Been chasing this code for about 2 years now lol. Might have to follow the PCV lines right to the intake next. Runs well except at wide open throttle.

Fixed my 97 5.8 by cleaning the K&N air filter and MAF

I have 2 supercharged f150s best thing to do is clean all vacuum lines, spray tire wet on all hoses and look for air bubbles. Most hoses that are rotted will suction on throttle

The regulator increases pressure when vaccum is low to boost the fuel for acceleration, so its working properly.

Spark plug wires, new coil, new plugs then, if that doesnt do it, then its a sensor

Unplug neg battery term Turn head lights on Run a jumper cable from unplugged neg terminal to positive and wait 20 min That will reset everything

My 2002 f150 5.4 threw these codes AFTER I took it to the dealer to have my valve cover gaskets replaced. They claimed they could "fix" it for $2900.

Love my OBDLink MX especially for newer vehicles since theres more diagnostic tool available for them.

You never needed the fuel pressure regulator at all. The 4.6 and 5.4 engines run at 24 to 29 when engine is idling.. The way to know if the regulator is bad is by shutting the engine off and the rails to hold the pressure. Your lean codes are being caused by a vacuum lineleak at the PCV hose between the rear of the throttle body or a stuck open purge valve

Exactly what my car did two days, ago after I revved her up she struggle to stay idling but ran perfect while driving, all because the regulator closes while driving, and open while idling, yup had a tear in the rubber peace/plunger, when I pulled my vacuum line fuel came pouring out of there and feeding back to my intake manifold and feeding the cylinders extra fuel, yup changed this out two years ago. China junk but the thieves charges us more for these 2.00 dollars parts.

I got my fuel trims as close to 0 as possible on my 98 Ford E250 4.2 l V6 Essex engine I had to replace intake gasket cap off EVAP and PCV lines replaced leaky brake booster and use alot of fuel cleaner and MMO now it's about as best as possible

I think you should have done a intake gasket replacement job and cleaning the passages too I did that it helped a lot

Usually a fuel pressure regulator don't go bad I have the original in my van my fuel system is the return type too

Sound kinda like Art Bell late nite in Navada

Excellent content

I’ve been chasing p0171/p0174 code in a 1998 f150 4.6 liter for a month now. But the engine runs like a champ, no issues at all.

Sounds like a Hoover upright.

I don't think that will help you but go ahead put a fuel monitoring pressure gauge on there but I don't think that's going to help your problem. This problem right here is a very hard problem to chase. I've been there. I've done that. I spent a lot of money chasing it reseal the intake. Did all that still have the same code even took it to Ford. After a lot of money there still isn't resolved and they said you know what no refund they actually told me we don't design them. We just try to fix them. It seems to be a common occurrence on the 4.6 5.4. I don't think Ford could even fix it if they do. You may as well just buy a new truck when you're done because that's what how much it's going to cost you

318k nice keep her going. Got 437k on my 4.6, just got this code along with P0174 fun fun gonna dive into it this weekend.

Vac leak. Pcv hoses. Red plastic line at back of intake. Plenum o rings?

Just imagine buying a new car with a 60 or 72 month loan and after 2 or 3 years all these stupid codes popping up and you got to pay car note and insurance and buy gas and oil filters and gap insurance and pay for theses stupid codes

Yep my brake booster was hissing

very good info

fuel pump wouldnt let it run under load. You replaced it. You good. Thats not that rough of an idol from my experience. Hope it all worked out.

thank you

Having the same problem did you ever find out what it was

Use pipe tape on them fittings

I would replace my FP reg just don't really need to and I can't afford it

Did you ever pull the the battery neutral for about 15-30 mins to clear your trims and perform the Ford relearn cycle? Process is in the manual if you have it..If not, highly recommend after swapping out any air/fuel related parts & solenois.. Also check for manifold ticks (noisey lifter sounds until manifolds warm up) or any exhaust leaks before the Cats, and full EGR system, etc..Hope this (limited) info helps someone..

Change the upstream b 1 s 1 oxygen sensor

Reset pcm after everything

This video really doesnt get you any info about lean code. I does tell ya how to check out a pressire regulator

Did you hear me saying vacuum leak? Lol Your Short term FTs are not bad (single digits plus or minus). Your LTs are telling the story. High teens (+17) and when you increased the RPM the LTs normalized. Indicative of a mild to moderate vacuum leak. Next video.....the reveal please. Thanks Aaron.

I don't know what for done with Explorer in these year models through I don't know 2,000 2001-2002 minded 2002 anyway and it's got over 300,000 miles on it as well they done something right during this time not saying things will have to be fixed I mean that's just car things break down but 300,000 miles still running strong that's pretty doggone good

That is exactly why farmers no longer buy Fords Ford has lost the farmer which meant a lot. Farmers do not no longer trust Ford you cannot work on them by yourself. You have to take them into the dealership. Farmers do not make that much money. Do you know how I know? Because I live with farmers we will never buy a Ford truck ever again again. In the past it was always a Ford truck but the hell with that you have to take it into the dealership and farmers. We don't make enough money to do that. We keep America fed but we can't afford to pay forward $5,000. Every time we take our truck in there's no way Ford you need to get your act together. Seriously get it together

I have 1990 with the same problem tha

I dont understand the statemebt cant work on Fords? I mean i wouldn't buy a new ford no matter what and this is a 20 year old vehicle and very eary to work on woth 318k miles...well not easy but a lot easie than any new car. Are GM made any better? Even Toyota starting to show unprecedented quality control problems. Really its all the emissions standard ls making engines less and less reliable.