MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Stig_gti on January 19, 2018, 10:45:57 am

Title: Running issues.
Post by: Stig_gti on January 19, 2018, 10:45:57 am

Morning
Had my stage 2 done at r tech before Xmas mk6 golf gti.
Everything was fine and for the last few weeks the only way I can explain it is, when on part throttle around 2 to 3k rpm I’m getting terrible surging and the power bogs down. Then all of a sudden it just fine and tears up the road.
Checked for fault codes non found. Any suggestions, full tbe exhaust power valve vwr intake, and gfb dump valve fitted last year. Never had the problem on stage 1.

Title: Re: Running issues.
Post by: pudding on January 19, 2018, 11:32:10 am

What engine does your MK6 have?  EA113 or EA888?

When you say on part throttle it surges, do you mean it's hunting and can't hold a steady rpm to match a steady pedal position, or do you mean it bogs down when you tip into the boost?

Title: Re: Running issues.
Post by: Stig_gti on January 19, 2018, 02:56:11 pm

It’s the ea888.
So on part throttle it  bogs down and has no power and then of a sudden the powers back. It seems to happen just happen between 2 and 3k rpm just as boost come on.

Title: Re: Running issues.
Post by: mo on January 19, 2018, 03:03:24 pm

Sound like your Maf is dying try running some logs if you have vagcom.

Title: Re: Running issues.
Post by: pudding on January 19, 2018, 04:22:36 pm

Do all the usual checks.

Fault code scan
Plugs
Coils
Long term fuel trims
Chain wear correlation (cam sensor position, usually block 93)
PCV
Boost leaks
High and low fuel pressure checks
VVT function
etc

I had exactly the same problem with my ED30.  In my case it was too much boost, too soon.  My fault, I did ask for a very aggressive map  :grin:   It was great on the day of the mapping, but over the following days that surging you describe started to kick in and got progressively worse.  The ECU adapted to the changes - in a bad way.  It didn't understand the massive load request and pulled it back somewhat aggressively.

It's all fine with a new map now.

Don't know if you have the same issue or not, but perform the hardware checks first.   If they all check out fine, it can only be the recent software change.

Title: Re: Running issues.
Post by: Stig_gti on January 19, 2018, 05:46:25 pm

Thanks for the help I will get it booked in to a garage hopefully aks.
But depends on waiting times. Will put up the results once sorted. :happy2:

Title: Re: Running issues.
Post by: Stig_gti on February 26, 2018, 04:05:12 pm

Cars going into aks tuning on Friday the 9th of March will come back with what the issue was if found.