needs head pressure to operate correctly. 

Offline syoungs

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Re: Ford mechanics, I need help!!
« Reply #3 on: January 11, 2017, 07:04:09 PM »
Oh yeah, new fuel filter as well.

It's a gas rig JDHasty, only the one pump in the tank, which is new.

Offline 92xj

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Re: Ford mechanics, I need help!!
« Reply #4 on: January 11, 2017, 07:13:22 PM »
Check and clean all ground wire connections. I've seen bad grounds cause all sorts of weird issues. It's a real easy and cheap starting point in the chase and 75percent of the time a main cause of issues.
"If you have to be crazy to hunt ducks, I do not wish to be sane."

Offline syoungs

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Re: Ford mechanics, I need help!!
« Reply #5 on: January 11, 2017, 07:15:48 PM »
Cleaned the rear ground, and main grounds, I need to dig around and find the rest of them though, actually forgot this was on my short list of to do's!

Offline Zardoz

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Re: Ford mechanics, I need help!!
« Reply #6 on: January 11, 2017, 07:47:44 PM »
Check and clean all ground wire connections. I've seen bad grounds cause all sorts of weird issues. It's a real easy and cheap starting point in the chase and 75percent of the time a main cause of issues.

Kinda related. Years ago my Ford would just quit. After changing a lot of parts and not fixing the problem, I discovered by chance the problem was caused by faulty intermittent connections in the wire connection modules due to corrosion. I disconnect all connection points and cleaned them with a modified finger nail file board. Put some new electrical grease in the and problem solved. The connections all looked good because the corrosion layer was hard to see.   :twocents:

Offline cbond3318

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Re: Ford mechanics, I need help!!
« Reply #7 on: January 11, 2017, 07:57:18 PM »
There is also a Fuel Pump Driver Module that can be potentially shorting to ground during wet conditions. My only experience beyond what I have fixed is the extensive online troubleshooting. Those type issues can be frustrating ghosts !
You know what they say, never crap in one hand and slap a gift horse in the mouth.

Offline cbond3318

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Re: Ford mechanics, I need help!!
« Reply #8 on: January 11, 2017, 07:59:57 PM »
I kind  of have the thought that if it is anything outside of the isolated fuel delivery system, you would be showing more than the one code.
You know what they say, never crap in one hand and slap a gift horse in the mouth.

Offline syoungs

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Re: Ford mechanics, I need help!!
« Reply #9 on: January 11, 2017, 08:20:41 PM »
I kind  of have the thought that if it is anything outside of the isolated fuel delivery system, you would be showing more than the one code.

This was my thought as well, I do randomly get a code for the evap canister not being able to bleed pressure or something along those lines, I've seen that code one time, cleared it, cleaned up the EVAP system and hasn't been back.

The driver module is new as well, if I can catch it while it's throwing low fuel pressure, I'm hoping to test the supply and ground to the pump, if those are in spec, maybe I'm fighting a bad fuel pump or bad connections in the tank. Really regretting selling my last truck!

Offline Mark_436

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Re: Ford mechanics, I need help!!
« Reply #10 on: January 11, 2017, 08:32:55 PM »
I had an old Nissan that had a similar issue. Never did find the cause. I wired the fuel pump to my running lights and that solved the problem, just had to remember to turn my lights on to drive it...

Offline huntnphool

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Re: Ford mechanics, I need help!!
« Reply #11 on: January 11, 2017, 08:36:55 PM »
@jackelope @coachcw
The things that come to those who wait, may be the things left by those who got there first!

Offline syoungs

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Re: Ford mechanics, I need help!!
« Reply #12 on: January 11, 2017, 08:43:30 PM »
I had an old Nissan that had a similar issue. Never did find the cause. I wired the fuel pump to my running lights and that solved the problem, just had to remember to turn my lights on to drive it...

Did the exact same thing on a old beater Subaru that I had years ago, won't work on this though, it's a returnless fuel system., No regulator in the fuel rail, regulates pressure by turning the pump on and off basically.

Offline yum tag soup

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Re: Ford mechanics, I need help!!
« Reply #13 on: January 11, 2017, 09:14:34 PM »
The correct fix for this is to sell it and buy a dodge  :IBCOOL:

Offline Mudman

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Re: Ford mechanics, I need help!!
« Reply #14 on: January 11, 2017, 09:29:41 PM »
Its electrical.  Alt. battery connections broken wire? PCM??  Gonna be a beach to find.
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Offline syoungs

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Re: Ford mechanics, I need help!!
« Reply #15 on: January 11, 2017, 09:35:32 PM »
I'm really hoping that the new alternator will fix it, but I'm not that lucky I don't think. Gonna chase the grounds down this weekend and give them all a cleaning, I'm almost wondering if my winch or amplifiers may be doing something funny as well... I think it's gonna be a long road till she's perfect

