odd power loss 300 tdi - Defender Source
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Old August 12th, 2010, 09:32 AM
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Todd Miller
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odd power loss 300 tdi

once again I am experiencing some odd issues with my truck. I have recently corrected a timing issue, installed new injectors, installed a new turbo, and adjusted the valves.
Now I have a power loss. The truck will not "pull" and accelerate when the rpm's drop below 2000. I constantly must down shift to bump up the rpm's. The real oddity about this is that when I first drive the truck in the morning it drives "normally" that is, as it used to. It will "pull" and accelerate fine even below 2000 rpm's. But in the afternoon when I head home from work I must drop it into 4th gear on the highway just to maintain 60 to 70 mph. once I get to flat ground and a speed of 65 to 70 then I can go back to 5th, but it is hard to maintain speed. Sometimes I even have the accelerator literally on the floor and I will not pick up speed. any thoughts would be appreciated.
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Old August 12th, 2010, 09:39 AM
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What EGT are you seeing during those times with the pedal on the floor and no increase in speed?
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Old August 12th, 2010, 10:20 AM
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Todd Miller
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I don't have an EGT gauge
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Old August 12th, 2010, 12:26 PM
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did you double check your hoses?

Almost sounds like you've got a constant turbo leak so that you're not getting any pressure into the engine below a certain level
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Old August 12th, 2010, 01:06 PM
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Todd,
You seem pretty good with these @ this point. As Brad was sugesting I would suspect the small tube that goes from the turbo to the injection pump. That said I have no idea why it would run great in the morning and not in the afternoon-its just where I would start. Any idea how many miles are on your injection pump and if its been "tuned" ?
When its acting weak are you blowing huge clouds of black smoke ?
Doug
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Old August 12th, 2010, 02:06 PM
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Doug I assume the IP has well over 100k on it, but I don't know the mileage. It has not been tuned. Oddly I am not blowing smoke. Seems to be running pretty clean in that regard.

Brad- doug you are talking about the turbo boost hose right? I am going to check that stuff today. I have been thinking that perhaps the hose was not connected when the urbo was replaced. However, I can hear the turbo whine as I go throught the gears. But I don't hear it kick in at higher speeds under load. Like going up an incline etc. If I downshift from 5th to 4th and the rpm's go up then I get acceleration but I can't hear the turbo but assume it is working.

the strange thing is that it runs better in the morning when I first start it. I do have a fuel leak at the filler hose and I wonder if that is causing some sort of air in the system that accumulates after I drive it and then let it sit all day? It only leaks when I fill the truck up so I have not really worried about it. but it has gotten a bit worse latley.
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Old August 12th, 2010, 05:58 PM
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Also check there is no blockage in the fuel pick-up in the tank. I had a power loss after about 10 miles running and it turned out to be the filter on the end of the fuel pick-up in the tank. Fixed by siphoning out the bottom of the tank and throwing away the little filter on the fuel pick-up.
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Old August 13th, 2010, 07:31 AM
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Also check the fuel tank venting. If vent is bad you will slowly build a vacuum in the tank and the pump will struggle to fuel the truck. I run vented caps on conversions........or drill a 1/16 " hole through the outer layer of the stock cap.

If you stop driving when symptoms exhibit and remove cap is it hard to remove or seem as if it sucks in a bunch of air?
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