[Vwdiesel] Limp mode

Wed Jul 29 00:02:01 PDT 2015

I bought a used one for a project and overall, cleaning it wasn't bad (of course it was off and on 
the bench).  I did pull it apart a couple more times to clean/polish the movements of it.  I felt it just 
took too much effort to move it.  But then mine had been sitting and was a bit corroded.  Getting yours off is probably the hard  part.

  IIRC Andrew has a tutorial on them, which is what I used when tearing into mine.
  What's the noise?
Noticeable reduced power has always been limp mode in our cars.  Runs fine in limp mode, just doesn't have the power.  Doesn't seem to get quite the mpg either.
    Loren

-----Original Message-----
From: Shalyn Shourds <tippedcows.spiltmilk at gmail.com>
To: pmdolan <pmdolan at sasktel.net>
Cc: vwdiesel <vwdiesel at vwfans.com>
Sent: Tue, Jul 28, 2015 7:10 pm
Subject: Re: [Vwdiesel] Limp mode

Been too busy/exhausted lately to think about the car.  Sadly, I'm
probably
going to have to rent (a gas) one for my upcoming trip.  No limp
mode
lately, but still noise and reduced power. I've ordered an N75 and an
MAF.
Not super expensive and easy to replace.

What was your experience cleaning
the turbo vanes?  I've read summaries of
techniques including oven cleaner.  How
was getting the unit off/on?
Really tight back there.

-Shalyn
On Jul 16, 2015
6:18 AM, <pmdolan1 at sasktel.net> wrote:

>  Pretty sure the MAF would throw a
nasty big code if it was not doing its
> job.  Also, think N75 does as well
(only had that happen once, can't
> remember what VAGCOM said about it)
>
>
>
>
I have had vanes stick in ALH, and it does exactly as you have described.
> 
Cleaning them is probably job one.  This happened with N75 failed and
> engine
was smokey for a few days - thus sooted vanes in VNT 17
>
>
>
> Pat
>
> On Wed,
15 Jul 2015 22:18:02 -0500, Shalyn Shourds <
> tippedcows.spiltmilk at gmail.com>
wrote:
>
> While looking at the vacuum lines, I moved the big line to the
vacuum
> booster to check for leaks. I didn't find any, but I must have
re-seated
> the hose ends because it's not perfect, but it is better. It's at
least
> driveable, so it's likely the vacuum wasn't enough to run the turbo or
the
> brakes.
>
> I may go ahead and replace the MAF and/or the N75. I really
should check
> over the turbo vanes and replace all the relevant gaskets. I see
that
> there are people who have pulled apart and cleaned the turbo. Anyone
dove
> in there? Dreading pulling the unit and the manifolds more than
anything.
> If anything because it's 100ºF out there.
>
> -Shalyn
> On Jul 15,
2015 8:03 AM, "Hayden Chasteen" <dieseltdi at verizon.net> wrote:
>
> > Going imto
limp mode could be caused by a number of things, sticking
> turbo
> > vanes
causing an over boost, bad N75 valve, bad vacuum/boost lines but if
> > you are
loosing brakes also, I might suggest the vacuum pump. Just some
> > thoughts.
Hayden
> > > On Jul 13, 2015, at 1:54 AM, Shalyn Shourds <
> >
tippedcows.spiltmilk at gmail.com> wrote:
> > >
> > > 00 TDI. I've been losing some
power lately and then last week it went
> > into
> > > what I'm pretty sure is
limp mode. I had it floored and was losing
> speed
> > > on a slight incline. It
was more or less back to its usual somewhat
> > > diminished power after a
restart. It has done that twice now. No codes.
> > >
> > > I replaced almost all
the vacuum lines. The one from the pump to the
> > brake
> > > booster was
surprisingly not cracked. That didn't help. I do have a
> > high
> > >
whine/whistle that may be turbo related and I have very rarely lost
> power
> >
> brakes if I use them in rapid succession.
> > >
> > > I checked earlier and
had 15 inches of vacuum at idle. Stomping the
> > brakes
> > > repeatedly in the
driveway would drop the vacuum, but I would think
> > that's
> > > normal.
> >
>
> > > I'm researching quickly, but have a long ways to go before I
understand
> > the
> > > vacuum controlled system and how that interfaces with
the ECU. I
> > probably
> > > need to pull the turbo and replace the surrounding
gaskets, but I, like
> > my
> > > car, haven't had a lot of energy lately and am
trying to figure out
> > what's
> > > going on before I use up my limited energy
wrenching on parts that
> aren't
> > > broken. Troubleshooting me is sadly in
the hands of &$@# doctors.
> > >
> > > I'd appreciate any advice on what
direction to look. I have a VAGCOM,
> > but
> > > haven't learned much beyond
pulling codes.
> > >
> > > -Shalyn
> > >
_______________________________________________
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>
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> >
everything to life. Evolution in nature is not inconsistent with the
> notion
>
> of creation, because evolution requires the creation of things that
> >
evolve.” Pope Pius XII
> > “There are many men of principle in both parties in
America, but there is
> > no party of principle.”
> > “I do not know if the
people of the United States would vote for superior
> > men if they ran for
office, but there can be no doubt that such men do
> not
> > run."
> > “I cannot
help fearing that men may reach a point where they look on
> every
> > new
theory as a danger, every innovation as a toilsome trouble, every
> > social
advance as a first step toward revolution, and that they may
> > absolutely
refuse to move at all.” Alexis de Tocqueville
> >
> > Proud owner of:
> > 2014
Jeep Grand Cherokee Ecodiesel
> > 1968 Beetle
> > 1982 VW Jetta Coupe GTD
"FrankenJetta"
> > And many, many, many VWs; from a 1947 Beetle (13 Beetles
total), to Vans
> > (5 - 3 splitties 2 bay window (both were campers), 1 Vanagon
Westy,
> > Rabbits (3), Karmen Ghia (1), Jettas (11), Passats (2), Dasher (1),
New
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>
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