MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Scotsman on January 21, 2011, 10:55:56 am

Title: Coilpacks didn't fix the problem :(
Post by: Scotsman on January 21, 2011, 10:55:56 am
I was having misfire/hesitation under acceleration so just fitted new coilpacks - which seemed to fix the problem after I took the car out for a 5 min drive - however, then didn't drive it again until today as I was waiting for new engine cover grommets as two of mine were knackered.  Just fitted them, nice tight fit now and took the car out.

Still bad misfire/hesitation on part throttle when accelerating  :confused: :sad1:

Car starts fine, idles great, smooth when driving on part throttle keeping a steady speed, but any acceleration (worse in high gears at low speed) on part throttle causes misfire/hesitation.

Any ideas on cause? (aside from one of my new coilpacks being the issue).  Spark plugs? fuelling?

Many thanks
Richard.
Title: Re: Coilpacks didn't fix the problem :(
Post by: S2 Ant on January 21, 2011, 10:58:08 am
Is your car running the stock map or has it been remapped?
Title: Re: Coilpacks didn't fix the problem :(
Post by: Scotsman on January 21, 2011, 11:01:18 am
Running the stock map - though for interest when I flashed it with Bluefin 4 months ago I had some hesitation on full throttle, so just flash it back to normal and it was fine (until now). A couple months before that when I was running the bluefin map for a few days I didn't have any problems.

Didn't keep the bluefin map on the car as it was going to be a £200+ uplift to my insurance and I didn't think it was worth the cost at that time (I'm only paying £190 fully comp).
Title: Re: Coilpacks didn't fix the problem :(
Post by: PDT on January 21, 2011, 01:27:39 pm
 a datalogging session should show up the fault.
Title: Re: Coilpacks didn't fix the problem :(
Post by: vRS Carl on January 21, 2011, 01:31:37 pm
I had this problem recently and it was the Spark plugs.

This was after a data logging session which wouldn't show the fault as the car doesn't log Spark Plug faults permanently. It will only show up when you log blocks 015 & 016 but it resets itself all the time.

I'd suggest getting a new set of plugs and try that :happy2:
Title: Re: Coilpacks didn't fix the problem :(
Post by: Scotsman on January 21, 2011, 01:49:02 pm
Thanks guys - I'll try the spark plugs first and if no joys after that then I'll go to the garage.

I think the right type is 06H 905 611 - though I'll have a look through my old service receipts to see when/if they were last changed (2005 car with 37k).  Are they easy to change on the GTi?

Cheers
Richard
Title: Re: Coilpacks didn't fix the problem :(
Post by: Scotsman on January 21, 2011, 01:52:15 pm
Just found this guide on how to change them:

http://www.golfmkv.net/blog/archives/9#

Title: Re: Coilpacks didn't fix the problem :(
Post by: vRS Carl on January 21, 2011, 01:58:53 pm
Piece of pi55 to change.

Remove engine cover, Disconnect and remove coilpacks, Remove old Plugs, Insert new plugs, replace coilpacks & re-connect Coilpacks, Replace engine cover, Job Done

The correct Part no. for a GTi is - 101 905 631 H
Title: Re: Coilpacks didn't fix the problem :(
Post by: Scotsman on January 21, 2011, 01:59:52 pm
Piece of pi55 to change.

Remove engine cover, Disconnect and remove coilpacks, Remove old Plugs, Insert new plugs, replace coilpacks & re-connect Coilpacks, Replace engine cover, Job Done

The correct Part no. for a GTi is - 101 905 631 H

Thanks again - gives me an excuse to buy the correct tools for the job too :)

Ordered from the local dealer and picking up on Monday - £43.26 for four.
Title: Re: Coilpacks didn't fix the problem :(
Post by: Hurdy on January 21, 2011, 07:55:11 pm
If this doesn't sort it then it could be either the PCV or the N75 valve. :smiley:
Title: Re: Coilpacks didn't fix the problem :(
Post by: Scotsman on January 21, 2011, 08:59:01 pm
If this doesn't sort it then it could be either the PCV or the N75 valve. :smiley:

Thanks Hurdy.
Title: Re: Coilpacks didn't fix the problem :(
Post by: jmspear on January 21, 2011, 10:38:35 pm
#2 PCV that what is was on my GTI, cheap and easy fix to replace, with new upgraded PCV from VW
Title: Re: Coilpacks didn't fix the problem :(
Post by: Scotsman on January 22, 2011, 07:12:04 am
#2 PCV that what is was on my GTI, cheap and easy fix to replace, with new upgraded PCV from VW

Thanks - I'll change that at the same time I'm doing the plugs - I've just read that it's recommended anyway to get a later revision.

Here is a handy guide I found on fitting them: http://vagdrivers.net/forums/index.php?showtopic=40537

I think the correct PCV part number is:   06F 129 101 L 

Cheers
Richard
Title: Re: Coilpacks didn't fix the problem :(
Post by: DelB on January 22, 2011, 08:54:30 am
Hi Richard. Sorry to hear you're still having an issue with the car, but good to know it's not the coilpacks!  :wink:

I e-mailed Jim at Star Performance at the tail end if last year to describe the same symptoms and he said it sounded like 'the valve at the top of the engine'. I haven't yet had time to go and see him about it, bit will get him to attend to it early next month as the car is due a service then anyway. Is this 'valve at the top of the engine' the PCV which is mentioned in Hurdy's post?

Cheers mate.  :happy2:
Title: Re: Coilpacks didn't fix the problem :(
Post by: Scotsman on January 22, 2011, 09:43:19 am
Hi Richard. Sorry to hear you're still having an issue with the car, but good to know it's not the coilpacks!  :wink:

I e-mailed Jim at Star Performance at the tail end if last year to describe the same symptoms and he said it sounded like 'the valve at the top of the engine'. I haven't yet had time to go and see him about it, bit will get him to attend to it early next month as the car is due a service then anyway. Is this 'valve at the top of the engine' the PCV which is mentioned in Hurdy's post?

Cheers mate.  :happy2:

Yes, that's the PCV value - photo of it here: http://vagdrivers.net/forums/index.php?showtopic=40537

Just phoned the dealer looking for one and it appears its currently on back-order - so looks like I've trying the plugs first!
Title: Re: Coilpacks didn't fix the problem :(
Post by: mlr55 on January 24, 2011, 07:58:44 am
Sorrry to hijack the thread but im having a 'fueling issue' according to vw and they cant find the fault so im clutching at straws! Could this pcv fault be the cause of it? Im not sure what the problem actually is as vw have had the car over a month.

Sorry to be so vague, more can be seen in my 'huston we have an unsolveable problem' thread.

Thanks Martin
Title: Re: Coilpacks didn't fix the problem :(
Post by: Scotsman on February 01, 2011, 09:47:56 am
Finally got round the changing the spark plugs and that seems to have sorted out the problem - many thanks to everyone for their advice and input  :happy2:

Car is running sooo much smoother now - amazing how you don't notice things getting rough when it happens over a long time.