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  #1  
Old 10-25-2002, 11:23 AM
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Join Date: Mar 2001
Location: Schenectady, new york
Posts: 229
tubo boost gone?

Changed my oil and lost my turbo boost on my '86 300SDL, unrelated events i think? What's the first think i look for with lack of turbo power?


86 300SDL 173,000
87 560SEL 133,000
87 560SL 128,000
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jcciem
'94 SL5000 60,000
'91 350SDL 545,000
'91 350SD 197,000
'00 E55 AMG 77,000
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  #2  
Old 10-25-2002, 11:37 AM
Registered Diesel Burner
 
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
My recomendation is to check and clear the boost sensing hose that connects from the side of the intake manifold to a device on the fender.

I had the same thing happen to me after a repair session. This hose is relatively small in diameter, especially the hard plastic section, and is exposed to all the soot thrown into the intake manifold by the EGR valve. If your car is like mine, it ran for many years before the EGR valve managed to malfunction and stop blowing soot into the engine intake.

So, disconnect both ends of this hose and blow through it to clear it. Reconnect the fender side and again blow through it to try clearing anything lodged in the switch device.

Also, run a small wire through the hose fitting on the intake manifold to clear it.

Sure makes a difference in performance when the boost doesn't work. I left my boost disabled for awhile to see what the difference would be in fuel mileage. For me it might have been 1/2 mile per gallon over the course of a tank. Not worth it to go without boost. I guess the turbo gets you up to cruising speed faster.

Ken 300D
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  #3  
Old 10-25-2002, 10:45 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
It's more likely you pulled the boost control line off the overboost control switchover valve on the firewall, it isn't very far from the oil filter.

Check to make sure the white plastic hose from the intake manifold (just about dead center) is connected on both ends, and that everything it connects to has all the bits attached, too -- it goes to the ALDA, the switchover valve, and the blue vacuum amplifier on the fender.

Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #4  
Old 10-29-2002, 03:52 PM
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Join Date: Mar 2001
Location: Schenectady, new york
Posts: 229
lost turbo boost

It was the boost controle, I cracked it while changing the oil, thanks for the assistance
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jcciem
'94 SL5000 60,000
'91 350SDL 545,000
'91 350SD 197,000
'00 E55 AMG 77,000
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  #5  
Old 10-29-2002, 08:41 PM
Registered User
 
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
You're welcome!

Fairly hard to actually damage the turbo while changing the oil....!

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote
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