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Discussion Starter #1
Hello, VW brothers ;)

Here I have a problem, that has not yet been described anywhere else on the net, so it might be a bit of a challenge to you, guys!

My LT35, 2.8 TDI, 54-REG loses it`s (otherwise ENORMOUS) power withing some specific engine revs ranges.
When I drive it and accelerate, it takes off great, but when it reaches approx. half of the revs scale it suddenly loses power for a couple of seconds and then re-gains the acceleration just to lose it again right BEFORE reaching the top speed.
It feels, like one of the cylinders is not getting fuel, or there`s too much air, or, or, or...

Can you help???
 

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Discussion Starter #2
OK - only wanted to add a few details:
- problem is definitely related to the turbo charger
- checked the actuator, n75 vac valve - OK
- checked the rubber pressure hoses - OK (good suction at every end)
- checked the turbine - seams OK
- checked in motorway conditions - still losing power, especially at 3rd gear up to 5. 1st and 2nd gear seams the engine has enough pull to force the turbine to work.

Conclusion - no idea what can be wrong...
Air flow sensor?
Anybody here has any idea, perhaps...?

Thanks!

Andy
 

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Every time Ive had the problem as you described, it was the fuel pump or fuel distro, but I've never had a TDI.
 

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Discussion Starter #4
Changed N75 valve, mass airflow sensor AND apparently cracked intercooler - problem solved.
Thanks for all help.
 
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