Reduced engine power?

When the light is on, you need to have the computer scanned to identify where the problem is coming from. Most parts stores will do it for free.

Let me know what you find.
Joe

Hi,

Reduced engine power can be the result of a few different things. Engine temp, fuel issues, ignition issues, throttle actuator control system, and so on can all set that code. What you need to do is have the computer scanned for diagnostic trouble codes. That will point you in the direction of the problem.

I realize you replaced the throttle body, but the TAC involved more. Here is a list of components:

The TAC system components include the following:
- The accelerator pedal position (APP) sensors
- The throttle body assembly
- The throttle actuator control module
- The powertrain control module (PCM)

This is why it's important to scan the computer. In all honesty, all of the above items can be somewhat expensive, so we need to determine the root of the cause first.

Now, here is a quick video that shows how it's done.

https://youtu.be/YV3TRZwer8k

I realize most people don't own a scanner, but often times a auto parts store will scan it for free. Have that done. My only concern is this. If the reduced power indicator hasn't returned since the battery was disconnected, it may not show what we need. However, it should be done.

Let me know if this helps or if you have other questions. If you determine what codes are stored, let me know what they are and we'll work through it together.

Take care,
Joe

Hi,

That sounds like a plan. Honestly, I wouldn't want you to just replace parts that are good. Lets see if the codes show up and point us in the right directions.

Take care,
Joe

Hi,

Those codes all are associated with the throttle actuator control module (TAC). Now, there are a list of checks for these codes, but to start, I suggest simply checking the wiring to the TAC module. It is under the hood. I attached a pic of it. I highlighted the connector and circled the module. I want you to unplug it to confirm there is no damage to the connector and no corrosion causing a bad connection.

Before you unplug the module or plug it back in, make sure the battery is disconnected.

Do this and let me know what you find. Also, let me know if you are comfortable following diagnostic flow charts.

Take care,
Joe

That is both good and frustrating news simply because the lights are off now, but your uncertainty of the cause. I have to be honest, since it is working now, you moved something that caused a connection to improve.

I have to tell you that these vehicles have engine grounds which are known to corrode, break, and so on. So the idea that you moved the ground, I would start there. I have gone through vehicles like this that show continuity to ground as good, but as soon as a load is placed on the ground, it would fail. It's just a thought.

Let me know what you find or if you need any schematics or help.

Take care,
Joe

The throttle body is grounded through the ECM. After tracing through about 10 pages of schematics (LOL), the primary ground for the ECM is at the right front of the engine. See attached picture.

Joe

Both are behind the engine. I attached a pic so you can locate them. I indicated which is 103 and 104.

Let me know if this helps.

Joe

Good morning.

Okay, were there any codes set or is the check engine light on? That will give us a clue of the area of failure.

Roy

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://www.2carpros.com/articles/engine-has-low-power-output