rev up your engines alrighty here we have a Toyota that just came over it's
smoking under the hood and the check engine lights on so let's figure out
so let's open it up and plug in the old scan tool all right it's got code p0171 system too
lean so it's running too lean which is often a vacuum leak in the
freeze frame data we can see that this lean code tripped when the vehicle speed was
zero so what happened when the car wasn't even moving which is almost
always vacuum looks on now we'll try to figure out why it's smoking under the
hood well we're smoking on the backside here
so let's take this plastic crap off and look inside come off comes the plastic
cover do two things anyway they don't do it yeah we're going ahead and get them
off as we look around we can see there's a ton of oil right here dirty old oil
how'd you can see here the valve cover gaskets leaking then it gets on the
exhaust so we're gonna change that yeah when you look closer on the front you
can see the oil is leaking all over here from the valve cover gasket to so we'll
take all the pieces off to get the valve cover off while we're at it we'll look
for vacuum hoses in a cracked really cuz that'll often trip a lean code where
it's sucking air start with all the holes is that are in the way then go to
the back side
yeah well disconnect all the ignition coil assemblies and remove the wiring harness out of the way
when we'll take each one of the coil off the bolt just comes off here comes the coils
put them up here and we'll do all four gotta get them out of that room
the little bolts that hold the valve cover on it's all bunch of them okay
bolt off and don't forget the ones hiding down here I got hitting all over
the place they get a little pry bar and pry it up
eventually the stupid thing comes off then you
can see the old brittle gasket comes off then wipe all the corrosion off the edge
of it so it's nice and clean because you want a nice shiny surface to put the new
gasket anything in the way pull it off and clean if off all shinny
and get the new gasket set and the spark tube seal then you slide it all
in and push it hard and this is really all car so I'm gonna put a little 3m
gasket sealer around a two because these old ones have a tendency of
leaking unless you do that this stuff works great I like the black stuff you
just squeeze it all around the whole thing what an artistic job don't with
the seals on the top in place you flip it over carefully placing on
wiggle everything around there's not much working space on it goes the tighten
the ten millimeter bolts in start in the middle and work your way out don't
forget the back ones they're hidden away but their in there make them finger tight
then start in the middle with the ratchet and make them all nice and
tight then put all the hoses back on then put the ignition clothes back first
get them finger tight then finish them off with the ratchet then plug the
ignition close in and for now if you remember had it running to lean code so
I checked them there's no hoses that it come off so I'm gonna change the PCV
valve if they leak they'll often suck air so we're gonna change that too
because if the PCV valve sticks open it's up there then it runs link this is
job on this car, they sure stuck it on this car, you'd never get along
without the socket that's for sure now I can finally at least using my hands
they got carried away with themselves in this one how it comes then we'll put the
new one in these disease you're putting in there is getting it up try to twist
it could've been a lot shorter they kind of got carried away themselves now it's
getting snug so we'll finish it up and put the hose back on come on put the stupid
beauty cover back on it lines up with these holes it's always a fun job
then close the hood and start it up
so if your car's check engine light is coming on and the car smoking under the
hood you know how to fix it yourself, so if you never want to miss another one of
my new car repair videos, remember to ring that Bell