300 tdi smokey start & lacking power

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300 tdi smokey start & lacking power

Postby Jaconat » Fri 23 Apr 2010 4:35 pm

My 300tdi Defender is due for it's MOT next week but I am a bit worried about it passing the emissions test.

On start-up from cold I get a large cloud of silver/grey smoke and no power. If I try to rev it too quickly the engine stalls more often than not. I get the smoke and no power for about 500 yards then suddenly it all kicks in and runs fine. If I start from hot, I get a few puffs of grey smoke and no power for 50 yards. I have run a couple of tanks of diesel cleaner through which has made no difference.

Any ideas for a fairly novice mechanic? Where is the best & simplest place to start? The engine is due for it's 6000 mile oil change so want to get this sorted before doing that. Will an oil change help to sort it? Also noticed oil around the top of the rocker cover. Needs a new gasket? Is that not helping?

Thanks for your comments.
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Postby Paul 94 200 TDI dicso » Fri 23 Apr 2010 4:39 pm

Air filter, fuel filter, sedimenter, glow plugs the list goes on, When where they last changed/checked?
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Postby Jaconat » Fri 23 Apr 2010 4:50 pm

Paul 94 200 TDI dicso wrote:Air filter, fuel filter, sedimenter, glow plugs the list goes on, When where they last changed/checked?


Air/fuel filter changed 6k ago. The rest? No idea.... :roll:
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Postby Paul 94 200 TDI dicso » Fri 23 Apr 2010 4:55 pm

Jaconat wrote:
Paul 94 200 TDI dicso wrote:Air filter, fuel filter, sedimenter, glow plugs the list goes on, When where they last changed/checked?


Air/fuel filter changed 6k ago. The rest? No idea.... :roll:


Start there
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Postby Jaconat » Fri 23 Apr 2010 5:36 pm

Not sure if I have a sedimenter? Traced the 2 pipes from the top of the fuel tank, along the chassis rails straight into the engine bay (and on to the fuel pump?) From there into the fuel filter.

Could the fuel filter need changing again? Now on to the glow plugs......
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Postby Paul 94 200 TDI dicso » Fri 23 Apr 2010 5:40 pm

Take the glow plugs out and connect them across a 12 volt car battery, If they are working then they will glow red hot. Take care
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Postby Jaconat » Fri 23 Apr 2010 6:34 pm

Just checked all the glow plugs. No pitting, some carbon on the end but there was oil 1/3 of the way up on three of them (sure that can't be good) particularly the third cylinder from the front (don't know the cylinder number). What does that indicate? Is it expensive? :shock:
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Postby Ralph » Fri 23 Apr 2010 6:42 pm

all 4 cylinder engine are numbered from the front or fan end of the engine.

check the lift pump is operating, if suspect fit a new unit.
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Postby Jaconat » Fri 23 Apr 2010 7:16 pm

Is the lift pump the small unit bolted on to the left of the engine block? Two fuel pipes connected to the top (looks like an alloy disc on to of a unit going into the engine)? How can I test if it is working properly?
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Postby Ralph » Fri 23 Apr 2010 7:51 pm

Jaconat wrote:Is the lift pump the small unit bolted on to the left of the engine block? Two fuel pipes connected to the top (looks like an alloy disc on to of a unit going into the engine)? How can I test if it is working properly?



firstly the left & right on anyvehicle is as seen when stitting in the drivers seat looking forward NOT your left/right when stood in front looking at the engine bay.

fuel lift pump is located on the engines right hand side behind the fuel injection pump & is bolted to the rear of the 2 cover plates on that side. not much you can do to check if it's failed.
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