[V8] hard starting sometimes and fluctuating idle

[George Tur]

On Tuesday 14 March 2006 19:22, Buchholz, Steven wrote:
> ... as already discussed, reading codes might give some key clues ...
>
> I would recommend that you pull the ISV to see if it happens to have any
> oil in it, and if so, clean it out.  I have most definitely seen cases
> where the ISV is sticky, and it causes symptoms very similar to the ones
> you describe ... once the ISV has had some exercise it works fine, but it
> gets sticky after sitting for a while.  I think the FPR might be a bit more
> of a stretch.  Remember that all this thing is doing is setting the
> pressure in the fuel rails dependent on the manifold pressure ...
>
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Just an update, I cleaned the ISV using carb cleaner and the fluctuating idle 
symptom has gone away. The rotating or sliding part in the ISV was completely 
coated in a black carbon/oil residue and it took a few applications of the 
cleaner and cycling with a battery to get it to look nice and shiny.