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Old 09-23-2009, 01:29 PM
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83 300sd ip??

For all of you who answered by last post about the lack of power with the 300sd and the possiblity of rebuilding the IP thankyou. I have a bit more information that may help with trouble shooting. According to the owner the car does not start to loose power until it gets up to full operating temperature. It runs fine when cold and has full power. The power loss is described as not being able to pull hills and 70 mph, but instead 45 mph. So the car still runs fine on the flats and starts Ok. Any input from anyone? What about a pluged turbo, or failing turbo.(anyway to check). Thanks Kevin

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Old 09-23-2009, 04:14 PM
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Loss of power when the Engine is hot is one of the symptoms of Valve Clearances that are too tight.

If not the I above I would be looking for a problem that can happen over the period of time that it takes for the Engine to warm up. Like, if the Fuel Tank Vent was restricted and it was taking time for the Engine to warm up for the negative pressure in the tank to have an effect.

Try driving without the Fuel Tank Cap on as this would bypass the Tank Vent.

I am inclined to thank that if the Turbo was not working it would also not work when the Engine was cold.

I do not know if your year and model has one but the EGR has a Thermo Vauccum Switch. If the EGR was getting Vacuum all of the time due to the Termo Vacuum Switch a worn out little plastic valves on top of the Valve cover it could be getting vacuum when it is not supposed to. Or, just plain sticking in the open position after the Thermo Vacuum Switch opens and gives it Vacuum when the Engine is hot.

Try disconnectiong and plugging the Vacuum Hose to the EGR so it will not be able to open.
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Last edited by Diesel911; 09-23-2009 at 04:21 PM.
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Old 09-23-2009, 04:23 PM
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I is less likely but Exhaust Back Pressure from a collasped or blocked Resonator or Muffler. Less likely because I think the restriction would still be there if the Engine was cold.

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