Throttle position reset

Tiny
RGETTLER
  • MEMBER
  • 2010 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 182,000 MILES
I cleaned the the throttle body due to a P2135 code. After cleaning and reinstalling, the P2135 code is gone, but now it idles at 3,000 rpm. Efforts to reset the TPS have not worked. I have let the engine idle for three minutes, sat for one minute, then ran another three minutes. It still idles at 3,000 rpm. What could be the issue?
Saturday, February 2nd, 2019 AT 10:04 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon,

Are you sure the throttle plate is closing all the way?

Remove the inlet hose to the throttle body and move the plate by hand and be sure it is smooth and closes all the way.

https://www.2carpros.com/articles/how-a-throttle-body-works

Roy
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Saturday, February 2nd, 2019 AT 2:24 PM
Tiny
RGETTLER
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It’s closed.

I do have a K&N cold air intake on it if that helps.
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Sunday, February 3rd, 2019 AT 6:28 AM
Tiny
ASEMASTER6371
  • MECHANIC
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That is always a problem.

K/N air filters contain oil and contaminate the sensors causing issues.

Dealers will suspend all warranties if a car is presented with this filter installed. That is how bad it is.

Do you have a scan tool to monitor the throttle plate percentage?

Roy
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Monday, February 4th, 2019 AT 3:57 AM
Tiny
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Yes. It’s consistently at 32-33% even at 3000 rpm idle. The cold air intake has been on the truck for over 150,000 miles.
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Monday, February 4th, 2019 AT 4:52 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Then you need to start back at the TPS and be sure it is set correctly.

It should be.5 to.75 at idle and at 4.8 volts at wide open throttle.

Roy
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Monday, February 4th, 2019 AT 4:57 AM
Tiny
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Okay, I’ll check that.

Here’s what it typically does: I start It cold, it idles fine around 700-800 rpm's. I tap the gas to see if it’ll come back down and it spikes To 3,000 rpm. I have a brand new throttle body with sensor that I installed to try to eliminate the TPS all together, it does the exact same thing. High rev at idle, throws the P0507 code. I’ve reset the ECM to try to fix the issue. I’m at a loss.
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Monday, February 4th, 2019 AT 5:17 AM
Tiny
ASEMASTER6371
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  • 52,796 POSTS
Okay, got it.

Resetting does nothing.

I attached a flow chart for you to view.

Did you use a new throttle body or used?

Roy

P0507
* Vacuum leaks
* A throttle valve that does not close correctly
* Verify the correct operation of the crankcase ventilation system. Inspect for the following conditions:

- The routing of the positive crankcase ventilation (PCV) system
- Vacuum leaks in the PCV system-Refer to Crankcase Ventilation System Inspection/Diagnosis (See: Positive Crankcase Ventilation > Component Tests and General Diagnostics > Crankcase Ventilation System Inspection/Diagnosis)

If a condition is found, repair as necessary.

Repair Instructions

Perform the Diagnostic Repair Verification (See: A L L Diagnostic Trouble Codes ( DTC ) Verification Tests Diagnostic Repair Verification) after completing the diagnostic procedure.
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+1
Monday, February 4th, 2019 AT 5:28 AM
Tiny
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I tried a brand new OEM throttle body and got the same results. Put the old one back on since nothing changed.
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Monday, February 4th, 2019 AT 5:33 AM
Tiny
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Okay, you need a scan tool to monitor the voltage with the throttle closed and open.

Roy
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Monday, February 4th, 2019 AT 5:40 AM

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