People Say I'm Full of Crap About Fuel Additives, Well Watch This

today i'm going to show you how modern fuel injection cleaning systems work now i've been working on cars for the last 46 years so i've seen a lot of changes in both the cars and the gasoline that goes in them so needless to say cleaners at work 45 years ago aren't going to work that good today for two main reasons first modern gasoline has up to 10 percent ethanol in it and second many modern cars like this volkswagen have gasoline direct injection systems that often lead to carbon buildup inside the engine now if you're using an old-fashioned additive like sea foam it doesn't have the additives that are going to work with alcohol and with gasoline direct injection systems all that well it's called seafoam for a reason it was originally used for two-stroke outboard motor engines but today even most outboard motor engines are four-stroke engines so if you want to keep your engine and fuel system clean you need an additive that can work with four-stroke motors and with gasoline it has ethanol in it now the naphtha and the pale oil that's inside the seafoam works great on two-stroke motors they need oil in the gas anyways to make them run but if you're driving a modern car especially if it has gasoline direct injection and the fuel has a lot of ethanol in it you need an additive that's made just for that a modern car with modern gas not an old motor boat engine now the main cleaning ingredient in the gum out is polyethylamine or pea it's a nitrogen-based cleaner when you see those signs at the shallow gas station that say nitrogen power it's the same stuff that they're using it'll clean the inside of your engine really well especially if you have a gasoline direct injection where the carbon buildup often occurs if you don't have enough cleaner and it also has corrosion inhibitors so when you pour it in a gas tank it keeps the ethanol and the gasoline from corroding your system now i've had a lot of complaints from my own customers saying they hate that gasoline that has ethanol because it makes their cars run poorly it can't actually corrode stuff but if you have anti-corrosion inhibitors in it it won't hurt your car now i know some people are going to say hey why should i listen to that guy what does he know what he's talking about well actually i don't believe what most people tell me either so you can do what i do use the stuff and test it i use my borescope to look inside the engines once you take a spark plug out to see if the stuff's actually cleaning you don't have to buy a real expensive one you can get them for 80 or 90 bucks nowadays they're all made in china just do like i did take out a spark plug just put it in a hole and look inside before you use the cleaner then run two or three tank fulls full of gas with a can of this stuff in and then check it out with a bar scope again to see if it's clean here's a before picture with the piston all clogged up with carbon and here's the later picture where you can see it's much cleaner so if you're like me and you want your car to last forever you might try some of this gum out multi-system cleaner now here's an oddball one we got a 2007 toyota corolla and it doesn't run right it accelerates very sluggish and the weird thing is he took it to various dealers and they all said they can't find what's wrong with it so let's see if they were screwing them around or whether it's something that even i can't figure out now theoretically it's had spark plugs air filters everything out and i don't trust anybody but i'm going to start by checking the battery alternator many problems can be created by lack of power from the alternator battery so cheapest battery you can get from autozone check the old battery since it's not a very expensive one who knows now it says 520 cold cranking amps so set it up for that in vehicle battery post top post regular pro cranking amp got to put it way down to 520 and let's see what it says good battery okay now we'll check the alternator so starting up that's working fine so we know it's getting correct voltage to everything now let's just take a general overview of the engine but sure they weren't lying about the air filter oh that's clean okay all the hoses are hooked up there's no loose hoses anywhere it's all on so we'll take the stupid beauty cover off everything looks pretty normal so far so let's check out a spark plug we'll take the number one out that's the one in the front of the engine they don't give you enough working room so you got to pull the wire off and that's always fun on these you got to squeeze and pull there we go all right that's out of the way oh get a spark plug socket pull out the spark plug and we'll examine it pretty much normal color grace there's no suit or anything on it so we'll measure with feeler gauges it's 44 thousandths of an inch if the gap was wrong it can run wrong but it's gapped right and it's running fine so there's nothing wrong with that so we'll put this back together nothing obvious showed wrong so we'll plug in the scan tool see what it says it's reading all the information now it knows what it is so we'll do a network scan this baby's only got hundred and eighteen thousand that's not much for a toyota corolla now it does have one failed module let's see what it is it has a crowd for failed engine immobilizer system well that can't be making the car not accelerate right that's immobilized system that in the key the chip in the key has to match the computer if it doesn't the car will not start the starts it just has no acceleration so that's not the problem so we'll switch over to live data in this case you're better than a computer the computer hasn't found any failure but it doesn't accelerate right the computer's only going to trip code sometimes it has to go as much as 25 plus or minus the normal data which hey if it's 23 you can feel it running poor but it won't trip any coats we're going to start looking at the data short term it's subtracting fuel but long term it's adding fuel it's odd because the fuel trim is kind of squirrely let's try to figure out why look at the spark advance rev it up a little well that's working goes up when you accelerate and goes back down when you go back to idle