Question about 1987 Chevrolet S-10 Pickup

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I can not figure how to turn down the idle speed after replaceing the throttle body sensor. i tried reseting the ecu and still idles high

Cant figure how to adjust the idle back to normal after replacing the old sensor

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  • seanhonda90 May 24, 2009

    no it's the throttle body sensor that I replaced. not sure how to tune it down to specs, if I can tune it down at all

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ISC sensor?

Posted on May 24, 2009

  • frank thomas wilson
    frank thomas wilson May 25, 2009

    what kind of vehicle and engine size do you have again?

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There are several things that can cause high idle, but the 2 most common problems are as follows.

(1) You could have a vacuum leak somewhere on the engine. Here is how to check for that issue. Here's what I want you to do: Buy a can of CARB Cleaner and while the engine is running spray around the Intake Manifold, the manifold is the thing the throttle body sit on. Also spray around all the vacuum line as well. If while spraying there is a change in the idle speed then you have found your leak. If there is no change then move on to step 2.

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Figure 1: Fast Idle Control (FIC) Solenoid
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Throttle Body (TB) The throttle body (TB) controls the amount of air that flows into the engine through a single butterfly valve. The single butterfly valve opening is determined by the accelerator pedal. The TB is cast with an air bypass channel and houses several emission-related components for the powertrain control module (PCM).
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Throttle Position Sensor (TP Sensor) The throttle position (TP) sensor responds to the accelerator pedal movement. The TP sensor is a potentiometer that transforms the throttle plate opening angle into output voltage and sends the voltage signal to the powertrain control module (PCM). In addition, the sensor detects the opening and closing speed of the throttle plate and sends the voltage signal to the PCM. Also, the TP sensor is used to determine the air intake when the mass air flow (MAF) sensor fails. This mode of operation is called Fail Safe.
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