Barna Posted December 8, 2010 Share Posted December 8, 2010 Hi First of all, sorry about my poor English. I have problem with my 1996 300tdi Disco (manual, no EGR, not EDC). Without any notice lost the power. Currently the engine is like the simple diesel. Symptom: Max speed is 90km\h No smoke with full throttle. Boost pressure building up very slowly No any wrong noise from the engine Start without problem. The engine is 300tdi 240k Km. No EGR, NO EDC This is the list what we checked and tested: Tank full with diesel Sedimentor clean Flushed the fuel line No air in fuel Fuel filter new (tried with two different brand) Air filter new No blockage in air pipes and intercooler No blockage in fuel line Turbo ok Boost line is not leaking Fuel pump boost sensor membrane seems to be good. Not feel any lake Fuel lift pump working fine. Pressure is 1.2Bar Tried to run the engine with external test fuel tank: No difference Tried different diesel Injectors age are approx 40k. No smoke! Measured the turbo boost pressure: the max is 0.95 bar at 3000-3200 RPM, but building up very slowly. (In the past I felt the turbo boost around 1800 rpm) No any special noise from the engine, Idle is good, running like before except power. It seems that no enough fuel for the engine. The strange thing that was no notice before power lost. On weekend it was ok, next time on Monday after start, felt the problem. I have no idea what can be else Would you be so kind to help me, where can be the problem? Barna Quote Link to comment Share on other sites More sharing options...
Range Rover Blues Posted December 8, 2010 Share Posted December 8, 2010 The boost building up very slowly sounds like an issue, does the power come back as the pressure builds up? what pressure do you get now? I'd check that the turbo waste gate is working propely and not stuck or opening too early. Quote Link to comment Share on other sites More sharing options...
Barna Posted December 9, 2010 Author Share Posted December 9, 2010 The boost pressure builds up but on high rev. and slowly (0.95 Bar). Most of the power not comes back. Not checked the waste gate jet, but I think if the waste gate has leakage, boost can’t build up. Today, we will remove the fuel injection pump and send to specialist. (He mentioned that in the high pressure head locates one small filter that can blocks the fuel too) Quote Link to comment Share on other sites More sharing options...
fozsug Posted December 9, 2010 Share Posted December 9, 2010 Sounds like injection pump, but check the turbo actuator isnt seized Quote Link to comment Share on other sites More sharing options...
BogMonster Posted December 9, 2010 Share Posted December 9, 2010 The diaphragm and/or the pin which travels up and down the shaft on it can seize in the pumps, so will also have the same effect as an air leak in the pipe back to the turbo - no fuel enrichment. Quote Link to comment Share on other sites More sharing options...
Barna Posted December 9, 2010 Author Share Posted December 9, 2010 The diaphragm and/or the pin which travels up and down the shaft on it can seize in the pumps, so will also have the same effect as an air leak in the pipe back to the turbo - no fuel enrichment. Hi BogMonster Problem solved Thanks your help. The diaphragm shaft stacked. After a clean and lubrication, engine had back the power. It seems now little bit better than before. Strage that no any internal lubrication for the pin and shaft. Thanks again. Barna Quote Link to comment Share on other sites More sharing options...
Barna Posted February 4, 2011 Author Share Posted February 4, 2011 Update: Power lost again. Diaphragm shaft lubrication not solved the problem. Removed the injection pump, and sent to specialist. The problem was that the turbo boost sensor pin and mechanism corroded inside the pump body. Everything else was ok. Specialist had never seen that. Rebuild the pump, and now I have a “new car”. Power and torque are much better then ever before. Boost comes around 1500rpm. It was cheap tuning (approx 90 Pound was the rebuild cost here in Hungary) Quote Link to comment Share on other sites More sharing options...
BogMonster Posted February 5, 2011 Share Posted February 5, 2011 I've not seen one but I've heard of one example locally - quite a few years ago on a 200Tdi pump. Picked to bits by somebody brave and unstuck and it worked fine after that Quote Link to comment Share on other sites More sharing options...
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