intermittent turbo fault any ideas?

[drance]

hiya all,

i have a 2002 leon 1.8 20v t cupra and i have noticed a problem it is fine to start with but after an hour or so the boost seems to have dissapeared completely although there is still some noise from the dv

but if i turn off the ignition and re-start the car it seems to cure it for a while at least

i am new to all this so any help would be really apreciated

david

 

[sambryant]

do you have a induction kit? if u do my first guess would be the maf sensor. im having the same problem.

 

[drance]

nope it doesnt have one yet ive only had it for a day any ideas how i would find out for sure

thanks for your reply

david

 

[dh00001]

sounds like limp mode

 

[LEE69]

You really need to get it on vag com or a scanner to see if any fault codes have been logged.

 

[sambryant]

i think a vagcom would be your best bet in that case

 

[drance]

right then next silly question, im in milton keynes any ideas where to get that done

 

[LEE69]

Ask in the vag com section.

 

[drance]

ok will do thank you all very much for the idea's

david

 

[Cupra-jb]

Same problem im having too

iv tried running it with the maf unplugged but still did it,im thinking it may be the n75 valve~?

my scanner shows 17705 pressure loss but i carnt find any leaks at all.

 

[LEE69]

Same problem im having too

iv tried running it with the maf unplugged but still did it,im thinking it may be the n75 valve~?

my scanner shows 17705 pressure loss but i carnt find any leaks at all.

Look at your pancake pipe.

 

[Ronin225]

I thought only LCs had a pancake pipe not LCRs

 

[Cupra-jb]

yep iv looked at the pancake poipe all seems ok only thing i can see that may be an issue with it is that its slightley shoved out the way by the tip.

dont know if anyone else has this issue but the guy at my local vag place said it should be really sat upright but the tip is shoving it forward if that makes sense?

could this be the isssue?

thanks.

 

[drance]

would having an atmospheric dumpvalve cause a problem i think the previous owner put one on that isnt a re-circulating dv

 

[LEE69]

I have one set up fine, but, if they are not they can cause problems.
Try reducing the tension on the spring.

 

[Cupra-jb]

lee69 any ideas if my pancake pipe been like it is an issue.

 

[drance]

was just wondering if it could cause a problem cos when im driving in 5th and accelerate fairly gently i can hear what i can only describe and a constant hiss from the dv

 

[drance]

it was the dumpvalve that was causing the problem i took it apart and the lower spring was broken so the valve was not closing properly and losing pressure hence limp mode