1g dsm data logger software how to#

If there is too much slack at idle, you won't get 100% throttle opening at WOT. With all of these things working properly, set correctly, and in good balance, idle speed control is generally very good on these things.ДЄn incorrect throttle cable setting causes a lot of issues that are easily avoided. In order for the ECU to attempt closed loop idle control, the Idle Switch must be made. And the FIAV is a coolant temperature based air bypass that raises idle speed and provides enough air bypass to keep the engine running when cold. The ECU will also use Ignition Timing for fine/quick control of idle speed. The throttle plate and BISS air bypass must be set so that the ISC has good range of travel in the open and closed directions in order to control idle speed adequately in all conditions. The throttle plate position and BISS position combined determine how much air is always bypassed around the throttle plate, and the ECU controls the ISC to do the rest and provide an adjustable air bypass to keep idle speed on target (closed loop). The BISS is an adjustable screw that provides additional air bypass around the throttle. The throttle plate setting determines how much air is bypassed around the throttle itself. It will use the ISC to provide closed loop control of air bypass around the throttle to raise and lower idle speed to reach that target. The ECU will have a target idle speed at which it will try to run. The throttle cable when set correctly will not influence idle speed.

Some are fixed, some are adjustable, some are under ECU control, some are unintended. There are a number of air bypasses around the throttle plate. If the throttle were completely closed, the engine would not run, of course.

Idle speed is achieved by letting some air bypass the closed throttle plate. This might get long, but hopefully it helps. While this is meant for DSMs in the US, I'm sure it carries over to many other models, even if just in principle of operation.

1g dsm data logger software how to#

I'm going to go through each component, what it does, how it can fail, and how to set it up initially and then dial it in. There are a number of different components, and knowing what they all do and how they work together is key to understanding how to set it all up, or troubleshoot problems effectively. Idle control on these cars is perplexing to a lot of people, and for good reason.