[Biturbos4] Detecting "limp" mode?

Chris Newbold chris at newbold.org
Thu Mar 13 13:17:00 PDT 2008

On Wed, Mar 12, 2008 at 8:53 PM, Joel Liggins <quickaudi at gmail.com> wrote:

>  Last time you cleaned/oiled your Bailey DVs?

Uh, never. They've been in there about 18 months or so, maybe 15,000
miles on them. What's the recommended maintence interval and procedure
for these?

>  Have you pressure tested for boost leaks (Samco doesn't mean you haven't
>  blown a hose off)

I have not done an explicit pressure test, but the fact that I
observed this behavior prior to the installation of all the Samco
hoses and that there was no change following the install pretty much
says that there isn't a leak from one of those hoses. (The host
install was done about 2500 miles back.)

Now of course there could be a leak somewhere else, in some vaccum
lines or other control plumbing...

>  What maintenance have you performed in the last 60k miles? (spark plugs, air
>  filter, clean throttle body, fuel injector cleaner, etc.)

Spark plugs, timing belt, water pump, intake hoses, air filter, etc.
(the "full monty") about 2500 miles ago. The boost issues predated the
service and appear to have been unaffected by the service. I ran a
bottle of Techron prior to the service.

>  Limp mode doesn't necessarily mean you'll get a CEL.

Good to know. Is there a particular measuring block in VAG-COM which
will indicate whether the ECU is in "limp" mode?

>  Have you found any codes via VAGCOM?

Just a couple of mis-fires.

>  How many miles on your car?  Some seem to have had wastegate line issues...

About 83,000.

>  Are your EGTs stock?

Stock and still original.

2001.5 S4 Avant 6spd

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