I've just fitted a 200tdi into my S3, when I start it up, the revs go through the roof and won't settle, there is black smoke billowing out of the exhaust , I have to turn it of because it is revving so hard I worried its going to blow up, does anyone know what's causing this, I'm at my wits end, Daz
Help please
- Thread starter NINJADAZ
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Mr Noisy
Coming in your ears.
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Diesels are fuel regulated only so if its getting fuel it'll run.
If its getting a lot of fuel it'll run fast!
If its burning its own oil it'll run away and then explode
BUT it clearly hasn't run away because you can turn it off so you must check your injector pump is functioning well and not over fueling.
I do not know how this would be done however!
If its getting a lot of fuel it'll run fast!
If its burning its own oil it'll run away and then explode
BUT it clearly hasn't run away because you can turn it off so you must check your injector pump is functioning well and not over fueling.
I do not know how this would be done however!
blackhadder
New Member
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Please be careful. My 300tdi ate its own oil and one of the con rods decided to experiment with moving sideways instead of vertically. Made a fist sized hole in the block.
I've heard that they suck the oil up through the turbo and then blow it into the head via the air intake, the engine then runs till it blows up, mine has no turbo so this shouldn't be the cause, I've got a feeling that the injection pump is stuck wide open. I have no idea how to fix this or even if it's possible to fix it without stripping the pump down and I'm afraid I'm not that mechanically minded...Daz
jamesmartin
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that would sound likely if obvious has been checked ,it would be a injection specialist job or another pump
Turboman
Mab An Gov
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Sounds like it is on the edge of a runaway. Could be the breathers putting crankcase gasses into the inlet tract. rising engine oil levels due to hg or such could be an issue.
If you are nt experienced with this I would do as james says and get someone in the know to look at it.
Last edited:
Mark151151
Active Member
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Have you checked the throttle cable isn't jammed open or the idle stop screw far too far out on the pump.
jamesmartin
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it will fit but wont run right
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