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  #31  
Old 11-24-2004, 09:39 AM
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Join Date: Sep 2004
Location: Northern Iowa, southern Minnesota
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Holy cow, you guys, what great information. I am going to get this baby into the shop this weekend and figure it all out! Well, at least try...

I have a feeling that the pressure line going to the ALDA is the problem. I bet that has been overlooked by the PO and my indy as well. I'll just do it myself.

Should I use air to blow the thing out? Will blowing air under pressure be a problem for the ALDA? Or will that just push crud into the ALDA?

DS
87 300D
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  #32  
Old 11-24-2004, 10:16 AM
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dlssmith,

Usually its the banjo fitting on the manifold that gets plugged or that end of the line. I wouldn't apply any pressure in the direction of the ALDA. The line can be removed at the electrical overpressure switch and blown out toward the banjo fitting.

P E H
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  #33  
Old 11-24-2004, 11:23 AM
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PEH is right - don't pressurize the ALDA with air from a shop compressor. Blow back towards the manifold. The fitting at the manifold is probably gunked up - just unscrew it and clean it with a small drill bit & solvent. The switchover valve may also be plugged - if so, that can be harder to clean, sometimes they require replacement. You can temporarily bypass it for test purposes.

If you have a MityVac that can build pressure, you can also try pressurizing the ALDA by hand. It should pump up to 15psi and hold that steady, or leak down slowly. If it leaks down fast or you can't pump it over zero PSI by hand, the ALDA shaft seal is worn (about $5 + 1 hour labor to replace).

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  #34  
Old 11-24-2004, 11:28 AM
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This is good. Will do.

DS
87 300D
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  #35  
Old 11-24-2004, 01:14 PM
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Boy I am sure watching this one with interest...

Boy I am sure watching this one with interest...!! I have an 87 300D and GSXR really saved it, I hope he is correct
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  #36  
Old 12-09-2004, 02:13 PM
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Location: HELENA,MT
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so whats the answer

i ask because my 87 is getting 22.8 . great power fast but poor mileage
tia
JOHN M
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  #37  
Old 12-09-2004, 02:43 PM
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22.8 sounds quite low. You sure the odometer isn't intermittent? Changed the fuel filters, air filter, etc...?

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  #38  
Old 12-09-2004, 03:01 PM
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Location: Northern Iowa, southern Minnesota
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Well, here is the answer: I adjusted the ALDA, backed the screw out 1 and 1/2 turns. I think it has never been adjusted before. It is a completely different car!! Much more power and better mileage. I haven't done an exact calculation of the mileage, but the tank doesn't empty nearly as fast, so I know it's better. The big difference is the power and that the transmission shifts more correctly now. It also smokes less.

Thanks to all the input from forum members.

DS
87 300D
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  #39  
Old 12-09-2004, 07:46 PM
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If you ran of WVO then all this milage stuff would be a moot point.
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  #40  
Old 12-09-2004, 08:52 PM
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Location: Geographically challenged on the S.W shores of Lake Michigan in S,E Wisconsin
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fuel mileage comparisons

http://www.fueleconomy.gov/

click on "find and compare cars"

there is a better site that i will try and find that had:
tons of polution per year
avg cost per year at 1.50 gal



okay its the feds but it is a starting point to mileage.
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1983 240d 162+++ Anthricite grey w/ henna red interior and hella lights-wifes car-Red

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and can be seen on the cars for sale thread here. pix also available.


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