Author Topic: Mk5 golf gti tfsi hesitation  (Read 1177 times)

Offline bobby_fodge

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Re: Mk5 golf gti tfsi hesitation
« Reply #30 on: October 04, 2019, 11:13:28 AM »
I've put 2 OEM LPFPs in over 5 years.  They're not the best!  They changed the design because people were getting fuel cuts on long journeys due to the pump overheating.  The fix was to basically remove the lid from the pump housing  :grin:

That's interesting Pudding, I first starting getting the cuts at the end of the long drive to the in-laws. I then got them at the end of the 25 mile drive to work until I was getting them after a few miles.

Offline muff1991

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Re: Mk5 golf gti tfsi hesitation
« Reply #31 on: October 04, 2019, 11:17:57 AM »
i only get cuts when the outside temps are low  :thinking: and even then i dont think its the pump  :smiley:

Offline Pudding

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Re: Mk5 golf gti tfsi hesitation
« Reply #32 on: October 04, 2019, 11:18:34 AM »
I've put 2 OEM LPFPs in over 5 years.  They're not the best!  They changed the design because people were getting fuel cuts on long journeys due to the pump overheating.  The fix was to basically remove the lid from the pump housing  :grin:

That's interesting Pudding, I first starting getting the cuts at the end of the long drive to the in-laws. I then got them at the end of the 25 mile drive to work until I was getting them after a few miles.

The first time I got fuel cuts was when blasting over roundabouts with aggressive camber changes when the tank was 1/4 or lower.  Stuck a new LPFP in and noticed the change of design.  That was 5 years ago and fixed the problem, and has been fine until recently and had to stick another one in.  Not sure if the second one has solved anything but looking at the state of the pump that came out, it was worth doing anyway.  Filthy and clogged with black crap.
Black Edition 30 with manually selected cogs, a beefier clutch, some extra boost and them Whiteline thingies, otherwise standard.

Offline Pudding

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Re: Mk5 golf gti tfsi hesitation
« Reply #33 on: October 04, 2019, 11:22:06 AM »
i only get cuts when the outside temps are low  :thinking: and even then i dont think its the pump  :smiley:

Are you still getting those weird problems?  Mine's been OK so far with the recent temp drops, but let's see when it's zero degrees  :grin:
Black Edition 30 with manually selected cogs, a beefier clutch, some extra boost and them Whiteline thingies, otherwise standard.

Offline muff1991

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Re: Mk5 golf gti tfsi hesitation
« Reply #34 on: October 04, 2019, 11:45:46 AM »
i only get cuts when the outside temps are low  :thinking: and even then i dont think its the pump  :smiley:

Are you still getting those weird problems?  Mine's been OK so far with the recent temp drops, but let's see when it's zero degrees  :grin:
yes mate, had 4000rpm cut last Friday so i know its lingering. Waiting for the colder weather to arrive more permanent for it start doing its spasticated professions again :) Once it does its first cold start stall and im getting bad hesitation again, i'll be looking into things more with VCDS. I didn't have VCDS till the winter was nearly over earlier this year. (still wont find it though, haha)
0 degrees or lower would be better as the colder it is the worse it is, so hopefully i'll spot something obvious.

Offline Pudding

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Re: Mk5 golf gti tfsi hesitation
« Reply #35 on: October 04, 2019, 03:41:09 PM »
How annoying! It does sound like some some more yawn inducing spreadsheets are required  :grin:  Happy to look them over for you again and as and when  :happy2:


Black Edition 30 with manually selected cogs, a beefier clutch, some extra boost and them Whiteline thingies, otherwise standard.

Offline Mackenzie79

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Re: Mk5 golf gti tfsi hesitation
« Reply #36 on: October 04, 2019, 05:41:44 PM »
I have receipts with the car that say its had the in tank fuel pump done. My prob is only at start up from cold. It got worse the other day, lasted longer than usual so took it for a blast that evening to burn off some carbon. The next morning the startup issue wasn't there and although since it has it hasn't been so bad.
I do alot of short journeys and usually stop start stuck in traffic plus its a tfsi known for bad carbon build up so getting it carbon cleaned tomo so fingers crossed. If not may get my mechanic to try the Mr muscle trick.
@muff1991 nah I took it down as it seems ridiculous lol. My mechanic assured me that putting dpf clean and regenerator in a quarter tank and idling it for 30mins and then taking it for a blast would clean the turbo. He said the guy he gets it from is a turbo specialist and it's tried and tested. Apparently it's the same stuff that's for cleaning turbos just bottled in a bottle stating diesels only. Didn't wanna take the risk plus already got treatment in my fuel atm.

Offline Pudding

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Re: Mk5 golf gti tfsi hesitation
« Reply #37 on: October 04, 2019, 07:50:39 PM »
I suspect it could be the injectors.  I think you said you had some misfire fault codes.  Lots of short journeys doesn't exercise the injectors, spark plugs get fouled and the engine just doesn't really get up to temperature.  If things improve after an 'Italian tune up', it's certainly a clue.  When the injectors start to go, it's usually the lower rev range that suffers.
Black Edition 30 with manually selected cogs, a beefier clutch, some extra boost and them Whiteline thingies, otherwise standard.

