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Old 06-12-2006, 03:18 PM
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Default mk4 golf gti tdi losing power

My golf (150bhp tdi) is broken

When the car is cold the turbo kicks in when the revs go over 3000rpm, and then blows black smoke out of the exhaust. ....Not good.
But when it's warmed up it has no power (slows down going uphill).
It is very slow and the turbo doesn't kick in at all. Not what I'm used to.

I've changed the air mass meter, but this made no difference.

I took it to a VW specialist who said the turbo is losing boost (I could of told them that!!) and although their computer said the turbo is the problem they actually disagreed with the findings and said "it's probably something stupid, but we don't know what. We will need 4 hours to strip things down and have a better look". (Great... they had the car for two days to tell me this).

Has anyone got any ideas?
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Old 06-13-2006, 05:17 AM
PMI PMI is offline
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Check this:
sticking turbo due to dirty oil; dirty or faulty mass airflow sensor; exhaust gas recircularion solenoid valve sticking open; wastegate valve actuator rod sticking; faulty throttle switches; faulty temperature sensor; loose or leaking brake servo pipe or turbo boost pipe from fuel pump to turbo; faulty ECU; faulty Relay 109.
Good luck!
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Old 06-13-2006, 06:00 AM
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I'd have to agree with all those things. I would bet on the sticky vanes in the turbo or clogged intake mani
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Old 06-13-2006, 07:22 AM
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it looks like to me that the bruther hasn been spooloin the car after long runs. good luk
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