[T3] Runs Great...but very hot... (2)

[Jim Adney]

On 17 Jun 2011 at 14:59, J. Jonik wrote:

> Just after I sent the message below, I casually checked my oil,
> expecting to have to top it up a little.  No.  It was up over the
> line...indicating that gas is (again) getting into the engine.   That,
> probably, accounts for Running Hot. 

You're checking the oil with the car on ~level ground, right?

Excessive richness makes an engine run cool, not hot. It's possible 
that you have a cooling system problem that IS making your engine run 
hot and the FI is trying to compensate by richening the mixture.

It might also be a good idea to attach a voltmeter to the fuse box 
(and ground) and leave it on the seat next to you. That way you can 
glance at the voltage occasionally while driving. Your voltage should 
be sitting around 14 V while cruising, but it will drop at low rpm 
and idle. If you see it droop below 13.5 while cruising, you have the 
standard VR problem, which is easily and cheaply fixed. (Low system 
voltage makes the FI run rich.)

>  Except for the novelty that the car runs great (otherwise), it's
> almost back to Page One. 

> Is it injectors? Should I just guess and get all new ones?...or start
> testing the spray and volume and all that?

They are probably fine, unless you have water or dirt in your system. 
Water causes rust, which is the same as dirt, plus it damages parts, 
like injectors. How is your overflow hose? Have you changed your fuel 
filter lately?

>  Is it that unconnected Temp Sensor at Air Dist?  

You're just fooling yourself by thinking you can fix an unknown 
problem by creating another problem somewhere else. The fact that 
disconnecting it helps IS interesting and potentially useful, but 
it's NOT a solution.  

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