Accelerator (Jerking)

Gaston Casual Dubber

26 posts · joined Sep 2015 · 18 Dec 2015, 8:57 am

#1021987

Hey!

I am now the proud owner of a lovely '71 S Bug. Had her serviced and now runs exceptionally, which is a testament to the guys at Custom Vee Dub. My only concern is that when I release my accelerator pedal suddenly, like when changing gears, she jerks a bit before running smoothly again.

This doesn't happen every gear change (more prominent in the lower gears though), and I'm not sure if it was the way I was driving the car ( say, I need to be more gentle when bringing the accelerator pedal up than when compared to a "normal" car, or I need to be firmer with the accelerator when changing gears ) or whether the accelerator pedal or some other aspect needs to be investigated.

I should point out, just in case it is related, that the mechanic also noticed a flat spot in the carburetor, and had a play date with it to get it sorted. He was 90% happy with his work when I picked up the car, and said that if I had any problems with it that he'd get it sorted.

Oh, and thank you in advance for any replies, since I do appreciate it.

Gaston.

I hand out apologies like beating-red apples... Since trees can only bear fruit if it's root is planted in the soil of sincerity.

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 · 22 Dec 2015, 8:29 pm

#1022124

Is it running a 009 dizzy?

madness is in the eye of the beholder 👍

helbus Administrator Mad fabricator, paint and body

7,386 posts · joined Sep 2002 · 22 Dec 2015, 11:14 pm

#1022126

Smoothest running for a stock 1600 Twin Port will be an SVDA Single Vacuum Dual Advance distributor. They are available new for about $180. The original factory distributor for most 1971 1600's was vacuum only, no mechanichal advance. VW Australia replaced them under warranty they were so bad. Been through it all with our 1971 1600 last year.

EJ22 into Bay Microbus - Finished project build thread- click on this spot here for info

Gaston Casual Dubber

26 posts · joined Sep 2015 · 23 Dec 2015, 1:15 pm

#1022142

Thanks psimitar and hellbus, I think the distributor is my problem.

Its running a 009 (Bosch 0 231 178 009), which with further investigation from here (http://www.ratwell.com/technical/IgnitionSystem.html), based on your comments, would explain why the accelerator pedal is unhappy. The site also noted that it causes a flat spot near idle, which might be the culprit of the aforementioned flat spot.

So thanks for pointing me towards the distributor, and I will look into an SVDA single vacuum dual advance distributor for my little bug.

I hand out apologies like beating-red apples... Since trees can only bear fruit if it's root is planted in the soil of sincerity.

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 · 23 Dec 2015, 11:13 pm

#1022161

Cool beans dude 🙂

And just in case you wondered, cos it can confuse people, the DA of SVDA just means that the SV forms one of the advance mechanisms and the other is formed my a mechanical advance mechanism but isn't part of the acronym 🙂

madness is in the eye of the beholder 👍

AA003 Custom Title Time!

1,189 posts · joined Oct 2011 · 24 Dec 2015, 9:29 am

#1022173

I thought that SVDA was Single Vacuum Distributor Advance and DVDA was Dual Vacuum Distributor Advance? (But I am just guessing)

The dual vacuum distributors were a cheat to get around the Australian pollution laws. But Volkswagen wouldn't do that, would they?😁

I read it on samba, so it must be correct.

Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!😂

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 · 24 Dec 2015, 4:45 pm

#1022186

AA003 wrote:I thought that SVDA was Single Vacuum Distributor Advance and DVDA was Dual Vacuum Distributor Advance? (But I am just guessing)

The dual vacuum distributors were a cheat to get around the Australian pollution laws. But Volkswagen wouldn't do that, would they?😁

well most people seem to refer to a vac and mech dizzy as being an SVDA these days. Whether or not it's the correct use of the term, who's to say? 🙂

madness is in the eye of the beholder 👍

yasdnil01 Seriously Crusin Dubber

135 posts · joined Nov 2008 · 25 Dec 2015, 1:22 pm

#1022207

have them also check the gearbox front trans mounts as that can cause the
car to jerk if old and perished as it rubs the gas peddle cable

Gaston Casual Dubber

26 posts · joined Sep 2015 · 27 Dec 2015, 7:10 pm

#1022286

Thanks yasdnil01, I'll be sure to take that into account when I go to the shop next. I'll take a look at the distributor first, mainly due to the fact that it is an 009, and if that doesn't amend it the front trans mounts will be investigated.

Oh, and thanks again for all your help. Its been much appreciated.

I hand out apologies like beating-red apples... Since trees can only bear fruit if it's root is planted in the soil of sincerity.