Doing This Will Make Your Engine Run Better

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06:28   |   Apr 10, 2019


Doing This Will Make Your Engine Run Better
Doing This Will Make Your Engine Run Better thumb Doing This Will Make Your Engine Run Better thumb Doing This Will Make Your Engine Run Better thumb


  • rev up your engines, today I'm going to show you how to fix a car in this case
  • of this lexus when a bunch of trouble lights come on in the dash, in this case it's got the
  • check engine light it's got track off, maintenance required, check vehicle
  • speed control, and this giant one here that just tells you warning something
  • wrong as I happening so we start with a simple thing, we plugged the scan tool
  • under the dash in this case it just goes onto here and plugs right in here then
  • they have the key on the on position with the lights on, but the engine not
  • running, then we let the scan tool do its thing it takes a minute or so and lo and
  • behold this baby's got 14 different codes now the first thing we wanted to
  • do is look at the P codes those are the codes that have to do with the
  • running of the car, it's PL 171 174 then 1 7 174 which then we know those are
  • real serious codes then there's the C codes, now we're going to
  • start with the P codes because the P codes
  • will make this vehicle not pass the state emissions test, the customer wants
  • it to pass the emission tests, he knows it's an old car it's almost got 200,000
  • miles on it he wants it so it'll run decent and pass the emissions test and I
  • know for a fact on these lexus says they have strange software all the Toyotas do
  • that if you get a P code the check engine light comes on but often that
  • turns the traction control system off automatically by software, so you get the
  • track off light in this case there probably isn't a failure in the track
  • system, it's just the check engine system is making that trip the code, now this is
  • a v8 engine so it's got number one side and number two side but both sides are
  • running lean they either have too much air or not enough fuel let's hope it's a
  • vacuum leak something that's relatively simple to find, but I'm not all that
  • hopeful it's going to be a vacuum leak and here's why, I looked at the freeze
  • frame data and it shows that the P0 one-seven-one code occurred at 63 miles
  • an hour and then I checked the pl 174 code it also tripped at 63 miles an hour
  • so the code tripped at a relatively higher speed vacuum leaks affected engine the
  • most at low speeds when the engines barely going you got a vacuum leak
  • that's gonna affect the air fuel ratio a lot more when you're going slow than
  • when you're going fast normally with a vacuum leak you'll get the freeze frame
  • data showing the car was going slow but if there's a problem in the fuel system
  • itself not sending enough fuel that'll generally hurt her at a higher
  • speed but we're gonna check for broken parts anyways you never know what could
  • have come off or gotten loose, so we'll take the stupid cover off it and as I look
  • around there's no obviously broken hoses or connectors, so go to the air filter
  • assembly check that, get the clips off and welcome take it out not much working
  • room, it does have a leaf in it but it's pretty clean that's not a problem, but
  • this mass airflow sensor it could be dirty, so let's take it off
  • they're often hard to take off so I get a long pair of pliers squeeze it try to
  • pop it off it can be a real pain in the butt, then we unscrew the thing
  • to a little screws they often stick so push down real hard you don't want to
  • strip them out, there it comes, now these sensors can often get dirty I can see
  • there's a reasonable amount of dirt on the little part here and then there's an
  • inside part so we're gonna clean it, and when you do only use mass airflow sensor
  • cleaner, you just spray it that's cleaning the part that you can't see
  • turn it over, spray it then there's stuff inside, you spray that one way and then
  • the other you want to get it nice and clean, then you want the thing to air dry
  • for about half an hour, you don't want any residual stuff to be sucked in, or any
  • cleaner left on here, this stuff evaporates off, doesn't leave any residue
  • that's why you have to use the mass airflow sensor
  • don't use carburetor cleaner, then after half an hour put it back in
  • and put the screws in the holder place then plug the connector back in never
  • clean up with the connector in, you don't want any power going to it when you're
  • cleaning it, it snapped to cover back on and put the stupid beauty cover back on
  • then, we'll take you for a spin, we know the code came on at 63 miles an
  • hour, so we're gonna go drive at 63 miles an hour, well here goes nothing well
  • let's hope it's something, and I've also reset all the lights so all those warnings
  • that were on before are all gone, now you're do want to go for a good 20 30
  • minute road test to really run it through to make sure it's testing
  • everything, well now the road test is over and all those nasty lights haven't
  • come back on, let's get the scan tool and see what it says
  • it's doing its thing, look at that now there's no codes at all, even though we
  • didn't work on the traction control system the code didn't come back because
  • as I said in these things if you get a check engine light come on, that will often
  • turn the ABS off it'll turn the traction control off, even though there's
  • nothing wrong with those systems it's a software thing, that if the car isn't
  • running right it won't let it operate those systems, so now thanks to the Handy
  • scan tool and the ability to have freeze frame data, you always want a scan tool
  • that can record the freeze frame data, so when there's a trouble code it'll show
  • you exactly when it occurred and all the data that were around then when it did
  • occur to fix it right, because as a warning to anyone, when you get an old
  • car like that fixed and it's ready for inspection, take it in and get it
  • inspected, cuz you never know what some other electronic thing is gonna go wrong
  • and if it runs fine and it's got a little light on, what the heck you can
  • drive at another year until its inspection time again, so if you never
  • want to miss another one of my new car repair videos, remember to ring that Bell!

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Doing This Will Make Your Engine Run Better, DIY life hacks and car repair with auto mechanic Scotty Kilmer. Life hack that will make your engine run better. How to make engine run like new. How to make engine run smoother. Engine running lean. How to fix a lean engine. Engine problems and engine repair. Engine life hacks. Car Advice. DIY car repair with Scotty Kilmer, an auto mechanic for the last 51 years.

⬇️ Things used in this video:
1. CRC Mass Air Flow Cleaner: https://amzn.to/2KqijPs
2. Common Sense
3. 4k Camera: https://amzn.to/2HkjavH
4. Camera Microphone: https://amzn.to/2Evn167
5. Camera Tripod: https://amzn.to/2Jwog8S
6. My computer for editing / uploading: https://amzn.to/2uUZ3lo

⬇️Scotty’s Top DIY Tools:
1. Bluetooth Scan Tool: http://amzn.to/2nfvmaD
2. Cheap Scan Tool: https://amzn.to/2D8Tvae
3. Basic Mechanic Tool Set: https://amzn.to/2tEr6Ce
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