Vehicle does not accelerate when depressed throttle pedal

Tiny
MALLYBOY
  • MEMBER
  • 2005 MAZDA TRIBUTE
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 56,478 MILES
This vehicle does not raise or hesitate before it raise, I have diagnosed it after certain distance drive but it is not record any fault code. I have used live data to view of a particular sensor is out operating threshold but could not see except Absolute Throttle Position that reads:20%, (I attached the picture below). At this point I am confused what could be problem, any suggestions would be appreciated.
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Thursday, September 23rd, 2021 AT 10:43 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi,

I have a couple of questions. First, I noticed no voltage signal on two of the oxygen sensors and very little response on the others. Was this test done when the engine was at operating temperature?

Next, absolute throttle position, is that a reference to the manifold absolute pressure sensor or the throttle position sensor?

Is it possible for you to provide the short-term fuel trims for me?

Let me know.

Joe
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Thursday, September 23rd, 2021 AT 5:39 PM
Tiny
MALLYBOY
  • MEMBER
  • 334 POSTS
Was this test done when the engine was at operating temp? Yes the engine has reached operating temperature.

Next, absolute throttle position, is that a reference to the manifold absolute pressure sensor or the throttle position sensor? It's for reference to throttle position sensor.

Is it possible for you to provide the short-term fuel trims for me? Yes I will provide the live data stream of all sensor pids.
Thanks
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Thursday, September 23rd, 2021 AT 10:19 PM
Tiny
MALLYBOY
  • MEMBER
  • 334 POSTS
Hello! Good evening, Is it possible for you to provide the short-term fuel trims for me? Yeah I have provide it, look at the picture below.
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Friday, September 24th, 2021 AT 1:13 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
The short-term fuel trims are good. You want them to be between positive 10% and negative 10%.

If you are seeing 20% for the TPS at idle, something is wrong. At an idle, it should be around 0% to 2 or 3%.

Have you removed the connector at the TPS to inspect for damage or corrosion?

Let me know.

Joe
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Friday, September 24th, 2021 AT 6:41 PM
Tiny
MALLYBOY
  • MEMBER
  • 334 POSTS
Have you removed the connector at the TPS to inspect for damage or corrosion? No I have not done that. I will do it and get back to you.

Another thing is when I depress the throttle pedal, I hear a hissing sound within the rear side of intake manifold, when this happens, it fails to accelerate, can I use MAP sensor reading to identify if there's an unmetered air from external source entering the engine?
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Friday, September 24th, 2021 AT 10:39 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi,

If you hear a hissing, chances are there is a vacuum leak. Here is a link you may find helpful in locating one:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

If it is loud enough to record, do so and upload it for me to hear.

Let me know what you find.

Joe
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Saturday, September 25th, 2021 AT 7:29 PM

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