Loosing engine power in a 92 W124

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cllan@handi.dk - 25 Oct 2006 12:34 GMT

Having a W124 (300 Turbo Diesel) from 92. After a rutine service check.
Oil change, Air filter asf the car seemend nearly numb on the speeder.
The usual roar of power in the har been replaced by a feeling that the
engine doesn't get enough full or the wrong mixture.
The garage (certified Mercedes) has tested afterwards but can not tell
what should be wrong. Niether do they acknowlegde to experience a power
loss. As they say: "It's and old car.. relax!"

Since it has only gone 280.000 km. I do think I am entitled to
experience the Diesel power for a little longer!

Any idears to the cause of this?

Best regards
Chris

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macdrone - 25 Oct 2006 19:52 GMT

> Having a W124 (300 Turbo Diesel) from 92. After a rutine service check.
> Oil change, Air filter asf the car seemend nearly numb on the speeder.
[quoted text clipped - 11 lines]
> Best regards
> Chris

Sounds like a vacuum line issue or engine wiring harness issue. If
they did a full tune they may have messed up something in there. The
Mas sensor and and such could cause it also.

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T.G. Lambach - 25 Oct 2006 20:03 GMT

This answer may apply to your car's motor.

Older M-B diesels sense the turbocharger's boost pressure and add some
extra fuel so the car accelerates more quickly. This is done by a thin
plastic tube that's connected to the motor's intake manifold; its other
end is connected to a device on the motor's injection pump. The tube's
intake end sometimes gets plugged with dirt and acceleration suffers.

Suggest you look at the rear end of the motor's intake manifold to
locate this tube and follow it to the injection pump. The tube may be
disconnected somewhere or broken.

Remember, this suggestion is based on older engines, your motor may be
different and therefore my suggestion will not apply.

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