[T3] Question about D jet idle issues 73 T3

Jim Adney jadney at VWType3.org
Tue Jan 26 15:21:03 PST 2016


On 26 Jan 2016 at 14:53, William J wrote:

> Has anyone run across issues with an unstable idle that clears up with
> the IAD temp sensor is unplugged ? It only shows up when there is no
> load auto trans in park engine warmed up . If I give it gas from 900
> RPM idle speed and watch the tach for lack of a better term it seems
> to stuggle until it reaches 2000 RPM. 

Any chance this engine was rebuilt using Beetle intake manifold 
gaskets rather than the correct Type 3 ones? Dual port Beetles used a 
metal gasket there, but FI type 3s have a special bakelite 
spacer/gasket that's about 4 mm thick. If the Beetle gaskets are used 
there, they don't seal; they leave a vacuum leak that leads to lean 
running.

Another possibility would be insufficient fuel pressure. Have you 
checked it? Should be ~30 psi for a '73.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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