Appreciated 👍 very well done and good explanation very simple and to the point . I have a problem if you can help me out please , It’s a Range Rover sport 2010 3.0 diesel. 1-Starts straight away 2-engine light is on and it’s on limp mode 3- throwing code p0193 4-change the high pressure fuel rail including the sensor 5-changed map and maf sensors 6-car won’t rev past 3 7-max speed goes up to 70mph 8-drops the rev and speed when going uphill 9-sometimes on a flat road it drops the speed to 20mph and rev won’t past 2 10-recently got it services and changed all the filters including fuel filter . 11-i have got a cheap OBD scanner and saw a fuel pressure on live data it shows 22000 and it’s still won’t go up and down when rev . 12-when sudden floor the gas paddle it will drop the speed rev won’t go up it feels like fuel not coming or exhaust is blocked ,fuel or exhaust system feel squeezed .but if rev it slowly /gradually then it picks up speed until I floor the peddle but when release the paddle half way up then it feels bit of ease . 13-sorry for the very long message but I wanted some help desperately and wanted to describe as much as possible .been to land hover specialist and few other garages but no joy ,some say it’s an electric issue and some say it’s a high school reassure fuel pump and some say it’s a turbo or pcm issue but no 1 is able to figure it out exactly .. ( I have a short video uploaded as well on RU-vid ) any help would be appreciated.👍
wellcome my bro Could you let me ask you one question please? my car is Sumsung sm5 pe I cleaned throttle body and changed fuel filter, but still P0191 alarm and P0132 alarm. What should i do please
Careful with the ultra screen . Mine is on the blitz , only works when it wants . but i do have a little mark in screen that was a year old . But a good scanner
James, just had an 04 explorer 4.0 with P0193. when it got hot the sig was going toward 5v indicating about 70 psi. pcm telling fpdm to slow duty cycle to pump causing fuel starvation ,engine stumbles and dies. when cool 2.8v 38psi engine runs fine. yours went to 5v and engine kept running. you unplugged it ,engine kept running? why ?
cool. we were talking about that. mine definitely failed as an open circuit. went from good straight up to over 5v.. if you had one that gradually increased and didn't set a circuit code, we were wondering if what happened to you Would happen. that would have made a way better video. Ha
***** Unplugged you would read the 5v ref and the five volt bias voltage. If you plug it back in, you are basically loading the circuit ( thru the sensor ground ) and there is a voltage drop because of the bias circuits very high resistance and very, very low current flow, then you would know it is a bias voltage. I do believe Paul has a section in his book discussing that 5v Bias!
hey jim danner,not lame at all from where im sitting,funny what a bit of tapping and a whole lot of experiance can uncover,was good to see the 2 bros together at scannerdanner.. TNX..
Hey james how u been? i have a question big guy i been having trouble with this 2007 for f150 5.4 the truck idles perfect and runs great on till i give gas to the metal or pull a trailer and all 8 cylinders start misfiring and i just found that my scanner on pids reads 39psi on idle but i install a Gage and reads 29psi on gage but on loud it reads good wile driving is kinda hard to see the Gage but looks almost close to scanner and Gage. i already checked the MAF, cats for a flow problem, and many other things i had this truck for a month and i think im close haha only codes i get is random misfires.
James Danner I see the module but looks normal I really don't know what to look for anymore there's a tick on right side and lacks sometimes when exeleration and if I keep my foot to the metal it starts missing onther shop just did timing chains and guides 7 months ago and was running fin again after the commen problems they have
it has the vacuum mechanical part but the electrical part is just sensors. the ecm duty cycles the positive side of the fuel pump thru a pump module (usually in the rear of vehicle) based on the rail pressure sensors actual reading
ya I understand the pulsing of the fuel pump to get the correct fuel pressure. But if you got a pressure sensor and the modual is pulsing the pump to get the desired fuel pressure whats the purpose of the vacuum fuel pressure regulator? It wouldn't be needed since the pressure is controlled electronically? I worked on other makes that only have a pressure sensor. Just wondering why it has 2 ways of controlling the pressure
JOHN HUFNAGEL Probably a vacuum assisted preload spring on the backside of the diaphragm. at higher rpm/snap throttle the vacuum reduces allowing faster response from the sensor. Totally guessing though.
JOHN HUFNAGEL Great observation! I've messed with a FPR sensor on a Ford Focus before. The key is that the ECM wants to know the Fuel Pressure IN RELATION TO INTAKE MANIFOLD PRESSURE (where the injector orifice is located), not atmospheric! So that vacuum line is basically a reference pressure :) At idle, if you tee in a mechanical gauge, you will see roughly 10psi LESS pressure on the gauge than the FPR data pid! That threw me for a loop since the Focus was barely running on 0psi, put the FPR was reading 10psi...
Hey you know what's great about this video? His explanation of boring boredom monotoned Mechanic explanation not only makes me struggle to hear (the vehicle running in background is my favorite part) but his lullaby, explanation to the details that maybe use full, for other master mechanics. But for idiots like me, who try learning get more frustrated with his lack of editing and eventually mechanic with itself. Personal problem, yep. Helpful? We shall see!
maybe since it was intermittent and failed with a direct open circuit as opposed to fluctuating erratically within range. the learned fuel trims most likely didn't change drastically like they would with a real pressure problem . ..?. I'd be curious what would happen if it was totally dead for a period of time
so far everyone I saw was intermittent. if you graph it on a scan tool and walk away ..sometimes you will see the Max reading showing the 5v, so at least you know it happened, even if you didn't catch it live
my 72? or Nick's 74 that he eventually says he is putting that 355 in?. I do have a plan to show, me putting a set of old bowtie heads with monster valves...208" intakes... with some offset roller rockers and a 750 dp Holley on the 358 that is already in there. but that's prob a winter project
