hesitation / bog down

[hayes myers]

Having loose vacuum hose lately (wastegate etc) i see where this might be an
issue.  Steve's comment is timely as i do suffr from decel issues...and the
lag/dying feeling only happens when i'm at speed on the hwy (well..it only
manifests itself I mean to say) where i'm dong ~70mph with very light
throttle (perhaps lifting off that light throttle even) which might be
creating the sticky de-cel issue Steve mentioned.  And yes..i think i'd
solder anything vs spend money. I'm learning. With my 05 A4 it was how much
you got to spend...with the 91 200 it is..how cheap can i do it :).  so
..lots to check. I have injector o-rings and plugs to put in this weekend as
well.  I can't wait to see how much better this tub runs with more
'fixes'..it seems to run better and better..
Have a great weekend all!

On Fri, Dec 11, 2009 at 3:06 PM, Andrew Dickinson <amdickinson at rogers.com>wrote:

> Sounds like a vac leak to me... like Bret said, a BPV is essentially a
> closed loop around the compressor.  leave it open all the time and boost
> bleeds off.  gives a similar problem to AF that leaking vac hoses do.
> ----- Original Message ----- From: "hayes myers" <hayesmyers at gmail.com>
> To: "Brett Dikeman" <brett.dikeman at gmail.com>; <quattro at audifans.com>
> Sent: Friday, December 11, 2009 2:46 PM
>
> Subject: Re: hesitation / bog down
>
>
>  Sounds lke i should have a Mityvac. .. I don't think i hae a bypass valve
>> but could check. (turns out there was a cut-in on MC2 midstream of 91
>> which
>> may make this tricker to figure out.)I did buy a bypass valve (ala Ben
>> Swann) but haven't hooked it up yet...could be that it is time. I was
>> thinking maybe clogged injectors (had run couple of tanks with injector
>> cleaner in the mix)..or perhaps a dying fuel pump.  I'll see if i can't
>> follow the checks you indicate below and see what's what.  So begins the
>> deeper learning of CIS methinks.
>>
>> Thanks Brett!
>> Hayes
>>
>> On Fri, Dec 11, 2009 at 2:36 PM, Brett Dikeman <brett.dikeman at gmail.com
>> >wrote:
>>
>>  On Fri, Dec 11, 2009 at 1:41 PM, hayes myers <hayesmyers at gmail.com>
>>> wrote:
>>>
>>> >  let off and revs fall off like it's going to die.
>>>
>>> Classic signs of bypass valve failure, at least on the 20v's; the dead
>>> giveaway is when the report is of the engine idle dipping or engine
>>> dying coming off a freeway exit ramp.  It's almost always the cause
>>> for that exact symptom.  Don't the late 10v MC2s have bypass valves
>>> too?
>>>
>>> If you've got a mityvac, disconnect the control line from the intake
>>> manifold and apply vacuum.  The problem can be either the control line
>>> cracking, or the valve diaphragm tearing.  It's a $50-ish part, so
>>> definitely test before you replace.
>>>
>>> If the valve is fine (or you don't have one)- maybe check that the
>>> metering plate moves smoothly?
>>>
>>> Oh, also, is the ISV clean and working smoothly?  If it's gummed up,
>>> it can stick in a position where it is almost completely closed.
>>>
>>> Brett
>>>
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>