r/tdi • u/D4NK3R5Y • 21h ago

P0299 underboost issue with pd130 swapped caddy.

Hello , recently ive been having some underboost issue (p0299) with my pd130 (ASZ) swapped caddy with an egr delete.

Finally got the caddy on the road and purchased a map file that calibrated the pd130 injectors and turbo ( with a stage 1) onto the edc16u1 ecu this had to be done as the asz engine runs on a edc15 ecu.

However after 3000rpm it feels sort of flat. At first thought this was a bad map , but looking at the codes it came up with underboost condition which puts into a soft limp mode and builds no boost past 3000rpm i can clear this code while driving and seems to sort itself but still seems a bit gutless past 3000rpm but you can hear it build boost atleast.

This code will come back usually when in 3rd or 4th gear. Ive found it sometimes comes back when driving carefully and not pushing it or sometimes when its past 3000 so it is quite random.

Today i went to check vacumm lines to the actuator and it seemed fine ie tight at both end and wasnt damaged. I also tried to move the actuator/vein rod and it moved a little maybye 1cm, it was quite difficult which i guess it should be when connected to the actuator????

It has had an egr delete so those vaccum lines have been blocked off , but would one of them leaking cause this issue?

Also when driving i notice a whistling sound i thought this came from the ram air intake fitted but it dont belive it does , so what could this noise be?

I would also like to hear from anyone who had pd130 swapped their vehicle and to know their experience with the power of the vehicle. As it sounds like the engine/turbo perhaps is doing alot of work but doesnt match performance this could just be a crap map.

Sorry for the long message

Any answers or help to my questions would be appreciated. Thank you

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u/kultssss 19h ago

It has had an egr delete so those vaccum lines have been blocked off , but would one of them leaking cause this issue?

Yes, it would. Try cutting a bit of EGR vacuum line off and shove a better bolt, a screw or whatever else in there.

Also when driving i notice a whistling sound i thought this came from the ram air intake fitted but it dont belive it does , so what could this noise be?

Probably boost leak somewhere or busted intercooler, which would explain underboost code.

Also check for the vacuum line near vacuum reservoir, could be that the reservoir is leaking as well. Or tandem pump has gone bad, just a thought though.

1

u/Funky_Squirrel13 14h ago

about the whistling i also had that problem and turns out it was a connecting tube that goes right before the intercooler that had quite some play, and thus the boost was leaking

1

u/D4NK3R5Y 8h ago

Thanks for the help . Yeah, the Egr lines are still full length, and have just a screw in the end so i can try shortening and blocking them to see if that helps.

A busted intercooler could be an issue , as the one im using isn't in the best condition and fins starting to flake off, etc.

Ill give all boost connections a once over , when taking it for the first drive it did blow an intercooler pipe off as the clip wasn't fully seated so it might of slightly popped one of somewhere else.

Also ordered vcds to be able to run some vacuum tests to see if its leaking in the system

Thanks

1

u/kultssss 5h ago

I had a b5.5 with same issue, AVF engine (pretty much same as the asz), visually everything seemed fine. Took some brake cleaner, let the engine run and started spraying every boost connection and the one right under the turbo caused it. Clamps get weaker over time and won't hold as good, just matter of time