1998 e420 v8 is rough idling
that is called misfire, not a work argument, but is misfire
and knowing that word, helps solve the riddle.
misfire has about 4 causes?
1: bad compression on 1 or more cylinders. (burn valve?)
2: bad spark (ever the a tuneup at 60k miles or this decade?
3: bad fueling (too much or too little.
4: leaks. say coolant is leaking into a combustion chamber.
EGR stuck open, is common, if it even has one , some engine dont.
all it takes to find this is tests. and tools
got tools>? (gauges too, compression gauge, fue pressure, vacuum , timing light)
if not? the get er fixed
that is why we have mechanics, they have skills, the book and the tools.
DIY takes the same thing, or its
there are tests for every failure group, it take me about 1 hr to do it.
(after the skipped tuneup, and cures most)
In the USA, our cars are OBD2 that year, and in Canada.
So we scan all cars, first. (after the tuneup)
a scanner is like $9 off fleabay
i use an Innova 3160 , it gets the newer codes on newer cars.
if you do your own tuneup the money you saved buys the good tool.
Jun 19, 2014 |
Cars & Trucks