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Hey! Hoping someone can help shed a Light on my issue.. So my old turbo went out and i bought a new renovated is38 from a friend and installed it, car drove fine after install for a day or 2 and then from no where the car shakes and limps when getting on boost

Realised i didnt do a waste gate adaption. So i set the voltage to 3.6 and it aborts the adaption for safety reasons. So i install my old accutator which i know worked before, but same issue. I hear the waste gate working for 3 seconds then it aborts for safety reasons

And i have checked the pivot arm moves freely when disconnected

Anyone got a clue where i go from here?..
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Golf mk4 / Re: ARL Boostleak whistle
« Last post by bogwoppit on Today at 10:10 »
Did the smoke test also pressurize the system?

If not, you need to try something like this, and then go around all the joints squirting soapy water on them to look for bubbling

https://www.youtube.com/watch?v=ijJNKXwxKco&t=202s
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Golf mk4 / Re: ARL Boostleak whistle
« Last post by Napalm on 10 January 2026, 18:09 »
I dont know, i bought the car with the issue, however its top speed is only 121mph, factory its 137mph,
Update: ive had a smoke test done, reault was inconclusive, no smoke leaked out. Really stumped here guys


137mph are you dreaming  :grin and any idiot doing that in an old mk4 deserves a slap

Cheers for that mate, looking for advice on to stop the whistle when the turbo kicks in lol
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Golf mk7 / Re: What have you done to your MK 7 today ?
« Last post by SuperScaff on 10 January 2026, 17:19 »
Fresh set of Ina cam adjusters and seals bit of preventative maintenance

 

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Golf mk8 / Re: Mk7 GTI spare wheel and tools into mk8?
« Last post by alland on 10 January 2026, 09:53 »
I had the same experience trying to get a space saver for my Mk8 GTI - this after bursting a tyre on a pothole 60 miles from home and having to rely on VW Assist / AA to get me home.
I got a space saver with Continental tyre plus complete tool kit at my local breakers - or "vehicle recyclers" as they like to be known now. £60 plus VAT for the lot, and they even checked that it would fit over the front calipers!

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Golf mk7 / Re: What have you done to your MK 7 today ?
« Last post by A-Kai on 10 January 2026, 00:09 »
Fitted some actual winter tyres and drove to the northern most part of The Netherlands, where it’s been dumping fresh powder every day. Fair to say that my PS4S’ would’ve killed me by now. Bonus: there is something oddly satisfying about a white car on fresh snow.





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Golf mk7 / Re: Battery low voltage
« Last post by scottm1 on 09 January 2026, 18:10 »
I can get a new battery from Halfords but wondering will they code it? The guys at VW said you don't need to do this but tbh not sure I trust them!

The following from Halfords website - Halfords Start/Stop batteries in some vehicles require the battery to be registered with the on-board computer system, so we strongly recommend professional fitting.

It needs doing so perhaps call the branch in advance and check.

Thanks mate, will call them. VW wanted £360 for a new one, maybe see how it is over the weekend and try a garage that I normally use.
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Golf mk7 / Re: Battery low voltage
« Last post by Watts on 09 January 2026, 18:02 »
I can get a new battery from Halfords but wondering will they code it? The guys at VW said you don't need to do this but tbh not sure I trust them!

The following from Halfords website - Halfords Start/Stop batteries in some vehicles require the battery to be registered with the on-board computer system, so we strongly recommend professional fitting.

It needs doing so perhaps call the branch in advance and check.
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Golf mk7 / Re: Battery low voltage
« Last post by scottm1 on 09 January 2026, 17:35 »
Just jumping on this, have a MK7.5 PP 5 years old and got a low battery on Sunday and it wouldn't start. Jumped it and it has worked all week but took it to Halfords for a test and they said it's at 48% and needs replaced.

It has been running fine this week and had it in at VW for an MOT today, vehicle health report showed no issues with the battery. Went to start it to leave VW and the battery had died again and needed to get them to jump it!

I can get a new battery from Halfords but wondering will they code it? The guys at VW said you don't need to do this but tbh not sure I trust them!
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Golf mk7 / Re: acceleration hesitation
« Last post by greencode on 09 January 2026, 16:22 »
Two estimates, so far, for the clutch and flywheel. OEM which is Sach. £1300 and £1600!
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