hello, I would like to thank everyone for the help have recieved reading the previous posts. I am 24 and have had 2 benz diesels and I think I will drive them forever. My current car has 145k and is an 86 sdl. I have changed fuel filters, replaced all of the vacuum lines and connectors I can see, installed a new mann air filter, and ran a couple of tanks of power servive cetane booster through it. The car has been running better as it used to sit the longer I drive it. But there is still one problem and I was wondering if you could help. The turbo is boosting but at around 3000-3500 rpm the car has a quick and short loss of boost. This only happens as I am accelerating to about 60mph and no other time. Since the filter changes and new fluids it seems to be getting better, less offensive, but I would like to make irt go away myself. Thanks in advance.

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86 300sdl 145k
85 300sd 270k
86 saab 9000t
85 saab 900t RIP
85 jetta gli 16v RIP

Sounds like the car was sitting for a while.. these cars need to be driven!

Before you try anything else, give it an italian tuneup and see if the problem goes away.. many problems on my '86 300SDL disappeared after a few good runs.

Search the forum for "italian tuneup" if you don't know what I mean.. there are many threads on what it is and how to do one.

Neal

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'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi) SOLD
'07 S550 4MATIC 235,000km (146k mi) SOLD
'07 GL320 CDI 4MATIC 348,000km (215k mi)
'13 GL350 BlueTec 4MATIC 170,000km (105k mi)
'14 SL550 72,000km (43k mi)

Follow the semi-clear vacuum line from the intake manifold to an electric valve. Once there, remove the two vacuum lines from the valve then connect them together.

Test dirve to determine performance improvement, (NO) or (YES)

I have been running the car for an hour a day at 80mph for about 5 months to and from work, she runs strong but the italian tuneup has been fully expressed, MrCjames, what is the electric switch I would be bypassing, the boost protection? If it fixes the problem should I leave the hoses together or purchase a new switch. Thanks I will check it out first thing tomorrow.

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86 300sdl 145k
85 300sd 270k
86 saab 9000t
85 saab 900t RIP
85 jetta gli 16v RIP