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300D transmission vacuum valve
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CarGuru > Mercedes > 300D transmission vacuum valve 4 May 2005 08:31:29
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300D transmission vacuum valve

Ernie Sparks 30 April 2005 09:31:53
 Anyone know how to check to see if the transmission vacuum valve mounted on
the injector pump is good or not? My wife's 300D shifts rather erratically
and I'm thinking this might be the problem. I put a new modulator valve on
the transmission but that didn't help. Vacuum gets to the valve okay but I'm
not sure how the linkage works from that point.


Add comment
T.G. Lambach 30 April 2005 11:07:01 [ permanent link ]
 The valve allows maximum vacuum at engine idle and reduces that as the
throttle is opened until there's no vacuum at full throttle. The valve
is not repairable. Suggest the vacuum line to the valve be checked for
consistent vacuum.
Add comment
Peter 3 May 2005 03:59:29 [ permanent link ]
 You may have a vacuum leak that is preventing the correct volume of vacuum
from getting to the tranny modulator. To determine this, with the engine
hodd up, stand in front and look at the vac pump. Notice the "H" shaped
vacuum fitting that the vacuum hose goes to and remove the left two hoses,
block the holes in the fitting where they plugged in and experience a huge
improvement in handling, shifting, mileage, etc. Tou can order an "F" shaped
fitting at any MB dealer. it is part #601-078-06-45. P.


"Ernie Sparks" <earnest37@sbcgloba­l.net> wrote in message
news:dLEce.2922$zu.­165@newssvr13.news.p­rodigy.com...> Anyone know how to check to see if the transmission vacuum valve mounted > on> the injector pump is good or not? My wife's 300D shifts rather erratically> and I'm thinking this might be the problem. I put a new modulator valve on> the transmission but that didn't help. Vacuum gets to the valve okay but > I'm> not sure how the linkage works from that point.>


Add comment
Ernie Sparks 4 May 2005 08:31:29 [ permanent link ]
 
"Peter" <pcklein@comcast.ne­t> wrote in message
news:Oe-dna6ue5R9I-­vfRVn-tQ@comcast.com­...> You may have a vacuum leak that is preventing the correct volume of vacuum> from getting to the tranny modulator. To determine this, with the engine> hodd up, stand in front and look at the vac pump. Notice the "H" shaped> vacuum fitting that the vacuum hose goes to and remove the left two hoses,> block the holes in the fitting where they plugged in and experience a huge> improvement in handling, shifting, mileage, etc. Tou can order an "F"
shaped> fitting at any MB dealer. it is part #601-078-06-45. P.>
The entire vacuum system holds good vacuum overnight to operate door locks,
etc. However, as I recall there is a check valve in the system going to the
firewall and that may not have an effect on the remaining system under the
hood. I'll try the ole Mity Vac on it and see if there's any leaking. Thanks
guys.
"Ernie Sparks" <earnest37@sbcgloba­l.net> wrote in message> news:dLEce.2922$zu.­165@newssvr13.news.p­rodigy.com...> > Anyone know how to check to see if the transmission vacuum valve mounted> > on> > the injector pump is good or not? My wife's 300D shifts rather
erratically> > and I'm thinking this might be the problem. I put a new modulator valve
the transmission but that didn't help. Vacuum gets to the valve okay but> > I'm> > not sure how the linkage works from that point.> >


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CarGuru > Mercedes > 300D transmission vacuum valve 4 May 2005 08:31:29
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