Subject: Power fall-off above 1.5 bar

[Adam Gratz]

>
> David-


Fuel pressure regulator checked? Is it original?

You need to blink out the codes. Remember the engine speed sensor code will
show even if it is functioning, since the flywheel is not turning.

I agree, swap out a known good MAF.

doc-

>
>
> Today's Topics:
>
>   1. RE: Power fall-off above 1.5 bar (Schaible, David)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 26 Jan 2009 10:54:30 -0500
> From: "Schaible, David" <David.Schaible at jrspharma.com>
> Subject: RE: Power fall-off above 1.5 bar
> To: George <sidman at webloq.com>, "200q20v at audifans.com"
>        <200q20v at audifans.com>
> Message-ID:
>        <E56C7D8AA050A149989647FBB0450174230DDC63 at jrsph9.JRSPHARMA.PVT>
> Content-Type: text/plain; charset="us-ascii"
>
> I have had this on & off for 10 years.....MAF sensor, and boost leaks were
> usual suspects.  I would pressurize system to 2.5 bar and check for leaks
> first.
>
>
>
> David Schaible
> JRS Pharma LP
> 2981 Rt. 22
> Patterson, NY 12563
> 845.878.8343
>
>
>
> -----Original Message-----
> From: 200q20v-bounces at audifans.com [mailto:200q20v-bounces at audifans.com]
> On Behalf Of George
> Sent: Thursday, January 22, 2009 9:28 PM
> To: 200q20v at audifans.com
> Subject: Power fall-off above 1.5 bar
>
>
>
> My '91 200 Avant is having respiratory or fuel problems above about 1.5
> bar.
> To cut to the chase, I had the turbo rebuilt about six months ago, and the
> car took off like new, pulled1.8 bar and all was glorious, recently it has
> started stumbling and loosing power above 1.5 and we are having a hard time
> diagnosing the problem. New parts include the WGFV, coil, fuel pump, fuel
> filter, cats, cap, rotor, wires and plugs, and all the vacuum hoses.
> Yesterday we detected a bad engine speed sensor, and turbo over-run sensor,
> which have now been replaced. Same problem.
>
>
>
> I have a very good wrench on the job and he is frustrated. He has confirmed
> full vacuum, no leaking injectors or fuel regulator, good spark, fuel
> pressure, and that the upper and lower intercooler hoses are good.
> Alternator output is on spec. Diaphragm in the waste gate is good. Car
> starts right up and runs perfectly until it gets up to 1.5, and will
> continue to try to build boost, but starts stumbling. So, we can rule out
> limp-home mode from the ECU.  The check engine light is on.
>
>
>
> Any sage advice, ideas, or whacky thoughts most appreciated....  Something
> is getting by us here.
>
>
>
> George Sidman
>