Posted a ? about/maybe a blocked oxy/cat on my 617 but I'm thinking it might be the turbo/wastegate.

What i use to feel, 3 weeks ago:1985 300SD 617 ca model, new oil, new trans thats great, perfect shifting and holds and pulls at the 'big hill' past 3000 rpm when the 4/3 down shift happens. Oil pressure guage(dummy) reads 3 and right at 2 at idle.

What I feel now: Loss of power and weird surging/pulsing going up hill. Only problem is going up a steep hill and third kicks in and rpm/power drops and keeps dropping till i reach the top. Third gear is lagging on highway 4 to 3 down shift power too. RPM 3000- 4100 till i let 4th kick in. No other problems at any other speed. Totally different than before.

Now, it could be the waste gate or boost?

thanks for any info you can give me or a general direction.

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Rick & Michele in California
1985 300SD Turbo Deisel
300,000+ miles

1963 Mercury Meteor Stationwagon
1959 Montgomery Ward Silver Pigeon Scooter & matching bicycle
1974 IH Scout 4x4

Start with ALDA.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Sounds like plugged fuel filters to me.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Ya now that I reread it. New filters!

__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Ive blown lots of turbos (not on a Mercedes, but anyways) usually when a turbo is blown you will get quit a bit of white smoke. Ive never seen a turbo just simply seize, they all get excessive shaft play which ruins the seals, and then start blowing smoke.

Filter. I'll check and see. THAT sounds like it could be it. When i need the gas the most, its not there.


Gee....restrictive fuel. Maybe thats why i'm getting 45 mpg!

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Rick & Michele in California
1985 300SD Turbo Deisel
300,000+ miles

1963 Mercury Meteor Stationwagon
1959 Montgomery Ward Silver Pigeon Scooter & matching bicycle
1974 IH Scout 4x4

45MPG ??? did you buy it off E-Bay .

Like 12MPGHWY, said ,"lots of white smoke". I blew a turbo on a dump truck. I was hauling a load of hot asphalt from Redwood City, Ca. up hwy 84, then on to 35 north. the whole way is a really good climb especially a spot on 35 it really climbs. the truck was an automatic with a poor trans cooler, so this thing was always running hot. the truck had about 140000 miles, plus this day was around 100 deg.

I heard this pop sound, check the gauges, all fine. but when I looked in the door mirror,all I could see was white, never seen so much smoke. must hav looked like one of the air planes at the air show.

I pulled over, the eng. died, and I could hear a crackling sound under the hood. opened the hood and and a ball flames shot up out of the turbo. I quickly died down, but the turbo was glowing hot along with the manifold and the down pipe. plus there was a large hole in the exhaust side of the turbo.

So I guess the seal was leaking oil, it got hotter and hotter. Then it was down hill from there.

Turbos last a long time, even with abuse as this truck always got with multiple drivers. and this was the original turbo.
let the engine idle a minute or two to let the turbo cool down and to stableize the heat in the engine. this is if you have been pushing hard on the freeway, climbing a hill etc... most people don`t.

running w/o an air cleaner sucking up debris, birds, etc... will do them in real fast plus a loss of oil.

charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

sounds like you are not getting enough fuel. probably filters, but check everything.
check all the vacuum lines, especially the Banjo bolt and the line going to the ALDA. I had a similar situation and the rubber line going to the ALDA had a small crack in it. doesn't give enough fuel under boost.

I have been experienceing the exact same problem in my 1979 300SD. Not only the mysterious loss of power and switching back and forth between 4/3 on a hill, but also 1-second on/1-second off pulsing and surging of acceleration when going 70 MPH on the freeway.