It's not inherent, it's a side effect of more than one manufacturer
running their system much too rich in an an attempt to meet US NOx
For at least one model engine I know of, using the European version of the
ECU software with their fuel map causes the oil diution issues to go away
(and the gas mileage and performance are probably improved as well).
(who drove the car with the Solex carbs to work this morning)
"C'est un Nagra. C'est suisse, et tres, tres precis."
The real issue w/ DI cars that I've seen - and I have one, and am
thinking that I may need to address this - is that because there's no
fuel washing the back of the intake valves, the backsides of the intake
valves are far more likely to get all sorts of carbon deposits on them,
and there's no "pour it in the tank" cleaner that will get rid of them.
The fix is to pull the intake and walnut blast the valves and ports.
The "real" fix is to install a catch can in the PCV line to limit the
oil in the intake to the amount that seeps past the valve seals.
replace "roosters" with "cox" to reply.
I've heard that but it seems that either a) I got a good one or b) it
was mostly resolved by 2009 as mine as of today now has something like
73K miles on it on the original HPFP and still pulls like a freight
train (I put something like 700 miles on it over the past few days, and
I can't count the number of times I hit and blew past the 80 MPH warning
chime that I set - primarily to keep me pork friendly in VA - while
passing other motorists on 2-lane roads. A simple tip of the right foot
and it gets to Ludicrous Speed quite smartly, even in top gear...) I do
have a Cobb AccessPort and can therefore check for "shadow codes" and
will keep an eye on them, but so far (touch wood)
Ah, but then I'd have to Work On It Myself, which would defeat the
purpose of buying the thing in the first place. I just wanted a car
that I could enjoy driving that I didn't actually have to build myself
for once. I think that I've already knocked out all the required
maintenance save for I probably ought to replace the spark plugs (just
got the special thinwall deep socket in the mail the other day) go ahead
and add the catch can, and change the gear oil in the transmixer and
rear end. And the navigation needs to be updated, but I was waiting for
the 2013 updates to come out (they just did.) Other than that, it's,
well, 100% functional. I suppose I could wax it.
That, and I'm fundamentally a coupe sort of guy. I would trade the new
hauler in a second for a nice 3.0CS(whatever) as bad an idea as that
would be from a practicality standpoint.
replace "roosters" with "cox" to reply.
So? Why does that matter?
In the continuous pursuit of ever-vanishingly-tiny gains in safety,
mileage, and emissions, cars are increasingly becoming laboratory
experiments rather than practical utensils.
Direct-injection is just one more angels-on-the-head-of-a-pin theory
brought to life. It's expensive, it's complicated, it's impractical.
And...so what? It allows the politicans, activists, and bureaucrats to
indulge their onanistic fantasies of doing nice things for Mother Gaia, and
at /your/ expense. What more is required?
you're right that it's political, but you're wrong [as usual] about the
[real] activists and their intent - in this case, they're working /for/
the oilco's, not against them.
back in the 70's, car manufacturers were [successfully] introducing lean
burn vehicles [remember the honda cvcc tegger?] that offered
considerably better fuel consumption, and this was a big business model
threat that the oilco's took personally, and set out to kill. by
[brilliantly] getting NOx emissions onto the environmental statute
books, car manufacturers have been stuck with stoichiometric combustion
and thus much higher gas consumption than lean burn.
the battle continues. NOx emissions statues aren't going to get
repealed any time soon. but with d.i., you can burn a region of
stoichiometric mixture within the cylinder where the fuel is delivered
and richest, and the rest is basically just fresh air and doesn't
contribute to excess NOx in the way that a full cylinder of lean mixture
would. it's a very smart [and low cost to manufacture] means by which
to achieve better economy while still complying with the convoluted and
unrealistic emissions regulations that are designed to keep cars sucking
gas like the behemoths of yesteryear.
as usual, you're full of it. #1 cause of intake valve deposits are hot
valves causing the fuel that is directly sprayed onto them [and its
heavier constituents] to carbonize. just like that black crust on your
cast iron frying pan is caused by carbonization. "washing" only works
if there is a gross excess of fuel, which there isn't after the engine
has warmed up, and a high detergent content.
for you to be getting deposits means:
1. your engine is "puffing" back because of valve timing overlap and a
motor being used with too wide throttle at too low rpm,
2. you're using cheap crappy fuel,
3. because it's just a worn out piece of crap.
since 2 and 3 are right in your wheelhouse, and we know you're generally
incompetent, i'd say you're "lugging" the vehicle, and having a problem
with 1 as well.
3/3's not bad for an idiot monday.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.