Low boost, back to normal after on/off

[bigpmcd]

Started the car Upto today, hadn't driven in about a day or so as I usually use everyday on several journeys. Anyway, once the car was running at optimised temperature, I noticed the car would not boost past 0.2 bar, felt extremely slow and I could hear the waste hate was alot quieter due to less air flow. I turned the car off and back on and it seemed to boost back to normal levels of 0.8/0.9 bar. What could cause this?

I have scanned the car, only code is the n249 as I have bypassed this, always been there. Also had a code for pressure drop between turbo and throttle body, I have a catch can and PVC delete fitted by myself. I deleted this code and seems to have not came
Back after a week or so.

I just wanted to know what the boost issue could be? Was thinking either DV or N75. Or a small boost leak in PVC system.

 

[Stuart B]

if there is a code for pressure drop between turbo and throttle body, isn't that in itself a boost leak?

you can plug in the bypassed N249 to stop the code appearing?

 

[bigpmcd]

Thanks for reply. I have recently plugged in the n249 and deleted the code but does seem to come
Back. I had a boost leak test done a month or so ago that came back pretty much perfect. Could be dirt in TB? I do need to change my OEM hose to silicone.

 

[badger5]

17705 faultcode?

 

[bigpmcd]

Hi badger, yeah this is the only code I now have after plugging n249 electronically. If I delete the 17705 code it comes back about a week later.

When I turn the car on when cold (done this past few days) it will only
Boost to 0.2 bar max. Even once it gets to full temp. If I take key out of ignition and restart its goes back to normal boost. So a little strange and intermittent. I'm sure I seen my esp light flashing when it was on 0.2 bar also.

 

[badger5]

17705 is in some maps.. but can be mapped out. but also I've seen it mapped out and still occur, and its fix was replace maf, then it went away