Re: [MBZ] Larry's 300D 2.5

[Larry Turner via Mercedes]

HI Curly,
Sorry to hear you are having more problems with "my" 300D.  I don't 
recall any turbo problems, but it sat for about a year while I figured 
out what to do with it.  The only way I ever checked to confirm things 
were as they should be was to warm it up then do a 0-60 test looking for 
around 6+ Seconds.  (I may be wrong on the # of seconds as it's been a 
while since I did that test.)


I was going to adjust the ALDA at one point but the professor said the 
91 ALDA did not benefit from adjusting.  Can't recall the specifics.


So the rear wheels aligned without trouble?  I know you put a lot of 
work into the rear suspension!


Stay safe!
Larry

On 3/6/2020 10:04 AM, Curley McLain via Mercedes wrote:
Checked over the vacuum system.   did not find any problems.   Blew 
out the manifold fitting and line to overboost cutout.   It is a 
little better, but not where it should be.   I don't have a vacuum 
gauge here to check actual vacuum. When driving you can tell is is 
getting some boost, but not where it should be.


What should be next?   Turn up the alda?

The 87 300D will chirp the tires going from 1st to 2nd.   THis one is 
nowhere near that.   With a missing cyl, it may never chirp the tires, 
but all y'all have talked about how these are better than the 87.   So 
far, I like the 87/OM603 better.



Kaleb Striplin via Mercedes 
March 4, 2020 at 7:29 AM
You probably have a vacuum leak somewhere. The turbo is vacuum 
operated on these rather than pressure. Low vacuum equals no boost.


Sent from my iPhone




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Re: [MBZ] Larry's 300D 2.5

[Curley McLain via Mercedes]

Checked over the vacuum system.   did not find any problems.   Blew out 
the manifold fitting and line to overboost cutout.   It is a little 
better, but not where it should be.   I don't have a vacuum gauge here 
to check actual vacuum. When driving you can tell is is getting some 
boost, but not where it should be.


What should be next?   Turn up the alda?

The 87 300D will chirp the tires going from 1st to 2nd.   THis one is 
nowhere near that.   With a missing cyl, it may never chirp the tires, 
but all y'all have talked about how these are better than the 87.   So 
far, I like the 87/OM603 better.



Kaleb Striplin via Mercedes 
March 4, 2020 at 7:29 AM
You probably have a vacuum leak somewhere. The turbo is vacuum 
operated on these rather than pressure. Low vacuum equals no boost.


Sent from my iPhone




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Re: [MBZ] Larry's 300D 2.5

[Kaleb Striplin via Mercedes]

You probably have a vacuum leak somewhere. The turbo is vacuum operated on 
these rather than pressure. Low vacuum equals no boost. 

Sent from my iPhone

> On Mar 3, 2020, at 11:23 PM, Curley McLain via Mercedes 
>  wrote:
> 
> Got it aligned today.   Will pick it up in the morning, and it goes 
> immediately into service.   Running out to the alignment place, it did not 
> appear that the turbo was working, or at least it was lazy.  I will blow out 
> the line to the intake manifold.
> 
> What other things should I check?   OVP relay?
> 
> It is a 91, and think I heard that you can't block off the EGR on these 
> without causing a digital fit with some black box.  I forgot if there is a 
> way to check EGR because I always blocked it (easy) or took it off (Best)  It 
> has a nest of vacuum pods on top of the EGR, and I have not investigated any 
> of these yet.
> 
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Re: [MBZ] Larry's 300D 2.5

[Peter Frederick via Mercedes]

Check the switch-over valves, they tend to fail and cause error conditions that 
lead to no boost.

Ditto for perished vacuum lines to the servos.
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Re: [MBZ] Larry's 300D 2.5

[Rick Knoble via Mercedes]

Curley asks:

>What other things should I check?   OVP relay?

If the black box (EDS) has an analog/digital fit, you have no boost. I recall 
mentioning this on Dimitri's alternator thread. Two solutions, fix the EDS 
(troubleshooting required) or GXRS aka Spudboy aka Dave Meiman's wastegate fix. 
It requires parts to turn it into a mechanical system. I've seen the thread on 
Peach Parts or one of the other forums. If I get a chance tonight, I'll find 
the thread and post a link. 

Rick
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[MBZ] Larry's 300D 2.5

[Curley McLain via Mercedes]

Got it aligned today.   Will pick it up in the morning, and it goes 
immediately into service.   Running out to the alignment place, it did 
not appear that the turbo was working, or at least it was lazy.  I will 
blow out the line to the intake manifold.


What other things should I check?   OVP relay?

It is a 91, and think I heard that you can't block off the EGR on these 
without causing a digital fit with some black box.  I forgot if there is 
a way to check EGR because I always blocked it (easy) or took it off 
(Best)  It has a nest of vacuum pods on top of the EGR, and I have not 
investigated any of these yet.


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