no boost, help!

[cupra 1.8turbo]

hi, i bought cupra last week, when i got it, it was boostin between 20-25 psi, but now it only goes upto 0 psi, i also have the engine management light on along with the traction control light, any1 have any ideas??? cheers

 

[motty_90]

maf sensor normaly brings traction control light on, try unpluging maf sensor

 

[cupra 1.8turbo]

might sound silly, but is that the connector on the air intake pipe? if so i've unplugged it and it makes no difference on idle but i didn't drive it,

 

[motty_90]

Yes it plugs into the tip pipe. might be worth taking it for a drive with it unpluged. have you checked to see if there's any intercooler hoses off?

 

[cupra 1.8turbo]

ill go and give it a go and look for any loose hoses,

 

[cupra 1.8turbo]

un-plugged it, it made no difference, all the pipes r connected, n75?

 

[motty_90]

might be n75. do you know anyone with a vag com? thats probly your best bet with the engine management light being on. it might be in limp mode.

 

[fourtwofive]

vagcom....... i think a faulty n75 would do that clean the plug on your n75 maybe

 

[cupra 1.8turbo]

the person i bought the car off plugged it in last night, he is posting the results on here as we speak, in the mean time ill try cleanin the plug,

 

[motty_90]

have a look in the fuse box under your steering wheel, check fuse's under there. ive had a problem with fuse 8 i think before

 

[RabReith89]

Fuse 8 mate defo, Exact same happened to me.

 

[Ibiza125]

Depends what codes come up to see if it's fuse 8 or not. If there are lots of short errors etc then it will be.

If not then I would put my money on it being the MAF.

 

[cupra 1.8turbo]

fuse 8 had blown and the wire to the n75 had broke, so i repaired the wire and the traction control light went out, but its still running 0psi of boost, , any ideas????? the codes are in the vag com section, posted by benny,

 

[Ibiza125]

Replied in vag com section.

 

[__B3NNY__]

Its the 0psi thats confusing me, even with the n75 unplugged it should still boost on actuator pressure IE ~12psi.

The last time i saw 0psi was when i ended up with a washer trapped in the turbine of an old k03s after fitting and exhaust manifold about 2 years ago.

If you get chance before i see you tommrow try and take the turbo intake pipe off the coller of the turbo and make sure the turbine is still spinning freely with next to no movment in the shaft of the turbine.

 

[RabReith89]

fuse 8 had blown and the wire to the n75 had broke, so i repaired the wire and the traction control light went out, but its still running 0psi of boost, , any ideas????? the codes are in the vag com section, posted by benny,

Did u replace the fuse mate??

 

[cupra 1.8turbo]

replaced fuse and rapaired broken wire to n75, disconnected battery for 20 mins, all the lights have gone off but still no boost,

 

[daves ibiza]

thats wierd . so its bennys car you got isit mate .

 

[Big_daddy]

Can you hear turbo spool up/ dv sounding? have you checked the actuator arm tension?

 

[Spud_G40]

Yeh check the actuator rod on the turbo has'nt come completely loose. Happened to me on my k03S and I could'nt work out how I had no boost what so ever, until i noticed that, just ziltch. Sounded like a 1.2 12v.