re: Hot Starts

[Joe Elliott <jee@domain.elided>]

My car has a problem similar to the one described in the original 
post, at least in cold weather, but the numbers are a little 
different.  It'll start fine after sitting overnight, and it'll start 
fine if shut off in the last hour or so, but if it sits for 1-5 hours 
it cranks for a while before it starts.  Anyway, I've never bothered 
to resolve it.  Re: Tom's post, I don't think it's the TTS or the 
AAV.  If the original poster lives in a temperate climate in the 
Northern hemisphere, his cold start injector isn't coming into play 
at all.  I suppose maybe the CSI is firing when its not supposed to 
and flooding the engine (due to a faulty TTS), but I kind of doubt 
it.  (That theory does work though--after so many attempts to start 
the TTS would stay open having used up its 9 seconds or whatever, 
after a few more attempts the engine would no longer be flooded.)  As 
for the AAV, it won't affect the mixture since the additional air it 
lets into the engine goes through the airflow meter.  A faulty AAV 
will screw up your idle speed, not mixture.  Of course, my experience 
is with an '82 V6--later cars with the 3-position throttle position 
switch might get leaned out by a bad AAV, but I kinda doubt it. 
Anyway, if you figure it out, let me know as it might help my car 
behave better in the winter.  Oh, BTW, I totally agree that it's not 
a fuel pressure problem; if you're going to have a residual fuel 
pressure problem it will certainly be apparent when starting cold 
after the car has been sitting.

At 1:27 PM -0400 9/5/1, alfa-digest wrote:
>Date: Wed, 5 Sep 2001 09:26:17 -0400
>From: "Evans, Tom" <tevans@domain.elided>
>Subject: Re: Hot Starts
>
>Since the car starts when cold and runs perfectly, and since many
>fuel-supply system parts have been replaced, I would look beyond a fuel
>pressure or injector problem.
>
>Perhaps the problem lies withing the Bosch control system.  Maybe the
>thermo-time switch is not resetting itself soon enough to allow a restart
>after 10-60 minutes.  The problem could also be compounded by a sticking
>Auxiliary Air Valve.  If this valve sticks open while slightly warm, the air
>mixture will be too lean.
>
>You could try replacing the thermo-time switch.  I don't think they are too
>expensive.  Before replacing the AAV (they are expensive), try taking it off
>the car and rotating the plates inside with a probe or screwdriver with some
>WD-40.  That should free up the spring, if it is sticking.
>
>- -Tom
>'86 Spider

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