[T3] Question about D jet idle issues 73 T3

[Jim Adney]

On 27 Jan 2016 at 19:53, William J wrote:

> From: "Jim Adney" <jadney at VWType3.org>
> 
> >I should have mentioned this much earlier, but have you checked
> > compression in each cylinder?
> 
>  Jim , no I haven't simply because this miss I speak of is not one cylinder 
> , all are affected . I pull each plug wire out of the cap the RPM drops the 
> same  amount . On top of this if one cylinder was weak it would not have the 
> power it does and I would feel it . If one were lower it would be either a 
> valve not seating or rings I see no evidence of either. I never find tight 
> valves or loose valves doing a valve adjust.

A small leak would have a larger effect at idle, when there's more 
time for the leak to have some effect, but I agree that if it affects 
all cylinders equally that cause seems unlikely. Still, it's worth 
doing a compression test.

Bob's suggestion about the temp sensor wire being too close to the 
(#4) plug wire might cause a problem with 2 cylinders, although I've 
never seen this problem (but that doesn't mean it's not a 
possibility.)

Head studs pulling out of the case could make 2 or 4 cylinders leaky. 
Sure would hate for that to be the problem.

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