Re: High RPM when hot

[DMCVegas@xxxx]

If your cold start valve was open all the time, it would flood the 
engine untill it dies. It almost sounds as though your idle speed 
regulator is on the blink. When my idle speed circuit was down, I 
rigged everything up where I could set the idle manualy. When cold, 
the engine would idle about 800-900 RPM's. With the valve in the same 
position with the engine hot, the idle would jump to 1600 RPM's. If 
your idle is up around 3000 RPM's, then your idle speed motor is full 
open. After purchasing a new idle speed motor and ECU, the trouble 
turned out to be a faulty wire (black/green in my case). Here is the 
best way I've found to check the idle speed circuit.

Using a voltmeter with the key in the "ON" position, check for 12 
volts from the hot wire, and verify that the ground connection for 
both the ECU, and the microswitch is good (12 volts from the hot wire 
directly to the grounds). Another way to test the microswitch is to 
put the key into the "ON" position, and trip the microswitch. When 
doing this, you should hear the vaccum solenoid under the intake 
manifold clicking.

For the wiring to the idle speed motor, try this. Insert a jumper 
wire between the hot wire and the wire you wish to test. In the 
engine compartment, connect the volt meter to the wire, and ground 
the connection to the engine block. Check for 12 volts on all 3 wires.

Other then that, the only other thing I can think of might be a poor 
connection/signal from the white/slate wire. But before this, try 
checking all other wires first.

I don't know exactly what you mean when you said your car "makes a 
lot of noise" when starting. Is the car having difficulty starting? 
Or is the just very high for those few seconds?

Try that and see how things turn out.

-Robert
vin 6585



--- In dmcnews@xxxx, debruin@xxxx wrote:
> I'm looking for some advise on a small problem I have. Ever since I 
> bought my D in june last year it always starts at about 3000RPM 
when 
> the engine is hot. When I start him in the morning, everything is 
> fine.
<SNIP>