Offline Mackenzie79

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Re: Mk5 golf gti tfsi hesitation
« Reply #38 on: October 04, 2019, 08:42:36 PM »
Yes misfire on cylinder 2 injector they said. I guess if this is not historic as my mechanic thinks then itilain tune, injector/carbon cleaning, will not help? The Vagcom guy said replacing the injector alone wouldn't solve it as needed new turbo too.
If it was misfiring would it run smooth through every gear with no hesitation or misfire besides the initial bogging?
It's just passed its mot too so emissions all good

Offline muff1991

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Re: Mk5 golf gti tfsi hesitation
« Reply #39 on: October 04, 2019, 08:57:03 PM »
How annoying! It does sound like some some more yawn inducing spreadsheets are required  :grin:  Happy to look them over for you again and as and when  :happy2:
Thanks pudding, I sure will be leaning on you again mate! We’ll get to the bottom of it this year!


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Offline muff1991

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Re: Mk5 golf gti tfsi hesitation
« Reply #40 on: October 04, 2019, 09:01:16 PM »
Yes misfire on cylinder 2 injector they said. I guess if this is not historic as my mechanic thinks then itilain tune, injector/carbon cleaning, will not help? The Vagcom guy said replacing the injector alone wouldn't solve it as needed new turbo too.
If it was misfiring would it run smooth through every gear with no hesitation or misfire besides the initial bogging?
It's just passed its mot too so emissions all good
I thought I wasn’t going totally blind lol I see it but didn’t have time to reply, but in a nut shell it might be the same stuff, I wouldn’t bother risking it though. Don’t ever hear of anyone having to clean one of these turbos.i plugged mine in today and noticed on idle I was getting 1 to 2 misfires on cylinder 3 and 4 they’d disappear then one by one flag back up on the counter. I guess an injector clean/replacement and carbon clean might be something I’ll need to do too. We’ll get to the bottom of it mate.


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Offline Pudding

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Re: Mk5 golf gti tfsi hesitation
« Reply #41 on: October 05, 2019, 11:44:24 AM »
Yes misfire on cylinder 2 injector they said. I guess if this is not historic as my mechanic thinks then itilain tune, injector/carbon cleaning, will not help? The Vagcom guy said replacing the injector alone wouldn't solve it as needed new turbo too.
If it was misfiring would it run smooth through every gear with no hesitation or misfire besides the initial bogging?
It's just passed its mot too so emissions all good

Injectors are mechanical devices and can therefore misbehave intermittently. The pintles get gummed up and lazy.  It could just be a particular temperature and duty cycle they're not happy at.  These engines never misfire if all is well.  Misfires severe enough to flag a fault (it has to miss several times for that happen) it's certainly a clue.  I had an intermittent misfire on mine on cyl 3 at approx 90K miles which was a bad injector.  I just put another set of 4 in and it's never missed since, not once.

I'm not suggesting it's them 100% because you can't be certain over the internet, but at your mileage and the symptoms, they can't be outruled.

Unless the turbo has bad shaft wear (wobbly turbine wheel) I really wouldn't go there with that.  Focus on the cheaper, more fundamental issues first is my advice.  The turbo should be the last thing on the list as it's very expensive and they either work or they don't, kind of like a light switch.

I would give it several hard runs over a week and see what that achieves and go from there.  These engines really don't like short journeys.  Well, they can do them, but they prefer to get a lot of air through them and heat to blow the cobwebs away.

Coilpacks and plugs recent/good?

When my injector went, it didn't feel rough, just very flat and unwilling to rev.  The only clue was an occasional lumpy idle when hot.

Black Edition 30 with manually selected cogs, a beefier clutch, some extra boost and them Whiteline thingies, otherwise standard.

Offline Mackenzie79

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Re: Mk5 golf gti tfsi hesitation
« Reply #42 on: October 05, 2019, 02:19:50 PM »
If it was misfiring would I not feel, hear it? Is the initial feeling of hesitation considered a misfire or because its apparently got a sticky turbo? I know that cheaper readers are not as good as vagcom but to be honest myself and my mechanic don't trust what they've said. The garage had a lot of bad reviews.
My mechanic says it is not misfiring but doesn't understand why the initial hesitation is there. I had it carbon cleaned today and the guy said it wasn't misfiring and his reader showed no misfire/faults. Getting new filter, and oil flushed and changed Monday. Won't know if carbon clean has helped with cold start I guess till I cold start again but definitely felt more responsive when taking it out after the treatment.
Yeh had my plugs changed recently along with fuel filter, temp sensor, PCV and had a few of the sensors out for cleaning. I use shell high octane fuel and have intector treatment in at the min. He looked at coils and said they looked ok.
When I first bought it I was told it was remapped.. I messaged the guy I bought it off and he told me it had always done this and it was because it was remapped and the injectors were sorting themselves out, putting more fuel in. Could a bad map be the issue possibly? Thanks for the responses much appreciated