[T3] '72 FI won't idle down

[Jim Adney]

On 13 Jun 2026 at 20:33, David wrote:

> Well, Jim - you owe me a beer  In my original post I said " I have the ´72
> decel valve installed & working, but plugging it for a test showed no
> issues." 

Okay, sounds like you got me. I'll pay up at the invasion, but I'll want to see 
this in person first. You know, "Trust, but verify!"  ;-)

> Otherwise this engine runs so good & strong. I know this all sounds like a
> leak on the intake side, but what if it is too much fuel being sent instead
> of too much air? 

The same thought crossed my mind. Did you drill a small hole in your 
pressure regulator like I've suggested to others in the past? Do you have a 
fuel pressure gauge? One easy thing to try is to loosen the locknut on the 
pressure regulator, twist the adjusting screw back and forth a few times (to 
break up the rust that's formed on those threads over the past 54 years, 
return the adjuster to its original position, and retighten the locknut.

That's a good temporary fix, but a hole makes it permanent. I'll try to 
remember to bring a pre-drilled regulator to the Invasion. Let me know if 
you'd like me to mail you one now. There's plenty of time to mail it to you.

I'll also have a fuel pressure gauge with me, as part of my usual Type 3 tool 
kit.


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