My 92 300d has a lack of responsiveness when you give it throttle. The turbo works great, i replaced all the vacuum lines and the turbo spools at like 1600-2k. But i drive it with my foot in it all the way before kickdown. If you floor it, there's a general lack of responsiveness. The car won't move, it will just keep going at the same pace. At wot from a deadstop, it does have power but not otherwise.

The fuel filters ok and the vacuum system is functioning. It also has a good vacuum pump.

I was thinking of checking the alda and taking it off for a test drive but looks like you have to take the manifold off. Not what I'm trying to do at the moment till i have a gasket and glow plugs to replace the broken ones.

Also, how hard is it to check the intank filter? Can that cause a lack of responsiveness in throttle? It just seems like the engine doesn't want to raise in rpm when you give it gas

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

Check your ALDA. If it is good, it should be able to hold vacuum. If it doesn't, you probably need a reseal. My SDL was behaving this way before I tuned the IP and resealed the ALDA. Post-tuneup the difference is incredible. I wound up making the IP leaner, but with the now-functional ALDA the power pickup is very smooth and the power delivery is more or less "effortless" when driving around in town.

Prior to the tuning and ALDA fixing, it was DOG until the turbo spooled up, then had decent power. The problem came in city traffic where it was in a high gear and the turbo just wasn't spooling. GUTLESS.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Also check the 27mm over-pressure switch on the in-take manifold, just in front of the cruise control actuator in this picture here: http://www.peachparts.com/shopforum/groups/w124-300d-2-5-turbo-picture2068-dsc00027.html

Too much pressure grounds the lead, which then opens the vacuum tube switch to the alda.
If the pressure switch is stuck, i.e. constantly grounding, then your alda will not boost your fuel during turbo time and, ergo, no turbo benefit. Disconnect the lead and check for ground continuity on the switch connector (with the engine off). You should not have any. The switch can get gummed up inside with egr goop. Try cleaning before replacing. Also check that the lead between the over-pressure switch and the vacuum tube switch is not shorting to ground itself.

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http://i284.photobucket.com/albums/l...aman/Fleet.jpg

Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

You shouldn't have to take the manifold out to get to the ALDA. It's tight but you can do it.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Are you talking about the overboost protection circuit? The '92 doesn't have that. If you're talking about something else, well, I didn't recognize the thing in your pic, so maybe the '92 doesn't have that either, lol.

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Yeah I'm confused too. Could you elaborate a little more ]wogaman? Mine doesnt have the blue saucer setup. Ill check the alda too.. can the tank filter cause a low power issue

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

If you're getting enough diesel to have good power off the line with WOT, then no, the strainer in the tank probably isn't the issue. If it was, you'd be choking then too.

If you have the vacuum operated wastegate you likely don't have the overboost protection circuit. The earlier cars with the mechanical wastegate had a sensor in the intake plenum and a switchover valve on the firewall which killed the ALDA signal to prevent the turbo from spooling if the wastegate stuck closed.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

GPS

'Got I.M. for '90 AND '92 and whatever's in the picture is on Neither (?)

But,I'll delve into it...

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'84 300SD sold
124.128

Have you tried disconnecting the MAF? That restored all the power to mine when I was having over boost protection kick in from the ECU. The ECU looks at changes in MAF when exhaust gases are recirculated into the intake and limits boost. Unplugging the MAF seems to bypass that part of the ECU's logic.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

nah i didn't thanks i'll check that too.

thanks for all the suggestions will update as time proceeds for me to look at the car

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

I just went through all this stuff on semi-project car. Started and ran great, zero power, no boost.

Cleaned intake manifold + new gaskets
Fuel filters
Wastegate upgrade
Connected manifold pressure straight to the alda
EGR and flapper delete
2.5 inch straight pipe

14 peak PSI, spins the tires off the line.

The one thing the really helped was the bypassing of all the stuff controlling the ALDA. It came alive. I'm still going to adjust it and get some more off the line responsiveness, but for now, it's actually fun to drive.

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1990 2.5T 300D: 3 inch exhaust, GSXR mod, custom intake, egr and alda delete

I since sold this car, but I will take that advice into consideration. I plan to do that, I just picked up a 93 300d that won't do over 50mph off a member off here. Once I get it home and work on it I will investigate.

I'm surprised your car spins tires. Mine wouldn't even do a burnout power braking it

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

On loose gravel my SDL will spin the tires off the line. Otherwise you can forget about it. That said, I'm pretty sure a Yaris will spin the tires off the line on loose gravel too. With good tires on one of these cars, I don't buy a burnout on takeoff.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

I'm thinking the same thing

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"

I'll take a video when I leave work this evening. I have a pair of crappy tires (lots of tread) that offer zero traction under any circumstance.

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1990 2.5T 300D: 3 inch exhaust, GSXR mod, custom intake, egr and alda delete