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Old 03-14-2003, 08:09 PM
BWatson's Avatar
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Join Date: Jan 2002
Location: Los Angeles
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High Elevation?

I took the benzo up to the mountains yesterday and it was fine until about 5,000 ft. After that it was a gutless wonder. It got me there and back but I was curious if this is normal or if it can be handled with fuel additives? The skiing was great!
1982 300D Turbo "Helga"
380,000 miles
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Old 03-14-2003, 08:57 PM
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Join Date: Jul 1999
Location: malvern, pa usa
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It's a direct result of decreased oxygen due to lower atmospheric at higher altitide. I though the ALDA would compensate to a higher altitude, but I might be wrong. Fuel additives won't help.

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Old 03-14-2003, 10:39 PM
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Location: PA
Posts: 5,440

You didn't say if you had a Turbo MB.

My 300SD Turbo outran everything on the road near Vail CO.

The high altitude causes less air to go into the engine unless the engine is turbo or supercharged. It is the same reason that it is hard to breath at high altitude: there are less molecules of air per cubic unit.

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Old 03-15-2003, 12:17 AM
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Join Date: Feb 2001
Location: Canton,Texas
Posts: 987
He's got a turbo, assuming it's the car he has listed. I wonder if something could be stuck in the ALDA making it less able to compensate for the altitude.
1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k
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Old 03-15-2003, 01:49 AM
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Join Date: Mar 2002
Location: Utah!!
Posts: 4,494
My SD does great at altitude except for off the line. The thing is a real pig until the turbo winds up. I'm wondering if your turbo is sick. They do wear out eventually. The bearings get worn and then the turbo won't wind up as it should, or at all when they get bad enough.
past MB rides:
'68 220D
'68 220D(another one)
'67 230
'84 SD
Current rides:
'06 Lexus RX330
'93 Ford F-250
'96 Corvette
'99 Polaris 700 RMK sled
2011 Polaris Assault
'86 Yamaha TT350(good 'ol thumper)
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Old 03-15-2003, 02:54 AM
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Check your ALDA breather lines. Starting at the ALDA, follow the line to the little unit on the firewall (overboost protector). Disconnect the line and make sure it is clean. Follow the other line from the the little unit on the firewall to the backside of the intake manifold. Loosen the banjo valve attaching the line to the manifold. Remove the line and valve from the manifold. Clean the line and banjo valve. You should be able to blow through the end of the line that attaches to the manifold and have air rush out of the line that attaches to the ALDA. Soot, compounded by the EGR, infests the manifold and clogs these lines. These lines allow the ALDA to recognize Turbo performance and adjust fuel flow accordingly. If the lines are clogged, the Turbo can spool up perfectly but have zero effect on engine performance, because the increased airflow is not matched by increased fuel flow.
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Old 03-15-2003, 01:06 PM
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Location: PA
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Similar happened to me. No power at higher RPMs because IP wasn't injecting enough fuel to match the Turbo boost. But it was a leak in the hose not a blockage. I replaced the hose and problem was fixed.

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