At 2500 - 3000 revs in top gear my golf turbo diesel loses a lot of power, still keeps running, this persists until i stop and restart the engine.the fault clears until the next time i get to the same revs.it has been to a garage where they diagnosed that one of the air flow meters was faulty, but on replacement the fault was still there
Sounds like the car is going into limp mode, and then resuming normal operation the next time you start it. This is probably due to an overboost or under boost situation. If this is the case, the car's computer can't effectively control the boost the turbo is producing, so it just "turns" the boost off. Ask the shop what the engine code was specifically, and then compare it to VW specific codes. ( google "VW OBD codes"). I'm betting the code is either P1556 (boost control negative deviation, underboost), or P1557 (boost control positive deviation, overboost). Proper diagnosis with VW specific software is half the battle. The rest is methodical troubleshooting by you or your shop so you don't replace parts that don't fix the problem. No offense intended, but it sounds like you need to bring your car to a shop that knows VW's. Sorry I'm not more helpful, but without more info, I'm just taking a guess. I've actually had this problem with my Tdi, and the fix was cleaning the intake manifold and a slight turbo actuator adjustment. But, in your case, several things could cause this which is why proper troubleshooting is important. Hope this helps.
Does it do the same in other gears at the same revs?
SOURCE: engine swap
Generally it is not recommended using parts either that the ones designed for same model, however some Passat engine connects same way as Golf. You need to know the Passat engine year and verify engine mounting procedure and connections positions. Getting the two Haynes manuals for the two VW models can help you to compare.
SOURCE: my golf 2001 tdi after 3000 rpm sometimes he cuts the acelerator
Could be a few things. IS the check engine on? Could just be a bad mass air flow sensor. Or a seized wastegate. Yuo can start by trying to unplug the mass air flow sensor. If it runs better it could be just that. Just make sure to remove and clean the lower air filter box change the air filter and the snow screen which is located next to the battery where the air enters. These always are blocked. If it runs ok (not perfect change the mass air flow.
SOURCE: golf gti 16v mk3 miss fire at 2500 3000 revs
VW = ****. Buy new car. Newer American cars are okay. If your going to go to 00' or older stick with japanese make.
SOURCE: vw tdi turbo dying
check the rubber pipes are not collapsing ,they run from the air filter to the turbo if they appear ok then replace the turbo
SOURCE: 1.9 turbo diesel golf , just changed engine, now
EASY TO GET FUEL PIPES ROUND THE WRONG WAY ON FUEL FILTER
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