RE: [T3] Temp Sensor I.. and running rich

["Jim Adney" <jadney@vwtype3.org>]

On 19 Sep 2000, at 10:13, Fuhriman, Mark wrote:

> Here's what I have checked so far to find why I am running rich:

> - Regulated voltage is around 13.8V or so (within the correct range)

This may be a little low. It really should be above 14 at med RPM 
with the engine warmed up. If it is really as low as 13.8 you are 
close to needing a new voltage regulator, but at this point it 
probably won't make a noticable difference in gas mileage.

> I figured the next things to check were the temp sensors and maybe
> compression (but I don't think that's my problem).  Then a detailed look for
> vacuum leaks I guess (unlit propane torch??  sounds scary). 

Vacuum leaks will affect the idle speed, but not the gas mileage.

> Is it possible that my rich condition is related to a high idle?  I have my
> idle adjustment screwed all the way in, but cold or hot idle is still around
> 950 rpm.  Bad throttle valve switch or auxilary air regulator maybe?  I'll
> test them. But can either of these cause poor gas mileage?

Either of these could cause an idle speed problem, but not a gas 
mileage problem.

> I get around 21 mpg.  A lot of windy roads and hills, but even on open
> freeways, I don't see better than about 22 mpg.  Car is a '69 Fastback.  All
> stock.  I've never seen any smoke coming out the tailpipe, but the inside of
> the tailpipe is black, and so is the chrome on my bumper right over the
> tailpipe.  Runs smoothly all the time, hot or cold.  Ideas?

Check the vacuum advance. Just suck on its hose while you watch 
your timing light. It should not leak and it should advance the 
timing; you should also hear a dramatic change in the idle speed.



-
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054

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