Sweet as a nut MK2 - sudden loss of power on steep hill

Carbs; K-jet; Tanks; Lines; Filler necks, Senders; aftermarket fuel systems; Exhausts and Manifolds;air filters - standard and aftermarket

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WillGT21985
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Re: Sweet as a nut MK2 - sudden loss of power on steep hill

Postby WillGT21985 » Tue Sep 12, 2017 3:22 pm

Thanks, will check later. I've seen a small rust spot coming through inside the boot, the other side of the fuel filler neck, which is quite possibly cause by this.



DT1
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Re: Sweet as a nut MK2 - sudden loss of power on steep hill

Postby DT1 » Tue Sep 12, 2017 6:23 pm

It's not the filler pipe it's the bracket at the top of the wheel arch that the filler pipe is bolted onto, it acts as a collector of crud.

If there is any failure of the weatherproofing around the bracket you will end up with a rusty hole.



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scrappy1382
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Re: Sweet as a nut MK2 - sudden loss of power on steep hill

Postby scrappy1382 » Tue Sep 12, 2017 9:07 pm

im still gonna go with my post previously mentioned - the carb flange. driving normal = fine, put your foot down = judder, the throttle cable kinda pulls the carb forwards slightly, just enough to overtime cause a faint hairline crack at the back of the flange to allow too much air in and cause this issue. is the throttle cable nice and smooth/easy to accelerate/ push pedal down ? or stiff ?

this

https://www.google.co.uk/search?q=vw+sc ... 1LoGotjOlM:


scirocco shane
84 cosmos blue storm - mafia car choice 2015
88 scala 1.8 agu turbo. ( ants old car )
84 Havanna Brown Storm - minter and keeper 8-)
85 Monza Blue gtx tdi - Smokey joe :twisted:

WillGT21985
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Re: Sweet as a nut MK2 - sudden loss of power on steep hill

Postby WillGT21985 » Thu Sep 14, 2017 3:12 pm

Hi Scrappy,

I took it into the garage to check the fuel lines/filter/tank etc, and it's come back with a clean bill of health. So, everything up to the carb has been checked and is fine.

So, I'd like to investigate your angle next. It's worth noting that a few weeks back, before the issue on the incline, the car briefly began to rev at approx double it's typical level on a short journey home. It's not done this since, but perhaps the two incidents are related? It reminded me when you mentioned 'overtiming' in your comment.

Would this be a specialist job? My mechanic didn't seem keen to delve into the carb with everything appearing to be running fine. I appreciate and respect his point of view of course, but I'd ideally like to nip this issue in the bud, rather than fear accelerating up a hill!



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unknownmale
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Re: Sweet as a nut MK2 - sudden loss of power on steep hill

Postby unknownmale » Thu Sep 14, 2017 6:33 pm

Does this still happen with a full tank?

You can test the carb flange issue will moving the carb left to right and forwards and backwards with the car running. listen to see if the engine stumbles, this would indicate a vacuum leak, most likely the carb flange. But don't rule out the vacuum lines near by.


- David

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unknownmale
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Re: Sweet as a nut MK2 - sudden loss of power on steep hill

Postby unknownmale » Thu Sep 14, 2017 6:38 pm

Sticking float in the carb on the pin or needle and seat are still a possibility due to it only happening on an incline.

I've had this exact issue with motorbikes.


- David

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scrappy1382
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Re: Sweet as a nut MK2 - sudden loss of power on steep hill

Postby scrappy1382 » Thu Sep 14, 2017 8:53 pm

WillGT21985 wrote:Hi Scrappy,

I took it into the garage to check the fuel lines/filter/tank etc, and it's come back with a clean bill of health. So, everything up to the carb has been checked and is fine.

So, I'd like to investigate your angle next. It's worth noting that a few weeks back, before the issue on the incline, the car briefly began to rev at approx double it's typical level on a short journey home. It's not done this since, but perhaps the two incidents are related? It reminded me when you mentioned 'overtiming' in your comment.

Would this be a specialist job? My mechanic didn't seem keen to delve into the carb with everything appearing to be running fine. I appreciate and respect his point of view of course, but I'd ideally like to nip this issue in the bud, rather than fear accelerating up a hill!


ok, couple of easy steps. diy level 1 being easy 5 being hard, this is a 2-3. pretty simple. suprise your mechanic doesnt want to take the job on actually.

https://www.google.co.uk/search?q=vw+go ... PJoYfvZ6LM:

notice at the very front of the carb, you will see the flange bolt. ? well, you should see just under the earth strap blue cover a nut ?,,, remove all those around the carb, from there you should see the nuts holding the flange onto the inlet mani. remove those and give the flange a tap to remove, ( may struggle alittle )

https://www.google.co.uk/search?q=vw+go ... A7vWjQ8MTM:

https://www.google.co.uk/search?client= ... tfNt6dpt8M:

replace flange, and put back together.


scirocco shane
84 cosmos blue storm - mafia car choice 2015
88 scala 1.8 agu turbo. ( ants old car )
84 Havanna Brown Storm - minter and keeper 8-)
85 Monza Blue gtx tdi - Smokey joe :twisted:

Moved from Mk2 Scirocco to Fueling and Exhaust on Thu Oct 05, 2017 10:57 am by the edmundator


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