Another Ford F-150 5.4L 3v Triton Rough Idle Problem the Other Shops Couldn't Fix!

hey guys what's up welcome back to the shop once again so today we have a 07 f150 here 543 valve that has a couple different issues he's in for a timing job but he also has an issue with misfires occurring on cylinders two and four and there's no timing error codes uh it runs great otherwise slight misfire i know cylinders another shop put a bunch of uh parts on there coils plugs probably injectors everything else and the end they said we think the intake's cracked and it's leaking air into those cylinders causing a lean misfire um so he had me pre-order an intake for it but i told them these engines the 543 belt i've never seen a cracked intake in my entire career so sure enough this one does not have a cracked intake on it it's actually something very simple and it's related to the reason why i brought it in for a timing job but there's no error code set for timing so how did i figure that out well today we're going to show you what to check in this situation um that you can so you can figure it out for yourself so you're not just throwing parts there like this guy was well his mechanic was and he could save money and kind of pinpoint the diagnosis on there let's go ahead and get started all right here we go some quick diagnostics you can see this 07 has 187 000 miles on that's pretty darn good for uh original timing components on there so let's go ahead and look at the power balance on here start it up and see what's really going on they said cylinders two and four i'm not sure they had the power balance uh tool let's see what it is so we definitely have two we definitely have four but also one and three are misfiring compared to the other cylinders so one two three and four all bank one uh cylinders so there's a problem on bank one like timing or cats or something like that they're all going to be affected like this in general and sure enough they are so one three two and four uh whereas the other cylinders on bank two seem to be unaffected all right so when i had this kind of concern i go in and look at some live data on the scan tool okay so the first thing i look at is the barrel frequency the barrel frequency will tell you if the cats are plugged it'll drop drop drop if the cats are plugged because the air can't come in because it can't get out therefore for your running conditions it's not seeing as much air flow past the math drops the barrel thinks you're at a higher elevation and boom there it is so this one looks good to go should be around 156 in this area again he's from mississippi so maybe a different elevation down there but it looks pretty darn good all right the next thing i look at for a supposed lean condition due to a cracked intake would be your fuel trims of course right so we're looking at bank one and two fuel trims right there and you know bank two is you know a little out there usually it's in the positive uh but bank one is definitely it's actually showing rich so if the intake was cracked it would show lean and be positive instead of negative on here so again i don't know how they thought they had a lean misfire on this vehicle it's actually running rich according to the o2 sensors going down our mass airflow sensor looks like good to go and our short terms are hovering around zero everything's good to go there so it looks like we don't have a plug cat but we do definitely have a fuel trim issue but it's going in the other direction now why and we have cylinders misfiring on four cylinders on one bank so is it a vacuum leak or is it timing well you can simply bring up the vct error pids which will tell you how far off the timing actually is from commanded versus actual all right so you look at bank one on here this is bank one and it's off by seven and nine degrees on there all right you see how far off it is uh whereas bank two yes bank two is also having a problem but it's nowhere near as bad it's you know one to four percent looks like on there now this hover this hover back and forth is perfectly normal but it should be hovering right over zero and you can see this one's pretty close uh whereas bank two is definitely far enough off to actually cause a misfire so what's happening here is the timing on this engine is off but only on one of the banks okay and there'll be bank one causing all the mixture and everything else be wrong compression everything to be wrong on bank one only and that's why we're getting the misfires the slight misfire these are not dead misfires dead misfires will be dropped down dead misfires okay we're just getting a slight misfire because everything is kind of off on those cylinders but it's close enough to allow the engine to run so that is how i figured it out that quick you can see that you know that's that's pretty far off on there and it only takes that much seven to nine percent and it's just hovering there so it's stuck there it didn't get there somehow it's stuck there all right so let's stuck that 79 off or degrees off on that bank and that's causing all his problems it's pretty simple and again because it's so minor there are no timing error codes either okay because this generally occurs only at idle where they're off like that and they kind of correct themselves as they get actuated going down the road so you gotta know to look at this stuff look at all the basics on here to see what's actually going on and the the answer was pretty darn simple on there not only that but if there was a vacuum leak from a cracked intake on here you would hear a loud hissing noise it'd be a loud hissing noise from wherever the vacuum leak is all right so take a listen nothing no hissing at all no problems at all no vacuum leaks just by listening to it for the heck of it i did go ahead and smoke test this one through the intake port on there and there was no leaks anywhere on the intake at all sure enough so i'm not sure how they missed that one and misdiagnosed it so badly even just by fuel trims they should know it's not a lean misfire so that is all for now um at the end here of the video once i get it apart for the regular timing job it came in for i'll show you the phaser and how it gets turned in there when these phasers come apart on the early models and then they get stuck there and they cause issues like this but that's all this issue was they're trying to sell my intake and everything else and tell them all these problems and coils and plugs and guessing you need to look at the data sit here and look at the data and you can figure it out real quick so i'm gonna go ahead and tear it apart and we'll show you exactly how it looks on the inside of the engine when this is occurring all right so i had the valve covers off and the front cover off on here i wanted to show you uh the phaser how it gets cocked in there when it starts coming apart uh but it was upside down and so i went to go turn it with the ratchet here and of course that movement allowed to pop back into position and lock into the full advanced position so uh once i pull it all off the vehicle we pulled the bolt out you'll see it'll kind of come apart you'll see what i mean on there so what's happening what you're looking for on here is you see the phaser right here so here's the housing and then here's the trigger wheel and return spring so right here the center trigger right here should line up with the l you see that right there that's locked in the full advanced position now once it comes out of the position gets actuated that's when it actually moves on here and when it moves it's supposed to return back to that full lock position centering on the l what's happening with this one is cleaning apart and it's actually not coming back and that's why the timing is off a few degrees and causing it so like i said i turned the crankshaft over to put the l upright so i can show you guys better the straight on shot and of course that was enough to allow it to pop back in position so we'll show you once we get the bolt out that trigger and everything's gonna fly off of there for sure uh on this one but that's what you're looking for and that's what happens the phaser the different pieces of the phaser actually come apart and that of course affects the timing all right here we are on a test drive i just did a timing job on here i did not touch the intake you can see it's same vehicle so the first thing we're going to look at on here is the power balance so pull back a little bit and take a look at it and i'll show you the difference on here huge difference i mean you can't feel the engine running it's unbelievable and again we didn't touch the intake or anything on here run perfectly smooth across all cylinders the other thing i look at of course is the vcts afterwards so we're looking for the air pit on there like i said that hover um is normal but it must hover around zero zero percent of error on there zero degrees of error so that's normal but it must hover around zero so we have both sides fixed now and of course it took care of the issue with the bank one cylinders being slightly off and misfiring so just goes to show proper diagnosis is key here and you know even if they didn't know to go after the timing component because there was no timing error codes even if they didn't know to go for that they should still know that negative 20 on the fuel trims means the engine's running rich not lean and if we had a cracked intake it'd be running lean so well this one's all done all fixed and down the road he goes

Channel: FordTechMakuloco

Views: 306,745

Keywords: FordTechMakuloco, ford, fix, problem, repair

Id: OIh3oC5uGv4

Length: 10min 25sec (625 seconds)

Published: Sat Aug 07 2021