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Volkswagen Air-Cooled VW: 1952-1979 1976 Volkswagen Beetle fuel injection idle adjust


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Last Post: Jul 9, 2013 7:53 AM Last Post By: Thomas Williams
dpw21562

Posts: 2
Registered: 05/17/13
1976 Volkswagen Beetle fuel injection idle adjust
Posted: May 17, 2013 4:13 PM
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I have a 1976 Volkswagen Beetle with fuel injection that idols extremely fast. how do you adjust the idle speed
FKH161

Posts: 7,610
Registered: 12/29/05
Re: 1976 Volkswagen Beetle fuel injection idle adjust
Posted: May 17, 2013 6:56 PM   in response to: dpw21562 in response to: dpw21562
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There's a large round idle speed screw at the base of the throttle bore. Use a flat head screwdriver to turn it... "in" decreases speed, "out" increases the speed.

You need to make sure that the idle is not held high by the "deceleration valve", disconnect the vacuum hose going to the valve and see if the idle now comes down.

Also check the timing, vacuum advance & the mechanical advance in the distributor.

A gas cable that is too tight can also cause high idle issues.

Lots to check...
tcovenant2000

Posts: 1,761
Registered: 12/09/03
Re: 1976 Volkswagen Beetle fuel injection idle adjust
Posted: May 18, 2013 9:26 AM   in response to: FKH161 in response to: FKH161
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Also, if it's only symptom is high idle, you want to make sure there are no vacuum leaks to the intake manifold. They will cause high idle and possibly misfire at speed.

Thomas
dpw21562

Posts: 2
Registered: 05/17/13
Re: 1976 Volkswagen Beetle fuel injection idle adjust
Posted: Jun 9, 2013 11:06 PM   in response to: FKH161 in response to: FKH161
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Where can I find a photograph showing the screw location? Thanks.
FKH161

Posts: 7,610
Registered: 12/29/05
Re: 1976 Volkswagen Beetle fuel injection idle adjust
Posted: Jun 10, 2013 1:37 AM   in response to: dpw21562 in response to: dpw21562
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Google image search is the bomb!

http://images.thesamba.com/vw/gallery/pix/724707.jpg

See the screw?

You might also want to check the "auxiliary air regulator" to make sure that it closes as the engine warms up.
Thomas Williams

Posts: 4
Registered: 04/18/13
Re: 1976 Volkswagen Beetle fuel injection idle adjust
Posted: Jul 9, 2013 3:46 AM   in response to: dpw21562 in response to: dpw21562
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A friend of mine had the same issue with the same Beetle model, and he found out that there are vacuum leaks to the intake manifold. He brought it to a nearby mechanic, and found out that there are further auto parts that needed replacement. In the end, he got brand new parts for the Beetle and it is not up and running. But from what I heard that the auto parts are a tad pricey because you can rarely find these anymore, unless you do not mind spending a lot.

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Edited by: RickW on Jul 9, 2013 7:53 AM


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