Loss of power 300Tdi

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fanie - 30 Oct 2006 06:20 GMT

Hi
I was dirving home with a trailer yesterday and I found that I had
significantly less power than usual. Vehicle is a 96 300Tdi Disco SerI.

After recent posts, I suspected in no particular order:

The lift Pump - I am not convinced mine is working at the last time I
changed the fuel filter, it did not seem to do anything.
The sedimenter thingy at the back near the fuel tank- I have never looked at
it.
The air-inlet elbow collasping - although I thought this would result in
almost total power loss, and I would say I pobably still had about 50-60%.

I had a quick look under the bonnet and saw that the long pipe that runs
from the 90 elbow, past the suspension tower, into the charge cooler seems
to be pretty rough around the suspension tower. I have not yet removed it
but would a crack in this pipe cause the sort of power loss I mention?

I have recently had the engine redone and there was no sign of overheating
or loosing fuilds, so I am pretty sure it is not a head gasket or similar.

Regards
Stepen

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Austin Shackles - 30 Oct 2006 08:24 GMT

>I have recently had the engine redone and there was no sign of overheating
>or loosing fuilds, so I am pretty sure it is not a head gasket or similar.

turbo not producing boost, for one reason or another. if the inlet has
leaks after the turbo, it can do that. Shows you how much the turbo does
normally... I once failed to secure one of the rubber hose bits, and it blew
off, resulting in effectively a non-turbo engine...

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beamendsltd - 30 Oct 2006 09:45 GMT

> Hi
> I was dirving home with a trailer yesterday and I found that I had
[quoted text clipped - 4 lines]
> The lift Pump - I am not convinced mine is working at the last time I
> changed the fuel filter,

Unlikely - 200/300Tdi's don't really "need" the lift pump unless the
injector system requires priming. Most of the time you'd never know
it had failed until you run ouf of fuel - in the middle of nowhere!

> it did not seem to do anything.
> The sedimenter thingy at the back near the fuel tank- I have never looked at
> it.

You ought to - but it's lower down on the list for this problem.

> The air-inlet elbow collasping - although I thought this would result in
> almost total power loss, and I would say I pobably still had about 50-60%.

That's the most likely candidate - and the soft straight one at
the intercooler end.

> I had a quick look under the bonnet and saw that the long pipe that runs
> from the 90 elbow, past the suspension tower, into the charge cooler seems
> to be pretty rough around the suspension tower. I have not yet removed it
> but would a crack in this pipe cause the sort of power loss I mention?

It would, but you'd most likely hear a very noticable whistle.

> I have recently had the engine redone and there was no sign of overheating
> or loosing fuilds, so I am pretty sure it is not a head gasket or similar.
>
> Regards
> Stepen

Richard

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Tom Woods - 30 Oct 2006 10:00 GMT

>Hi
>I was dirving home with a trailer yesterday and I found that I had
[quoted text clipped - 4 lines]
>The lift Pump - I am not convinced mine is working at the last time I
>changed the fuel filter, it did not seem to do anything.

when the lift pump goes on mine (on my third..) it causes a lack of
power. sometimes it also causes the revs to become 'sticky' (they drop
very slowly) and it to race at idle (presumably due to air in the
fuel)

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Austin Shackles - 30 Oct 2006 10:39 GMT

>>Hi
>>I was dirving home with a trailer yesterday and I found that I had
[quoted text clipped - 9 lines]
>very slowly) and it to race at idle (presumably due to air in the
>fuel)

You shouldn't get air-in-fuel unless you have fuel line leaks.

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fanie - 30 Oct 2006 12:04 GMT

Thanks all for the responses. I have managed to track down all the rubber
intercooler bits, but not the main straight pipe as yet. I will take it down
to my chappie later today to see if he can sort anything out. Lift pump
ruled out for now then.

Regards
Stephen

>>>Hi
>>>I was dirving home with a trailer yesterday and I found that I had
[quoted text clipped - 11 lines]
>
> You shouldn't get air-in-fuel unless you have fuel line leaks.

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Dougal - 30 Oct 2006 19:16 GMT

>>>>The lift Pump - I am not convinced mine is working at the last time I
>>>>changed the fuel filter, it did not seem to do anything.

If by this you mean that when working the hand lever it didn't 'pump',
it's very likely that the operating arm (which you can't see) was on
the wrong side of the cam lobe. If it happens again, turn the engine
one full revolution and try again.

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fanie - 31 Oct 2006 06:55 GMT

Thanks for that. My Mechanic mentioned the same little "undocumented
feature" and since everything seems to be otherwise working I will go along
with that.

Regards
Stephen

>>>>>The lift Pump - I am not convinced mine is working at the last time I
>>>>>changed the fuel filter, it did not seem to do anything.
[quoted text clipped - 3 lines]
> wrong side of the cam lobe. If it happens again, turn the engine one full
> revolution and try again.

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