got boost (slight return)?

[Derek Pulvino]

Ingo,

Getting ready to replace the multi-failure sensor again just as soon as the 
new upper-radiator hose comes in.  I guess I can also do an output test for 
the frequency valve, but I'm not sure that will establish whether it's 
working properly.  BPV has been replaced, but probably about 30-50k ago; no 
stalling so...

Perhaps my temp sensor will be the culprit.

Derek P


>Derek,
>
>Duh!  I guess I needed more coffee before I responded.  Lots of vacuum at 
>idle = good.  So, you're only seeing 1.6 for boost, eh?  Freq valve 
>functioning properly?  Check the coolant temp sensor (3 or 4 prong) for 
>corrosion?  BPV for proper operation (bet it's kaput).
>
>Ingo
>
>----- Original Message ----- From: "Derek Pulvino" <dbpulvino at hotmail.com>
>To: <i.rautenberg at waratap.com>; <200q20v at audifans.com>
>Sent: Thursday, December 29, 2005 2:51 PM
>Subject: Re: got boost (slight return)?
>
>
>>Ingo,
>>
>>I'll give a look see...although I think a lower number on the boost gauge 
>>at idle is more vacuum, a situation I wouldn't expect to see with a leak 
>>in the intake path; i.e. when the key is turned on the system measure 
>>atmospheric pressure.  That pressure (atmospheric) is assigned a value of 
>>"1.0"  A lower number then would be more vacuum.
>>
>>Derek P
>>
>>>Derek,
>>>
>>>By what you describe, you have an air leak somewhere -- since you have 
>>>less
>>>vacuum at idle and less boost on boost.  Check all of your vacuum hoses -
>>>paying particular attention to the one from the back of the intake 
>>>manifold
>>>to the bypass valve.
>>>
>>>Ingo
>>>
>>>----- Original Message -----
>>>From: "Derek Pulvino" <dbpulvino at hotmail.com>
>>>To: <200q20v at audifans.com>
>>>Sent: Wednesday, December 28, 2005 1:18 PM
>>>Subject: Re: got boost (slight return)?
>>>
>>>
>>> > Kind of off the top topic, but has anybody seen were the boost seems 
>>>to
>>>be
>>> > across the board lower...in my situation whereas at idle the dash
>>>readout
>>> > used to read 0.3 to 0.4, now it usually reads 0.2, with boost on the
>>>high
>>> > side only going up to 1.6 or so?  I've seen low boost at the top end
>>>before,
>>> > but not with it reading lower at idle too.
>>> >
>>> > Derek P
>>> >
>>> >
>>> > Message: 2
>>> > Date: Tue, 27 Dec 2005 13:19:23 -0500
>>> > From: Phil Rose <pjrose at frontiernet.net>
>>> > Subject: Re: got boost?
>>> > To: "Andrew W. Schlueter" <andyschlueter at 4techwork.com>
>>> > Cc: 200q20V at audifans.com
>>> > Message-ID: <a06100504bfd73576cafe@[192.168.0.100]>
>>> > Content-Type: text/plain; charset="us-ascii" ; format="flowed"
>>> >
>>> > At 12:28 PM -0500 12/27/05, Andrew W. Schlueter wrote:
>>> > >i dont know if it is this cold weather here in ohio, but i am having
>>> > >hesitasion in boost. I am running chipped car with the 2.5 pt. ok 
>>>here
>>>is
>>> > >the issue. 3k rpm, full throttle, nice real fast spool up to 20psi. > 
>>> >not
>>>any
>>> > >more. now it goes to 14psi, hesitates then jumps to 20psi. somtimes
>>>when
>>>i
>>> > >am full throttle in 4th or 5th it will be at 20psi, it will quickyly
>>>drop
>>> > >to
>>> > >14ish psi then right back up in a matter of a few secconds. you can
>>>feel
>>> > >the
>>> > >loss of power. I am thinking of the N75??
>>> >
>>> > Sounds like it could be caused by a pressure "burp" from split hose
>>> > or loose clamp. How is the Michelin Man hose condition?
>>> >
>>> > Phil
>>> > --
>>> >
>>> > Phil Rose
>>> > Rochester, NY
>>> > mailto:pjrose at frontiernet.net
>>> >
>>> >
>>> >
>>> >
>>>
>>>
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>>
>>
>>
>>
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>>
>