Doesn't he mean, under the filter box and on top of and by right front inner
fender - in engine compartment?
Wilton
----- Original Message -----
From: "Larry T" <l02tur...@comcast.net>
To: <mercedes@okiebenz.com>
Sent: Friday, July 05, 2013 8:12 PM
Subject: Re: [MBZ] NOW TURBOCHARGER --*** WAS Transmission W124 91 300D
I may take it to the stealer - sounds like it may be beyond me - I could
maybe do it but need pictures of what I'm looking for but cannot find
anything in the WSM so far. I'm trying the parts websites in hopes of
finding one there so I will know what I'm looking for.
You said "under the fender. " I don't recall anything under there but
will look as you suggest...
Thanks again for your help :-)
LarryT
On 7/5/2013 6:15 PM, Peter Frederick wrote:
The switchover valves are behind the air filter box, under the fender.
On that model, there are three, one for the boost controller, one for the
EGR, and one for the tuning flap in the intake, I believe. If any have
failed, you are in "limp mode" -- no boost, no extra fuel, basically a NA
engine with a dead turbo stuck in the intake. They must hold vacuum when
energized, so must the various things they are attached to.
They are electrical switches that operate vacuum valves, so you must
verify that the vacuum holds and that they switch as they should.
You also need to check the over-boost protection switchover valve on the
firewall on the driver's side. There is a line that goes from the intake
manifold (next to the overboost switch) to the over-boost protection
valve and from there to the ALDA and the vacuum amplifier for the
transission. All that tubing must be clear, not filled with oil, and
hold pressure. It's not unheard of for the over-boost switch to blow out
and leak all the boost signal off. You can test it by attaching a clean
line to the valve in place of the one from the manifold and blowing into
it. If air blows out the top of the valve, it's shot (engine off, of
course) and if the pressure leaks out somewhere else, fix that too.
Don't replace the dampers in the lines with plain tubing, it can cause
surging due to erratic pressure to the ALDA.
Peter
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To Unsubscribe or change delivery options go to:
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_______________________________________
http://www.okiebenz.com
For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