Offline birdshooter1189

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Re: Ford mechanics, I need help!!
« Reply #16 on: January 11, 2017, 10:06:45 PM »
My dad has a chevy suburban that had similar issues....Intermittently wouldn't start(would crank over forever and wouldn't even try to fire), and a couple times died on the side of the road while driving.  A couple times when it wouldn't start, after sitting a day or two then it started up and ran fine. Kept chasing the issue to the engine not getting fuel, and from that to the fuel pump.  He replaced the fuel pump 4 or 5 times over a span of about 2 years and kept having the same issue.  Then finally got a code reader and found out it was the crank position sensor on the engine.  When that would sporadically fail it would cut power to the fuel pump and made it appear that the fuel pump failed.

I know it's a different engine, but I'd recommend checking that sensor.  Should be a rather cheap part.  Hopefully it's easy to get to on your engine.


Offline syoungs

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Re: Ford mechanics, I need help!!
« Reply #17 on: January 11, 2017, 10:08:39 PM »
Thanks for the info! Exactly what kinds doing, and being somewhat weather related I can buy that the crank sensor could be the culprit... It's cheap enough that it's getting a new one Friday just because! If that works, I owe ya a beer for sure

Offline hollymaster

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Re: Ford mechanics, I need help!!
« Reply #18 on: January 11, 2017, 10:10:00 PM »
The correct fix for this is to sell it and buy a dodge  :IBCOOL:
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Need the diesel motor.  :tup:

Offline syoungs

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Re: Ford mechanics, I need help!!
« Reply #19 on: January 11, 2017, 10:31:23 PM »
Sold a perfectly good 7.3 to buy this  :yike:

I like the v10 platform, more truck then I'd ever need, and not a daily driver so I don't care that the diesel gets better mpg's.

This specific truck... :bash:

Offline huntnphool

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Re: Ford mechanics, I need help!!
« Reply #20 on: January 11, 2017, 11:22:40 PM »
Sold a perfectly good 7.3 to buy this  :yike:

I like the v10 platform, more truck then I'd ever need, and not a daily driver so I don't care that the diesel gets better mpg's.

This specific truck... :bash:

 I would have kept the 7.3, I drive mine daily. :dunno:

I'm really hoping that the new alternator will fix it, but I'm not that lucky I don't think. Gonna chase the grounds down this weekend and give them all a cleaning, I'm almost wondering if my winch or amplifiers may be doing something funny as well... I think it's gonna be a long road till she's perfect

 A bad alternator is not going to cause your fuel pressure in that truck to drop from 39-40# to 3-5# :twocents:
The things that come to those who wait, may be the things left by those who got there first!

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Re: Ford mechanics, I need help!!
« Reply #21 on: January 12, 2017, 03:30:26 AM »
Here's an idea.  An old trick was to put a plastic bag in someone you are at war with' fuel tank.  The siphon would suck it up around the intake cutting off fuel flow and killing the engine.  Then after sitting for a while the bag without suction keeping it in place the bag Seoul drift free allowing the engine to start and totally frustrating the person trying to track down the issue. 

Just a thought. 

Offline Zardoz

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Re: Ford mechanics, I need help!!
« Reply #22 on: January 12, 2017, 11:41:06 AM »
Here's an idea.  An old trick was to put a plastic bag in someone you are at war with' fuel tank.  The siphon would suck it up around the intake cutting off fuel flow and killing the engine.  Then after sitting for a while the bag without suction keeping it in place the bag Seoul drift free allowing the engine to start and totally frustrating the person trying to track down the issue. 

Just a thought.

Is that experience speaking?   :chuckle:

Online JDHasty

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Re: Ford mechanics, I need help!!
« Reply #23 on: January 12, 2017, 12:27:40 PM »
Here's an idea.  An old trick was to put a plastic bag in someone you are at war with' fuel tank.  The siphon would suck it up around the intake cutting off fuel flow and killing the engine.  Then after sitting for a while the bag without suction keeping it in place the bag Seoul drift free allowing the engine to start and totally frustrating the person trying to track down the issue. 

Just a thought.

Is that experience speaking?   :chuckle:

Yes, it happened to my boss.  When he finally found out what the problem was he was livid.  The mechanic who finally fixed the problem said that it was an old trick and it was something he always checked for after first encountering it a couple decades earlier. 

Offline syoungs

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Re: Ford mechanics, I need help!!
« Reply #24 on: January 12, 2017, 01:09:44 PM »
When it rains it pours, hopped in my Subaru to head to work this morning, tranny grenaded while it was warming up  :bash:

Haven't looked into it to much yet, hopefully i can find a cheap used one, if not I'm gonna scrap the car and start over.

 

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