Acceleration woe\'s at low rev\'s

Josephk86 Learner Dubber

2 posts · joined Jun 2007 · 18 Jun 2007, 4:33 pm

#597697

Hi All

Just found the board, it looks like a great place! I'm sure I will spend a great deal of time here.

Anyway, to introduce myself I drive a 1973, 1600CC Beetle. I've had the car for about 7 years, I learnt to drive in it so it's already been through a bit. I am fairly mechanically minded, I try to do as much as I can myself but I'm still learning the art.

I am have had some issues with acceleration. The car seems to have no guts at low rev's, it just coughs and backfires till the rev's build up. Once the rev's are a bit higher the car seems ok. My mechanic suggested that because of the recent damp weather in Sydney, the smallest jet is blocked/obstructed, after purchasing some fuel addative I'm not convinced this will solve the problem.

Any advice would be great

Cheers

Joseph

[ Edited on 18-6-2007 by Josephk86 ]

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 · 18 Jun 2007, 5:40 pm

#597710

Welcome

If you are fairly mech minded - do a tune up yourself.

Read here....
http://www.vw-resource.com/procedures.html

You need to make sure all valves, timing etc etc are right.

Now - has it ever run right??
Is this something that just started??

Is it stock? or modified?

Are all hoses hooked up?
Choke stock on your carby??

Regards

Barry

Futue te ipsum!!!

Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 · 18 Jun 2007, 5:58 pm

#597713

is it your manifold icing up in the recent cold? does it do it every winter?

62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom

Josephk86 Learner Dubber

2 posts · joined Jun 2007 · 18 Jun 2007, 6:44 pm

#597727

Hi Guys,

Thats for the speedy reply. The car usually takes 15 or so minutes to warm up in the cold weather but it's usually fine afterwards. The car ran perfectly till about 2 weeks ago when everything just went down hill. The cold weather made things worse but I don't think it caused the initial problem. Yeah, the car is stock, its got a reconditioned 1600 which is about 8 years old now, everything is hooked up, I had a new twin pipe exhaust put on about 1 month ago but that shouldn't have made a differance?

ctefeh Wolfsburg Wizard

479 posts · joined Apr 2005 · 18 Jun 2007, 7:02 pm

#597734

Josephk86,
What Anthiron is alluding to is that your heat risers on your intake manifold may be blocked, causing the carby to ice up. To test, start the donk, leave it run for a bit. Now you should put your fingers near where the inlet manifold pipes join to the muffler. The right hand side (as looking in the engine bay) should be hot, the other side maybe a little cooler, but definitely not "barely warm" or cold.

If you have the 009 distributor, it may not be playing well with your 34 Pict 3 Carby. Check the website Bizarre listed to see what I mean. Ditto for checking choke function/adjustment etc etc.

Do the basics as per vw-resource, check out things and adjust as per spec, then let us know whether you've still got problems.

Ctefeh

Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 · 18 Jun 2007, 7:04 pm

#597737

sorry i should have been more clear.

62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom