Erratic idle

Hello,

This sounds to me like you have a intake leak problem. You might want to check the intake manifold bolts torque and the gasket again. In the diagrams down below I have included the torque values for the intake manifold bolts. Please follow these torque values and do not over tighten. If you over tighten, you can smash the gasket out, causing an intake leak.

Thanks,
Alex
2CarPros

Welcome to 2CarPros.

Since you replaced the throttle body, the vehicle has to relearn the idle air volume needed for a smooth idle. I will provide directions for this. There are two ways to do it. One requires a upper level scan tool and the other can be done without. I will provide the directions for without the scan tool. The two attached pictures correlate with the directions.

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Without CONSULT-II

NOTE:
- It is better to count the time accurately with a clock.
- It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has a malfunction.

1. Perform EC-93, "Accelerator Pedal Released Position Learning". See: Accelerator Pedal Position Sensor > Programming and Relearning > Accelerator Pedal Released Position Learning
2. Perform EC-93, "Throttle Valve Closed Position Learning". See: Computers and Control Systems > Programming and Relearning > Throttle Valve Closed Position Learning
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
7. Repeat the following procedure quickly five times within 5 seconds.
A. Fully depress the accelerator pedal.
B. Fully release the accelerator pedal.

8. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops blinking and turned ON.
9. Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
10. Start engine and let it idle.

Pic 1

11. Wait 20 seconds.

Pic 2

12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications.
13. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried out successfully. In this case, find the cause of the incident by referring to the Diagnostic Procedure below.

DIAGNOSTIC PROCEDURE
If idle air volume learning cannot be performed successfully, proceed as follows:
1. Check that throttle valve is fully closed.
2. Check PCV valve operation.
3. Check that downstream of throttle valve is free from air leakage.
4. When the above three items check out OK, engine component parts and their installation condition are questionable. Check and eliminate the cause of the incident.
It is useful to perform EC-148, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE". See: Computers and Control Systems > Monitors, Trips, Drive Cycles and Readiness Codes > Specification (SP) Value

5. If any of the following conditions occur after the engine has started, eliminate the cause of the incident and perform Idle air volume learning all over again:
- Engine stalls.
- Erroneous idle.

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Let me know if this helps or if you have other questions.

Take care,
Joe