I noticed last night that there are some slight hesitations on WOT, 3rd gear from 2000->4000rpm. After 4000 it kind of "kicks in" and pulls strongly and regularly. I trashed it a bit on the way home and there were even 2 times when it did not pull at al until 4000, it was like shuddering all the way.
So, got home, checked for error codes, got none. Looked then at the group 032, readings were: +5.7% and -3.9%. Which means, if I'm reading it correctly, lean at idle and rich under load, indicating a split hose somewhere. Checked a bit under the bonnet and the only obvious thing was the DV (007p) wasn't fastened properly on the bottom, the clip was way too low and there was oily deposit on the TIP. So I took it off, gave it a clean/greasing while at it, and fastened it back properly. Then went for a run and nothing changed unfortunately. I also checked groups 015 and 016 and after waiting a minute or so saw 1 misfire on cyl 2 and 4 each. Waited 3-4 more minutes, no more misfires.
Finally today I managed to make some logs in 3rd, from 2000-ish to 6000ish, WOT. Would appreciate any input on them.
From what I can tell:
- boost builds up too slowly (feels rather like my previous k04 car, which had a pretty serious turbo lag; until this problem appeared I actually liked it a lot that pedal response was very good and lag almost non-existent)
- MAF reading is a little low
Finally, car specs: 25th anniversary golf, 1.8t auq. Mods: revo stage 1, 007p and forge shortshift.
About 1 month ago: looked around from under the car, no obvious oily spots indicating leaks.
About 2 months ago did: injectors check, new plugs (pfr6q).
About 5 months ago: new coilpacks.
Thanks a lot for any ideas
p.s.: I am thinking about buying a boost leak tester (have actually one but gave it to a friend when I sold the previous car and it's now 1500km away), but I don't have a compressor. Anyone know if it's possible to use it with a bike pump?