Re: [T3] Rough or no idle when cold

["Mark Fuhriman" <mfuhriman1@hotmail.com>]

<x-flowed>>OK, here's what I have come up with. I checked all the ignition parts, 
> everything
> was good. Checked the head temp sensor (used Jim's last post about ohms for
> reference) it was fine, did the jumping the wires thing, and nothing seems 
> to
> work............

By that, I assume that when you jumped the wires across the fuel pump relay, 
the pump hummed for you.  But this still didn't solve your problem.  Is that 
right??

> However, if I hold the pedal WOT (wide open throttle) while trying to start 
> the
> engine it turns over for quite awhile before firing, but when it does 
> everything is
> fine. Smooth idle, no sputtering, etc.

I forget what year you're talking here.  But regardless of year, this is a 
good way to help start a flooded engine.  I don't recall exactly the context 
of your earlier questions, but what you describe above points to an 
excessively rich condition that seems most severe when cold.  How is your 
fuel economy when it's up and running?

As Jim says, Measure the system voltage when warmed up and the engine 
slightly revved.  Should be above 14V.  If not, the voltage regulator under 
the rear seat is going or gone.

Do you have a cold start injector?  If so, disconnect it and see if that 
helps.

If you have a 68 or 69 and are running the "A" brain, you should try a "B" 
brain.  The letter is the suffix of the VW part number stamped on the box.

You say your head temp sensor tests out fine, so..

Try to find out why you are running rich.

-Mark Fuhriman


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