[Vwdiesel] Limp mode

[Shalyn Shourds]

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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