I have an 84 300tdt that recently developed a noise coming from engine exhaust or turbo that changes depending on engine speed and in the car it sounds like a Nissan 300z. Anyone know what that could be? Thank you

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'84 MB 300TDT 280,000. My first MB (Owned since 190,000)
'83 MB 300D w/ 165,000


John3:30 "He must become greater, I must become less"

Maybe you ran over a ricer and it's still stuck under the car.

Maybe an exhaust leak? Can you track it down with the car standing still?

Unfortunately I don't have a Nissan Z car handy for comparison purposes. You'll need to describe the noise in more detail

Whistling sound? Sound like a 'fartcan' exhaust tip on a Honda? Burbling sound? Rumbling sound? High-pitched sound?

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

If its a whistling sound check the tube between the air cleaner and turbo to make sure it is not cracked and is still installed properly/tight, otherwise you are sucking in unfiltered air. On the other side of things, inspect the whole exhaust pipe, especially near the turbo and down/flex pipe.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Weird, my car just started doing this. I have a leak either at the manifold or the downpipe. I was able to trace it by starting the car cold then pulling on the throttle linkage a bit while it was still running rough so it would smoke. Sure enough, I got smoke coming from near the firewall on the pax side. It's either at the manifold or the downpipe (probably where the flex pipe is). It isn't hard to troubleshoot. Good luck.

BTW, if it's the manifold gasket leaking, the repair sucks. It's terrible. Not looking forward to it.

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1984 300D 193.5k miles
ASTM-certified B100 bio when able

Sound like a Nissan 300Z, that's funny. But what is more funny is the trend around here. Seems stuffing whistles into the exhaust of yo big bad*ss diesel truck and overfueling them is all the rage... TWEEEEE!!! Hisss TWEEEEEEEEeeee!!! Hisssssssss and black smoke billowing with every short jab on the pedal. These trucks usually sit about 4 feet off the ground and are over decorated with "mean" looking trinkets and emblems. I notice on magazine racks all the material feeding this crowd.

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Cheers!
Scott McPhee

1987 300D

Honestly, pulling the turbo and manifolds on a 617 isn't that bad. You'll be surprised how easy the nuts and bolts come off after 25+ years. The only ones that are a PITA are the turbo supports under the manifold and against the block. They're easier to access with the car on a lift by coming in underneath but not all of us have that ability.

These cars cost $30k new because Mercedes used quality fasteners made from quality material.

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Never a dull moment at Berry Hill Farm.

Think about how easy they'll come off after only 6 months, which is about how long it's been since I replaced the manifold gasket!

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1984 300D 193.5k miles
ASTM-certified B100 bio when able

Wow. Well something more to look forward to I guess. On the central-east end of Canada we're usually a year or two behind in the custom trends. Our diesel pickup crowd are still in the "I can jack it higher than yours" phase....

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

Nice - that brings back memories - it came just after the oversized wheels and jacked up back end phase that went out of fashion quite quickly over here after the introduction of roundabouts!

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Where in the states do you live?

Every bolt that can possibly be rusted on my car is. For me any work on the exhaust system is a bear because of the rust attacking the bolts.

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-Typos courtesy of my mobile phone.

This noise may be something loose and resonating inside the exhaust system as well. Almost impossible to guess when not actually hearing it.

I think some '84 turbo models had the ARV (air recirculation valve) - maybe late 84's had these. I remember these caused the whistling sound. Surely, '85 turbo models had these.

The ARV is on the turbo, and probably has a vacuum line going to it.

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