MK2 Scirocco B759 MEC

Discussion relating to the Scirocco 1982-1991 - - please ask technical questions in the technical/trouble shooting section

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jskinner97
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MK2 Scirocco B759 MEC

Post by jskinner97 » Thu Sep 03, 2020 6:17 pm

Hi Guys, Ive gotten myself a bit of a project, From a previous owner. It's one of only 3 known capri blue MK2 Scirocco GT's...
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It was laid up a while, so will need a lot of tinkering. Anyhow, Im a ford man, So i've never touched a VW, yet alone the dreaded Pierburg...

A few questions... Presumably the choke flap should be FULLY CLOSED on a cold start? and slowly open up as the car warms up?
Am I missing a spring from the choke mechanism, or did I dream it??
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Secondly, am I missing a grommet, The throttle cable seems very slack and doesn't have much "spring" in it. I can't really identify the correct cable route if i'm honest...
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Cheers!



mark1gls
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Re: MK2 Scirocco B759 MEC

Post by mark1gls » Thu Sep 03, 2020 10:42 pm

There should be some play in the throttle cable as if it’s to tight when you floor it the J hook on the end of the cable attached to the pedal bends and comes off the pedal and you lose all control of the throttle which is not ideal. To set it up you need to make sure the engine is off, fully open the throttle and check the pedal is on the carpet.

Not up on the Pierburg carb as I switched to the Webber carb many years ago but Yes the flap should be closed and slowly open up when the car warms up, there is a wax stat in the carb which seems to fail as it’s a common problem, google Pierburg carb as same set on Mk1 Golfs as well as Scirocco.


Mk1 78 Scirocco GLS 1.6 FR, weekend toy.
Mk1 88 Golf GTi cabriolet 1.8 DX. Daily drive.
Membership No. 323

mark1gls
Posts: 3438
Joined: Thu Apr 02, 2009 9:28 pm
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Location: Somerset

Re: MK2 Scirocco B759 MEC

Post by mark1gls » Thu Sep 03, 2020 10:45 pm

The carb should have a spring on it to pull the throttle up, could be the spring has got weak over time?


Mk1 78 Scirocco GLS 1.6 FR, weekend toy.
Mk1 88 Golf GTi cabriolet 1.8 DX. Daily drive.
Membership No. 323

GT_II
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Re: MK2 Scirocco B759 MEC

Post by GT_II » Fri Sep 04, 2020 1:22 am

I haven't checked, but I suspect the choke may not be fully closed in warm weather. The choke's vacuum pull-down unit should open the choke by a few millimeters once the engine starts. if you remove the choke body from the mounting frame by undoing the three small screws from its retaining ring, this will reveal the choke's bi-metallic spring, which responds to heat from the coolant flowing trough the choke body as well as a little electric heating coil. The end of the spring hooks over the end of the choke operating lever. There is an engraved line and dot to show the correct orientation when refitting the choke body. Assuming the spring has not been tampered with, you shouldn't need to make any adjustments from this position.

The wax stat controls the throttle idle position during warm up - it works independently of the choke, though also controlled by coolant temperature.

The 2E2 service manual is here:

http://vwa1.dadoghouse.com/wp-content/u ... uction.pdf

Precise settings for individual engines are available here:

https://www.ruddies-berlin.de/Vergaser2E2.htm