rev up your engines, today I'm gonna show you how to fix a car that's idling
incorrectly this Mercedes runs okay going down the road but when you come
to a stop it's shaking wiggling too much you can tell it's not running right but
it hasn't yet trip to check engine light and being a professional mechanic I hope
my giant $5,000 can tool up and found 56 different codes none of which are
related to the engine idling their anti-lock brake codes communications for
the airbag cause lots of weird stuff but nothing that would make it run weird so
we got to start from scratch here Ilene is the most crucial part of your engine
when it's working correctly because everything has to be perfect it can be
off a bit when you go in fast it's still run okay but when it suddenly it's got
to be perfect you got to have the right amount of air the right amount of fuel
and the right amount of ignition power to the spark plugs to make the engine
right so all we start with the basics bar second we have checks the air filter
take all this plastic stuff out of the way in this case it has two air filters
one on each side and of course being a Mercedes Benz it had to use one of these
stupid fancy sockets in this case TP 20 sockets so you unscrew all the stupid
bolts that hold it in place, they got a little carried away here and they're
filthy so we're gonna change them now this baby has two spark plugs per
cylinder it's a v8 so it's got sixteen spark plugs so let's check the spark
plugs soften here impossible to get these off so we'll have these pliers
stick them in and wiggle them, then we got one off then we use the spark plug socket and see
what they look like hard to get out they probably been in here a long time
babies are in there finally and as we can say there's a lot of corrosion on it
these babies have been in a long time so we're gonna change them out well we
gotta do 16 of these things what a pain in the butt
mercedes-benz under designed for dry dad dual spark plug years ago and that gave
up with it heck they even use that stuff in World War 2
they may think they're high-tech but they're still pretty low-tech when it
comes to a lot of things like that old-school, get them nice and sung
get up and then a little tug, then you snap the wire back on sometimes it's hard to
find not much working room huh now to get to the rest of the sparkplugs
you gotta unbolt the coil pack here so you can reach them otherwise there's no
working room so you're unbolt all the coil packs and get them out of the way
now of course once you've done that eight on the one side we got to do the
eight on the other side this baby is a pain in the behind but at least is
exactly the same the spark plugs in all 16 of them and the coil as long as we're
here let's look around for any vacuum leaks this thing is 15 years old looking
for cracked plastic parts you can see the vent crack stops done JB welded back
on a lot of plastic stuff break on these old ones but we're looking for vacuum
lines and stuff that might have cracks or the rubber that's leaking well I
don't see any on this 97 degree heat I'm just gonna put the filters on start it
up and see what happens filter just goes back in screws on this side line them up
and bolt the stupid things back guys awful long threads on these baby and
this one seems dirtier than the other one then you slip the whole thing back
on one there super beauty here we go he comes to a stop and it's idling smoothly
the silk all the shaking is gone so now you know how does a shaking car from
doing the shimmy while you're idling a lot of sweat not a little elbow grease
you can do it yourself easily, so if you never want to miss another one of my new
car repair videos, remember to ring that Bell