Dual Dells car shakes just off idle

bus914 Custom Title Time!

1,230 posts · joined Aug 2002 · 11 Dec 2009, 10:35 pm

#751848

Video clip here

Is there something wrong with the carbs, are they out of balance or is it something else?

[img]https://i4.ytimg.com/vi/KOKlJpsfCyk/default.jpg[/img] Click the thumbnail for video👍

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 · 12 Dec 2009, 6:43 am

#751884

Blocked idle or water in fuel?

Have they evaer worked??

It is unlikey they go out of tune by themselves

Futue te ipsum!!!

bus914 Custom Title Time!

1,230 posts · joined Aug 2002 · 12 Dec 2009, 12:16 pm

#751919

Any diagnostics that you could recommend to narrow it down?

It idles smooth, but just when I'm giving it a little to engage the clutch it starts to wiggle at the back. Mid range and top end pulls well and smooth.

In the video you can see a couple of times the rear wiggles side to side.

[img]https://i4.ytimg.com/vi/KOKlJpsfCyk/default.jpg[/img] Click the thumbnail for video👍

Sides Veteran Volks Folk

2,220 posts · joined May 2007 · 12 Dec 2009, 12:25 pm

#751922

Have you got the carbs sync'd properly, and are the butterflies opening at exactly the same time and rate ???

Anything out of whack there would show up more at low throttle openings, which is I think what you're describing...

Engine off, throttle cable disconnected, return springs unhooked, your linkage should work smooth and accurate - think swiss clock.

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bus914 Custom Title Time!

1,230 posts · joined Aug 2002 · 12 Dec 2009, 5:59 pm

#751989

Ah yes, I took the linkage off to replace a perished fuel line not too long ago. That may have done it.

[img]https://i4.ytimg.com/vi/KOKlJpsfCyk/default.jpg[/img] Click the thumbnail for video👍

Sides Veteran Volks Folk

2,220 posts · joined May 2007 · 12 Dec 2009, 6:36 pm

#751992

Yup - pretty likely.

Ideally you want the butterflies on the two carbs to open at EXACTLY the same time and rate... if they don't you've effectively got one side of the engine making more power than the other, hence the shake.

When you've got the carbs sync'd and the linkage right, you'll be amazed how much difference it makes.

VWDCQ vice pres & web dude - vwdcqinc.org.au
Join a car club - get car peeps

My toys
'70 Hillclimb Bug 'Jezebel' w/- Haltech EFI - http://bit.ly/VwTNtQ
'60 KG Coupe - resto kinda started
01 New Beetle - gf's car, but I turn the spanners