Turbo problem? - Page 2 - PeachParts Mercedes-Benz Forum

bgkast · #16 10-10-2006, 03:25 PM

Where are you measuring boost? I would start looking at fuel. Are you positive your ALDA is getting a boost signal (ie have you "T"ed the boost gauge into the ALDA line)? Have you had your injectors tested?

Gordo · #17 10-10-2006, 05:07 PM

The boose gauge is T ed in at the alda. The alda seems to be working. I took it off and put pressure on it with a bike pump (gently) and the part that regulates the IP moves. However it is maxed out and there is hardly any smoke at all. I have not tested the injectors. I did not think they could be the problem. They are a little leaky. Could the slowness be caused by faulty injectors? I have Injectors I could put in from a non-turbo 617 are they the same? The part # is diferent, but they look the same.

rrgrassi · #18 10-10-2006, 05:17 PM

No blowby is a wonderful thing! Mine has blowby, but by the "tea kettle" test, oil fill cap jumps around, but does not try to jump off.

Did the PO tell you why the engine was replaced? Do you know if the current turbo came with the engine, or did the PO mount the original turbo to it?

Leaky injectors can cause sluggish performance as well. Fuel leaking out can also mean air being sucked in resulting in less fuel for the combustion.

The non turbo injectors are not compatible. Their pressure requirements for operation are different.

Johnhef · #19 10-10-2006, 05:29 PM

2 more suggestions-

1) if your alda is maxxed out, get another one from a parts yard thats unmolested from the lowest mileage one you can find and try that- i'm about to do that on mine. my first replacement alda (maxxed out) is nowhere near the output my original one (that was 1 1/2 turns before full) was before it broke.

2) tank strainer.

also do a 0-60 run and give us a time to go off of. ....and your ca motor will have lower boost then all our fed's.

rrgrassi · #20 10-10-2006, 05:33 PM

My ALDA still has it's cap, and appears to be working fine.

Gordo · #21 10-10-2006, 05:34 PM

I put the motor in. The car is actually a 1980 300td. It had a blown head gasket and a trany that slipped a lot in 2nd gear. The car was $250.00 so what the heck. I found this 1985 300td turbo motor at the salvage yard. I dont like auto tranys anyway, so I swtched it for a 4 speed from a 1976 240d. Everything works fine, I just hoped for a little more out of this motor. Hence all the qustions.

Gordo · #22 10-10-2006, 05:38 PM

0-60 I is around 17 sec. I have not changed the tank strainer, but I did switch the fuel lines under the hood to run the fuel through the system backward. No change. EGR is disabled with a 1/8in metal plate. Turbo valve for the EGR system is also disabled... Ruber washer holding it closed.

OMEGAMAN · #23 10-10-2006, 05:40 PM

You could try what Forced Induction did and drive with the alda removed. That will let you know if it has a problem.
If thats a california engine does it still have the trap oxidizer on it? Restriction in the exhaust can kill power and mileage on any engine but on a turbo engine it will slow down the turbo.

Gordo · #24 10-10-2006, 05:45 PM

I took the alda off and it smoked a little when it realy mashed the pedal. No faster though. Is the trap ox. on the motor or is it on the car and connected to the motor? I dont think I have one I will need to look. I have done the Italian tune up. No change.

rrgrassi · #25 10-10-2006, 05:51 PM

I do not think it's the tank strainer since there was no change during the supply/return hose position swap...

Good job on the find! For $250 you can't go wrong!

Omegaman has a good point on the trap ox. There are threads on how to remove and bypass it, especially since your car in a non-cali car. Not a bad idea to see how she runs with out the ALDA.

If all this checks out, which I think it will since you have done your homework,
I do have a question about the wrecking yard motor.

Did you get to pick it out, or did they already have it pulled and waiting for you to pick up? If they pulled it, there is no guarantee that the turbo remained protected from moisture, if the hood was open, or if the air cleaner cover was either missing, or the aircleaner bolt was missing, water has a way to enter, causing rusting of the impeller shaft and bearings on the turbo. That will result in the drag vs. free spinning characteristics.

Also, did you bypass the EGR? Stuck open EGR will also give sluggish performance.

Since the engine is out of an '85, see if you can "federalize" it, and get rid of the Cali emissions crap.

OMEGAMAN · #26 10-10-2006, 05:59 PM

One more thing. Last year my turbo started to slow down. I didnt notice it driving but when I had the U tube off it did'nt spin so well. I took off the oil supply line to the top of the turbo and sprayed some carb cleaner in there while spinning. It freed right up and still seems to work fine. The turbo shaft spins on bronze bushings not ball bearings so remeber that when you check how free it spins.
I can still make it up Floyd hill at 75mph!

Gordo · #27 10-10-2006, 06:08 PM

Quote:

Originally Posted by rrgrassi

I do not think it's the tank strainer since there was no change during the supply/return hose position swap...

Good job on the find! For $250 you can't go wrong!

Omegaman has a good point on the trap ox. There are threads on how to remove and bypass it, especially since your car in a non-cali car. Not a bad idea to see how she runs with out the ALDA.

If all this checks out, which I think it will since you have done your homework,
I do have a question about the wrecking yard motor.

Did you get to pick it out, or did they already have it pulled and waiting for you to pick up? If they pulled it, there is no guarantee that the turbo remained protected from moisture, if the hood was open, or if the air cleaner cover was either missing, or the aircleaner bolt was missing, water has a way to enter, causing rusting of the impeller shaft and bearings on the turbo. That will result in the drag vs. free spinning characteristics.

Also, did you bypass the EGR? Stuck open EGR will also give sluggish performance.

Since the engine is out of an '85, see if you can "federalize" it, and get rid of the Cali emissions crap.

I got the motor from Don's Sports Car Salvage in Pueblo. It was in a wrecked car and I was able to run it before I bought it. The hood was closed and everyhting looked good... Air cleaner etc. However I did not pull the motor my self they did that.

The EGR is permanently closed.

Gordo · #28 10-10-2006, 06:09 PM

Quote:

Originally Posted by OMEGAMAN

One more thing. Last year my turbo started to slow down. I didnt notice it driving but when I had the U tube off it did'nt spin so well. I took off the oil supply line to the top of the turbo and sprayed some carb cleaner in there while spinning. It freed right up and still seems to work fine. The turbo shaft spins on bronze bushings not ball bearings so remeber that when you check how free it spins.
I can still make it up Floyd hill at 75mph!

Floyd hill 55mph tops.

Gordo · #29 10-10-2006, 06:22 PM

Thanks for the tip on cleaning the turbo out with carb cleaner I will have to try that. If that doesn't help I will check my injectors.

whunter · #30 10-10-2006, 06:31 PM

Quote:

Originally Posted by Gordo

It is a CA motor. The fins on the intake side look OK (have not looked at the exhaust side yet), and the turbine has no play but might be a little stiff to turn. It spins easily by hand but it stops right away when I let go of it. As far as I can tell it sounds normal when it spins up under load. New fuel filters.

This sound like bad turbo bearings.........

Data on Turbocharger and Waste-gate Adjustment are in
Engine Mechanical:
Engine Mechanical:

Trap Oxidizer data is in
Exhaust:
Exhaust:

Have a great day.