Question about 1990 Mercedes-Benz 300 Diesel

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Mercedes Bens OM603.960 Turbo 1990

I have a OM603.960 Turbo, is it possible to get more "turbo boost" from this motor without bying another/bigger "turbo blower"?

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 51 Answers

SOURCE: boost spiking/ over boosting

replace the wastegate vacum lines or wastegate acuator. if they leak it raises the boost. Let me know if its not that.

Posted on Jan 12, 2009

3mac
  • 61 Answers

SOURCE: Transmission Fluid - 1987 Mercedes-Benz Diesel Turbo

It took Mercon Dextron III.

Of course, MD IV, V or Mutli-Vehicle would be better (the new multi-vehicle formula is what is being widely recommended by all nowadays).


Posted on Jan 19, 2009

  • 57 Answers

SOURCE: 90 300zx turbo or non turbo? ??

look for the turbo under the hood it looks like a snail kinda

Posted on Apr 17, 2009

wilsodfarm
  • 986 Answers

SOURCE: Reset turbo boost relay 2003 Cummins

what engine isx ism or what, never heard of a relay, it goes straight to the ecm.

Posted on Jul 31, 2009

alicantecoli
  • 22095 Answers

SOURCE: vw tdi turbo dying

check the rubber pipes are not collapsing ,they run from the air filter to the turbo if they appear ok then replace the turbo

Posted on Sep 09, 2009

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1 Answer

Fault codes P0236 and P0046 keep coming up on my freelander1 td4 2004


P0236 = Possible causes are

1. Boost pressure sensor harness is open or shorted
2. Boost pressure sensor circuit poor electrical connection
3. Faulty boost pressure sensor
4. Faulty Turbo/Super Charger
5. Engine over temperature
6. Ignition misfire exceeds the threshold
7. Faulty Knock sensor (KS)

P0046 = Turbo/Super Charger Boost Control Solenoid Circuit Range/Performance

.... based on this information I would replace the turbo boost control solenoid first.

May 02, 2017 | Land Rover Freelander Cars & Trucks

1 Answer

2004 jetta 1.8 turbo doesnt seem to be kicking in and the engine doesn't have much power. possible causes?


Have the car scanned for fault codes. A power loss in a turbo motor can be caused by simple vacuum leaks. You can check for loose piping and clamps. There are various components in that car that could cause such a problem. These include the turbocharger itself, the turbo boost (N75) valve, wastegate and its linkage, the car's ECU, maybe even a non turbo fault like a clogged catalytic converter or vehicle misfire.

Aug 01, 2014 | 2004 Volkswagen Jetta

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The Turbo Charger does not seem to engage .I was led to believe that after around 30 miles per hr. it would be like haveing a passing gear. Oh yes the car is a 1984 Nercedes SD 300 series Desiel.


The turbo charger has more to do with rpms than road speed.The turbo uses exhaust gas leaving the engine to push more fresh air into the engine thus creating higher compression and more horse power.You should feel some boost above 1500 rpms if everything is working properly.If not then you should have the system checked by a dealer or a good diesel shop.Good Luck!

Apr 02, 2011 | 1984 Mercedes-Benz Mercedes Benz 300 Class

1 Answer

Hi my Nissan 2.5 navada's turbo is kicking in and out and its not the turbo controle unit. It seems to me like a wiring problem where do I start looking


There is no turbo wiring nor "turbo control unit" on a turbo charged engine.. The turbines presure and boost is controlled by mechanical valves that use intake manifold vacume presure.. No user serviceable parts here... Limited knowledge of how a forced induction engine operates is the first sign one can NOT fix this yourself... Fooling with boost componets you have Zero knowledge of is the easiest why to possibly destroy the engine.. Take it to a pro..

Nov 25, 2010 | 1997 Nissan Pickup

2 Answers

I HAVE A 2007 DODGE SPRINTER WITH CODE PO299 WHAT TEST CAN I DO


Check all hoses to and from turbo to intake .. it is most likely a leak somewhere and the pcm is reading it as a underboost code.

Jul 28, 2010 | 2004 Dodge Sprinter

1 Answer

What feeds the boost gauge? On my 87 Supra Turbo, my boost gauge isn't working properly. Is it vacuum operated? Or are it's readings supplied by the MAF or MAP?


The boost gauge is fed by the Turbo. It tells you how much extra air the turbo is putting into your engine. This is turbo ONLY. Usually a little plastic line from the turbo to the gauge.

Mar 05, 2010 | Toyota Supra Cars & Trucks

1 Answer

97 legacy no boost


The second turbo simply follows the first when the system activates it by bringing it in parallel with the first. The first turbo is only designed for a 1200cc motor so it can not deliver enough compressed air at revs for a bigger motor so they arrange to bring in a second turbo of the same size when the first one runs out of puff.
The first turbo is a semi-mechanical device. The ecm raises the boost level at which it operates but it should be producing some boost regardless.
So concentrate on the first turbo.
Isolate it from the ecm control system
(There is a misleading tip on youtube involving pulling hoses but it is misguided, the comment is ignorant, and I do not recommend it)
Instead, as per the manual, on the first turbo remove the system pressure lines from exhaust and wastegate. Loop a short piece of vacuum hose from the primary turbo output to its own wastegate.
Blank off the system hoses you disconnected. Fit a boost gauge, drive it and observe the boost gauge readings (manifold pressure). If the primary turbo is OK this will make it operate at a lower boost level (5-7psi ?) than the system control (10-17psi) but it will be a purely mechanical operation which will isolate where the fault is.
If there is no boost and the pressure stays zero down then the turbo is not working. Check for the wastegate being stuck or maladjusted. If that is working then you bave a faulty turbo for whatever reason. Maybe there is a loose bolt stuck in it from the engine rebuild?

If the turbo is working OK then it points to an electrical issue with the the boost control solenoid which is inside the wing near the vacuum tank beside the battery compartment. The control voltage from the ecm usually pulses it on/off at a fast rate to give a measured control and it may be stuck. Maybe it is the ecm or maybe the valve. But before you go dig it out, first check the pressure lines such as 10 and 23 are connected or not reversed at their connectors where they go through the wing (just behind the battery)
Good luck

Jan 30, 2010 | 1996 Subaru Legacy

1 Answer

Skyline car???


the R32 + 33 skylines are good motor cars, from a 2nd hand point of view, make sure they have been maintained and not excessivly modified, as a nissan mechanic the biggest problem with the skylines are when people increase the turbo boost without bigger intercoolers or fuel systems, this will eventually destroy the motor.
If you can find one, buy an unmodified one, or one that has been modified correctly.
Also be aware the timing belt and platnum spark plugs neede to be replaced every 100,000km or 60,000miles, this can be an expensive job...

May 31, 2009 | 2009 Nissan GT-R

2 Answers

90 300zx turbo or non turbo? ??


look for the turbo under the hood it looks like a snail kinda

Apr 17, 2009 | 1990 Nissan 300ZX

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