taking a while to get back down but that's because this i got all this data and the data isn't going to refresh fast enough in this case the maf sensor 2.03 grams per second how you really want to test it is turn the ac off put it in drive and see what it does now it's idling it's saying 2.39 grams per second 2.34 this is a 1.8 liter engine it should be reading closer to 2 or 1.8 than 2.34 now one thing that can cause loss of acceleration and weird fuel trims is a clogged catalytic converter so we got a gauge we're gonna take out an oxygen sensor and see if it's got too much pressure if it does the catalytic converter is starting to clog up as we look down conveniently there's an oxygen sensor right here we got an oxygen sensor socket we're gonna remove it they're usually pretty stocked i'm gonna use a real long bar extension bar to get it loose they're close but we can unscrew it take the socket off now put it up here we'll unscrew it and you can see the sensor is pretty new they tried a new sensor and it didn't fit but did they test it i don't know we're gonna put in the oxygen sensor tester then we'll tighten the socket to make sure it's sealed right you gotta have it tighter you won't get the right pressure reading now it's nice and snug you can screw the gauge in and now you can see the gauge is hooked up and we'll start the car start it up give it a few revs [Music] and we see it has no pressure at all now we'll rub it up and see if it changes as you can see the gauge moved a little but it means nothing if you have two and a half three four five pounds pressure the cat's clogged up but this stays pretty much at almost no pressure at all meaning the exhaust system is free and it's not restricted so it's not that we'll remove the gauge in a socket adapter then i'll use my magnet to pull it out i use a magnet so i don't burn my finger so i'll blow into this one and you can see it moves i blew in it so the gauge is working fine so now we're bringing out my big boy my otc high level scanner see if it gives us more information we can use since the mav sensor's already been changed and then it's got an impedance one the correct one for the car it's not that he said he had the map sensor chance it made no difference it still ran poorly let's see what bosch has to say go to diagnostics auto id i'm gonna do all the mode 9 data and mode 6 data it's a much more specific machine so we get a lot better information start it up and do data streams since we're having problems with the running we're going to do engine transmission now we'll start with all data items just to get a general overview now as we look the long term fuel trim it's adding fuel so long term it is running rich even though now the short term it's actually subtracting a tiny amount of fuel the ignition advance is 14 that's normal we'll rev it up goes back up and we let go goes back down you notice how the previous scan tool took a while for the ignition timing to go back down because it's a cheaper tool this bosch one is much better it refreshes quicker hence when we took our foot off the gas it went back to normal timing like it's supposed to fast not the car that's doing it that was a scan tool differential looking at the rest of the stuff got to refresh the screen now and when you can see it idle it's 1.96 2 grams per second that's normal at idle now when we bring it up to about 2500 rpm in neutral it should read about seven grams per second we'll get it up to 2500 there it is so it's reading right there i got it down a little it's hard to keep it up but that's working it's going up and down like it should now that is a new toyota nippon denso mass airflow sensor but you can't trust anything i tested it that's worked let's check the air fuel sensor the monitor sensor two bank one sensor two bank one sensor one all right we're gonna check that stuff as you can see the one that we checked before the air fuel sensor bank one sensor one that has voltage but the bank one sensor too it's not changing at all there it is it goes zero it seems to be lazy rev it up it's not moving like the other one eventually does so we might have a lazy oxygen sensor but let's go further now looking at the fuel system we got a long-term fuel trim that's adding so it's running slightly lean now it shows no misfires at all so this is a real quandary it's running just slightly lean i'm guessing the fuel injectors are just kind of old and worn a lot of times you can clean them and try some of this royal purple throw it in a gas tank and see what happens got the nice funnel so it fits right in so in this case the funnel got stuck so you got to stick your finger in and then pull it out well isn't that just to catch me out there there it goes you can always wiggle him out i'm gonna start her up go for a good half hour drive and we'll leave it in second gear so it'll rev higher and burn quicker let it tick at about say 4000 rpms for about half an hour of driving while we're driving around now so let's check the fuel trim now and you can see the long-term fuel trim has gone to point eight percent that means it's only adding a tiny amount of fuel instead of about five percent it was adding before so it's fixing it now that was only a half hour drive as you drive longer it can even do a better job dirty fuel injectors seem to be one of the biggest problems in this vehicle now you know something as dumb as slightly dirty fuel injectors that don't spray enough fuel or don't make the perfect conical shape can make your car hesitate when you try to take off so if you never want to miss another one of my new car repair videos remember to ring that bell [Music] you

Channel: Scotty Kilmer

Views: 3,333,324

Keywords: auto, auto repair, car, car diy, car repair, cars, diy, how to, mechanic, repair, scotty kilmer, car review, fuel cleaner, what type of fuel cleaner, cleaner fuel, fuel system cleaner, fuel treatment, fuel additives that work, fuel additives for cars, how to use fuel cleaner, do fuel cleaners work, do injector cleaners work, fuel additive testing, fuel system additive, do fuel additives work, does gumout work, fuel, additive, fuel additive test, how to clean fuel injectors

Id: IZMKcbC0rTs

Length: 11min 30sec (690 seconds)

Published: Thu Sep 30 2021