AW: [DML] Re: Idle Speed Motor / Cooling
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AW: [DML] Re: Idle Speed Motor / Cooling



The engine would only stall when you pull the connector if 
the idle motor is closed in that moment. It could also be wide 
open so that idle would shoot up to >2000rpm, or somewhere in 
between so that it seem to idle ok.

The idle motor is a valve that is driven by a PWM with 100Hz.

The main difference between unplugged or not is that the
control circuit is disabled and the constant airflow will 
smooth out the idle speed (remember the carburators ?).

VB - is the behaviour always the same ? How often did you test it ?
once ? twice ? ten times ?
What is a good idle for you ? 775rpm ?
The main problem here is the observation of the different symptoms.
Did you test the motor like I asked you to do ?
+12V to the center spade, then Ground to the left spade, right spade, 
left spade...
The motor should open and close completely each time Ground is 
changed to the other spade. If this works the motor should be ok.
If it is the connector - fix it.
If it is the idle ECU - hey, you live in Texas, you can ask at least 
two different vendors to send you another ECU to test it - luxury
that the rest of the delorean-world only can dream of.

Last time I checked the idle of a car in Texas there was the plug for the
mixture adjustment screw missing. David is right when he asks you to check 
the mechanical stuff - linkage, switch, brass screws...

Also - if the switch is not being activated when pushed (not pushed far 
enough or simply broken) - the idle is set to >1000rpm ! No, the ECU is
NOT turned off !

Also - A/C on - temperature goes up ?
How fast ? within a second or within several minutes ?
If it is within seconds it must be a wrong measurement due to electrical
problems. The engine's temperature can't jump !
Why should the temperature go up when the fans turn on ? The only way
this could happen is when the air in Texas is hotter than the engine !
Therefore I bet it is an electrical issue. Did you check the Ground 
connections ? Do you know where they are ?

Elvis & 6548


If the motor still runs when you unplug the idle motor you have vacuum
leaks or your throttle linkage is not adjusted correctly or both. The
motor should stall when you pull the plug on the idle motor. Check
that the brass screws are closed. Check the throttle plate adjustments
that the throttle plates are closed all the way.
David Teitelbaum
vin 10757





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