MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Haashim on April 09, 2020, 07:34:56 pm

Title: Boost issue
Post by: Haashim on April 09, 2020, 07:34:56 pm
Hi,

Everytime I’m on the motorway and put my foot down I get to about 120 and the car just shakes and looses all power like it’s going into limp mode. Only happened after I got stage one. Went back and he said it was pulling back timing a little bit but he said it’s down to the car and not the map. Got codes below. Any ideas what I need to change to get it back up and running properly. Haven’t even been able to test it since getting it mapped 😭😭

Codes: 01089 evap emission control system incorrect flow P0441 lower limit reached - intermittent
00135 fuel rail/system pressure too low P0087 lower limit reached - intermittent
00655 boost pressure regulation control range not reached P0299 - lower limit reached.

Any help would be greatly appreciated.
Title: Re: Boost issue
Post by: ROH ECHT on April 12, 2020, 04:06:07 am
I would rather see a print of the actual error codes showing the mileage stamps and frequency of errors. Because some codes may just be a result of another and so it is nice to know which code appeared first and how often it was reported. You can also visit VCDS and enter codes there in the search box for more info; http://wiki.ross-tech.com/wiki/index.php/16825/P0441/001089
Title: Re: Boost issue
Post by: Haashim on April 17, 2020, 10:39:19 pm
I have a picture of the codes from a snap on diagnostic machine but can’t figure out how to upload it on here. The boost pressure has only recently come up as before I only had the evap and the fuel rail issue.
Title: Re: Boost issue
Post by: ROH ECHT on April 21, 2020, 05:15:02 am
Quote from: Haashim on April 17, 2020, 10:39:19 pm
I have a picture of the codes from a snap on diagnostic machine but can’t figure out how to upload it on here. The boost pressure has only recently come up as before I only had the evap and the fuel rail issue.
I believe pics can only be loaded from photo hosting site...I use Flickr.

Possible Causes
 
With that said, if no noise such as grinding sound, then the turbo is likely OK.
Usually a failed N75 doesn't allow boost to build only if it has cracked or developed a leak in a hose. If it is failing electrically, it may not build as much boost as it once did and may rise and fall.
So I would remove and have a look at the DV-N249 and inspect all of the boost plumbing connections from the turbo to the throttle body.

This vid shows a DV with a torn diaphragm. It doesn't show how a revision-D's piston fails. If it is rev-D, piston type, it fails when the composite piston inside breaks inside;