Boost Drop at redline

[murat]

did a boost leak test, the dv was leaking, cured the problem.

i also wanted to clean n75(wgfv) when examining the hoses of n75, i found the old owner(********) blocked the hose between wastegate and n75, during on road testing, now car boosts around 0.5-0.7 bar depending on the gear. only onece at 5th gear after 4000 rpm, boost rised form 0.7 bar to 1.5 bar, then ı slowed down, and tried wot again and boost was again low.

but the rich running is gone i think, because there is no unburnt fuel smell, and car revs smoot till redline. so here i am again with another problem




will do some investigations with vagcom

[murat]

did a vagcom run

car gave

00519 - Intake Manifold Pressure Sensor (G71)
06-10 - Signal to High - Intermittent
00519 - Intake Manifold Pressure Sensor (G71)
17-10 - Control Difference - Intermittent
errors together

when you wot about 2500-300 rpm, boost is at 0.5 bar in mid gears

after 4000 when i depress throttle to e.g. %20 and repress then car boosts 1.4 bar

if you wot from 2500 to redline, it stays at 0.5 bar till redline.

strange i cant think of anything, any ideas?????

seems like when car gets hot, problem is more severe, if its cold, it makes it sometimes bu when its hot, low boost is there all the time, unless i depress and repress after 4000 rpm.

dumb motronic

[murat]

i checked wastegate today, did a vacuum test with mityvac, it holds vacuum well

my suspect is mfts

how can i check if mtfs is faulty???

[murat]

oh btw,
on part throttle there is no limp home

but after about %80 throttle, limp home mode is there

before 4000 rpm, limp home is always there

[martinjs]

my suspect is mfts

how can i check if mtfs is faulty???

Just disconnect it and see if that changes anything.

[murat]

i have disconnected mfts, problem still continues, only change was the temperature gauge was not working.

[murat]

while i was replugging mfts, i saw that mfts connector is cracked, so maybe its making my intermittant boost problem


any part numbers for mfts connector???