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I pulled the MAF and it looks perfectly clean as far as I can tell.
Before it would start but run horribly, now it doesn't start at all. Fuel rail pressure is good and I can smell fuel after cranking, almost seems like I'm not getting any spark now, or maybe no air, it's hard to say since the scanner isn't pulling any DTCs despite my check engine light being on.
Hopefully I will have it back in a shop by mid week, cause I'm out of ideas.
If you're not getting air, that means your TB is shot. Bad TBs are a fairly common problem with new Fords, and do go back to the beginning of electronic TBs. I replaced mine for the occasional stall or surge (like every few hundred miles random). It's not the TB valve that is the issue, it is the circuit board that drives the motor. You could try replacing just the motor/board with the Dorman unit for $40 and return it if it doesn't make a difference like I did.
If you're not getting spark your PCM may be shot. Hi-heat, wet environments are the worst place for computers, so that's why Ford put theirs in one.
Maybe you mentioned it... checked/replaced the crank position sensor?
I pulled the MAF and it looks perfectly clean as far as I can tell.
Before it would start but run horribly, now it doesn't start at all. Fuel rail pressure is good and I can smell fuel after cranking, almost seems like I'm not getting any spark now, or maybe no air, it's hard to say since the scanner isn't pulling any DTCs despite my check engine light being on.
Hopefully I will have it back in a shop by mid week, cause I'm out of ideas.
Doesn't your "Check Engine" stay on if the truck isn't running?
I tested the throttle position sensor with a multimeter today. Moved the throttle plate by hand and the voltage increased and decreased how it should.
On the throttle motor/actuator I have 3.6v coming from both of the terminals on the connecting harness. That seems odd to me but I can't find any information about what it should be reading.
Planning to call a tow tomorrow unless I have some kind of revelation before then.
The gas pedal sends its input to the pcm .The card on the TB motor decodes pulses from pcm to drive TB motor .. So you see if the motor is sticking or the linkage or the decoding gets a glitch then it shuts down due to a mismatch . So at one point you have to just buy a new better OEM improved one if you suspect the TB is causing the problem . Sometimes you just can't fix an old part .
^I tried replacing just the motor with a Dorman unit to save money and opened up a world of trouble codes that I'd never known existed. New TB comes with new TPS so I returned the old 2 week old TPS.
I had the truck towed back to the shop last Tuesday. The next day they called and said they suspected the fuel pump. That didn't sound right to me since when I was working on it I could hear the pump come on and I had 35psi of pressure at the rails, but I told them to just replace it if that was what was necessary. It's been a week and I haven't heard back. Fortunately I haven't needed the truck yet.
So as of right now that makes 3 tows, 2.5 weeks in shops, and a ton of hours of my own time working on this thing and I'm not even sure the problem has been identified yet.
Edit: The shop no longer thinks the fuel pump is the problem. They still haven't figured it out. At this point I'm guessing it's either the PCM, or something insanely simple like a frayed wire or cracked hose.
Got an update after 2 weeks back in the shop. They're pretty sure it's the PCM now, which makes sense to me. Apparently there is a huge backorder on them right now (odd, because I see them for sale all over the web) so they don't know how long it will be before they can get one in.
I wish I had the software to set one up myself. I think this is going to cost me a couple arms and a leg.
It's been over a month since the shop ordered a PCM for me. After three weeks of waiting I told them I'd just go ahead and order one myself, which took me all of 5 minutes. The day that unit was set to ship, the shop called and said my PCM finally came in. "We can't send it back" they said. So I cancelled my online order and thankfully got a refund. That was last Friday.
The truck was supposed to be ready first thing Monday. By Wednesday I still hadn't heard anything, so I called. Apparently the mechanic kept forgetting his laptop, which he needed for programming. I called again today and now there's a problem connecting to Ford and everything keeps shutting off when they try to download. Now it's "Hopefully Monday".
The PCM I had ordered online was pre-programmed, if I had gotten that one it would have been plug and play. .
There was snow on the ground when this debacle began, it's now summer and I have a boat collecting dust in my driveway because I can't tow it anywhere. I've had to haul trash in my car. I've had to cancel my plans the last two weekends and fully expect to do the same next weekend. The repair bill is no doubt going to be massive despite the horrendous service. This is a nightmare.
I'm not sure anyone is following this anymore but I figure I'll keep updating for any poor soul who encounters similar issues in the future.
After 2 months waiting for a PCM replacement I finally got my truck back on Friday. The cost was a whopping $1854.07...and it still isn't fixed.
Here's the description of service:
Hook up scan tool- perform pin point test- no fire, replaced crankshaft sensor. Have spark now- too much fuel pressure. Replaced spark plugs. Diagnose fuel pressure, trace wiring to PCM to fuel pressure refulator- found shorted out PCM- replaced PCM. Programmed PCM.
They had to call in two different Ford techs due to problems with programming.
The very next morning it was clear that everything was not ok. The truck struggled to start and I now when I hit the gas I have an ugly screech coming from the driver's side that almost sounds like a bad bearing of some sort. Later that day I got a CEL which I had scanned this morning. I have a pile of codes:
P0191: fuel rail pressure sensor
P0451: evaporative emission pressure sensor
P0172: bank 1 system too rich
P0316: misfire detected on startup
P0302: cylinder 2 misfire detected
P0553: power steering pressure sensor switch circuit/high input
I had the first two when I took the truck in, now I still have those, and 4 more.
I just pulled the #2 coil and plug and can't find anything wrong. Coil is getting power and resistance was good. Plug still looks very new.
I can't afford any more shop repairs so I'll be doing any more work at home. I obviously still have fuel problems, I just need to figure out what to do next.
04-28-2019, 12:28 PM
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