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Old 02-20-2006, 03:02 AM
Registered User
Join Date: Nov 2005
Location: St Helens, OR
Posts: 41
Is this a vacuum issue or what?

When I step on the gas at 50 or 60 MPH to try and pass or something it 'lurches' like it is trying to downshift but it doesn't. I don't think I have ever felt the car downshift. Also it does this when upshifting from 2-3, and sometimes from 3-4. I almost got hit by a truck the other day and figure it is time to get under the hood and find it.


87 300SDL "Sherman"
89 VW Jetta diesel
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Old 02-20-2006, 03:39 AM
PanzerSD's Avatar
Join Date: Jan 2006
Location: Saskatchewan Canada
Posts: 2,351
That sounds like the same problem that I have sort of.
When I'm driving along, and I gunn it without hitting the kick down switch it revs high and doesn't do anything, and whilst moving off from a stop it flares in every shift. Search "transmission" on this site and you'll be sure to find something that will help you..

What model Benz do you have?
RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)

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Old 02-20-2006, 10:32 AM
Registered User
Join Date: Dec 2005
Location: Texas Hill Country
Posts: 510
I would start by looking over the vacuum system and I would start by re-working ALL the vacuum connectors. Good vacuum to the transmission makes a world of difference on these cars and it is cheap and easy to do.

My transmission was flaring badly and was related to a vacuum leak at the EGR valve...turned out to be 39cent for EGR valve also. There is also a short piece of vacuum hose connector down on the transmission going to the modulator valve and one up top right behind the fuel pump. I found great piece of mind by just replacing ALL the vacuum connections I could get cost was under 20 bucks and BINGO a lot of stuff started working better, like the transmission, door locks, vents, and fuel door lock.

Well worth a shot.
1983 300TD Wagon
Even a broken watch is right twice a day
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Old 02-20-2006, 10:35 AM
Biodiesel300TD's Avatar
Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
Maybe a kick down switch problem. It's under the go pedal. Try disconnecting it and see if it changes anything.

'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
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