[DMCForum] Re: Hot Start Fixed? (Vacuum Leak)

["content22207" <brobertson@xxxxxxxxxxxx>]

Idle speed motor can not cause a lean mixture (unless it's leaking air
from the outside world). Only unmetered air can cause a lean mixture
-- like a vacuum leak. The idle speed motor serves the same purpose as
(variably) cracking open the throttle plates. Follow the path of air:
over the air sensor plate, through the motor, into the engine.
Identical to throttle plates: over the air sensor plates, through the
throttle plates, into the engine. Also identical to the brass manifold
screws BTW: over the air sensor plate, through the air passages, into
the engine. Notice the common theme -- over the air sensor plate. Only
air bypassing the air sensor plate causes a lean mixture: leaking
manifold O rings, leaking U pipe gaskets, leaking vacuum hoses, etc.

PCV is the only exception.

Look at the pic of my BBQ'd spark plugs in #5939's DML photo album if
you want to see what a lean mixture looks like... (cracked vacuum line
to my HVAC mode switch did that).

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, Samuel <samuel_yahoo@xxxx> wrote:
> I have been tracing down a hot start issue and running issues on my car 
> for a year now. I stumbled across a few things that was giving me 
> trouble today, with help from Walter.
> 
> Figured out that my idle speed motor was stuck 1/2 way open. As a 
> result, I would be running fine at idle, but then hit the gas and would 
> run too lean, almost stalling the engine. There is question about my 
> oxygen sensor, although the readings appear fine. The other is that my 
> thermotime switch was bad. This would result in my cold start valve 
> running when the engine was warm. The end result was flooding the
engine.
> 
> Hopefully, I'll have the engine running without the hotstart, as a 
> result, I'll be able to drive and actually get other projects done on 
> the car, like getting my interior back in.
> 
> 
> Samuel
> #5096

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