I have a 1990 VW Corrado and i have gone 6 months w/o driving my car.
There is black smoke coming from exhaust and loss of power, I replaced
distributor cap,rotor,fuel pressure regulator,checked fuel injectors
and their were fine,removed the supercharger cuz it was throwing oil
to the engine so i had to replace the cat converter and O2 sensor,It
doesn’t have a MAF. Can it be the ECU??

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On Feb 13, 8:26 pm, Chiquis <n... (AT) 000 (DOT) com> wrote:
Just as easily, you could have stripped the rings starting the engine
'dry' after sitting for six months. Even though black smoke usually
means that the engine is running rich, it could also be running with
the correct amount of fuel but very poor compression. Loss of power,
black smoke.

The oil-scraper (third) ring is usually the one that suffers the least
from a dry-start as it is 'right next to' the oil, so the results do
fit that scenario.

When starting an engine that has sat for any significant amount of
time, it is best to pull the plugs and squirt a few drops of "Marvel
Mystery Oil" or any thin oil into the cylinder and crank (by hand if
possible) it a bit to free up the rings, coat the piston walls and so
forth. Otherwise, you are getting metal-to-metal for the first 30
seconds or so that the engine is running... NOT good.

Peter Wieck
Wyncote, PA

"Chiquis" <none (AT) 000 (DOT) com> wrote

how's the vacuum lines on the fuel pressure regulator? leaking ones can
mess up the mixture big time by allowing too much fuel into the engine.

Not a good theory since it's common for new cars to sit on the dealers lots
for many months without being started.



<pfjw (AT) aol (DOT) com> wrote

removed the charger! There's a hose from the intake running to the ECU that
detects engine vacuum & boost. That hose must be 1meter long to prevent
issues. But on the other hand you could have other things causing the
problem. I can tell you 99.9% of the time it's not the ECU. I use to have
about 20 of them as spares from tech who thought they would fix the
problems.


"Chiquis" <none (AT) 000 (DOT) com> wrote

The car has been sitting for a while but i do turn it on once in a
while, but the thing is that it runs good when the engine is cold but
when it starts warming up thats when its starts stalling and blowing
black smoke. I had sent it to 3 mechanics and they cant figure out
what is wrong with it, but i will check the comprision. Yeah i
replaced the pressure regulator and checked if there was any vaccum
leaks, any other advise guys.
P.S. thanks for helping

"Chiquis" wrote:

Pull the plug from the o2 sensor. Could be that it's shorted which will make
the ecu think that it's running lean. The sensor is only checked by the ecu
when it's warmed up. Pull the vac. that goes to the ecu and make sure it's
not blocked. Last check the blue cool water sensor. It should have a
resistance of about 200ohm when hot.

SFC

"Chiquis" <none (AT) 000 (DOT) com> schreef in bericht
news:977441_77e39cd07106e40c2c68194b3fd56b9a (AT) 0000 (DOT) com...

On Feb 13, 10:38 pm, "Lost In Space/Woodchuck"
<newsgroupma... (AT) wildblue (DOT) net> wrote:
Two word reply (as my longer one seems to have gotten lost): Assembly
Lubricant.

Peter Wieck
Wyncote, PA

Chiquis wrote:
May seem really dumb, but are all of your grounds good? Same symptoms in
my 1.8 would indicate that the ground, especially the ground on the side
of the cylinder head, was making poor contact. Vr6 is a different
engine, but it's worth taking a look.