Acceleration issue

Tiny
BOOGIEMAN314
  • MEMBER
  • 2009 CHEVROLET IMPALA
  • 3.6L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I got on the highway and accelerated with no problem. 10 seconds later I could feel myself slowing down. I pulled over and my car was quiet. I tried to drive off with no acceleration. My RPM's didn't budge until my pedal hit the floor. It changes gears with no problem. So I put it in park and tried to rev it up. My RPM's didn't budge until my pedal hit the floor. It only got up to about 3-4. What could be my issue?
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Friday, September 20th, 2019 AT 5:46 AM

4 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

Did the check engine light stay on with the engine running? If it did, the first thing you need to do is check for diagnostic trouble codes. Most parts stores will do it for free, but since the vehicle is not safe to drive, see if they will lend or rent one to you.

Here is a quick video showing how one is used:

https://youtu.be/YV3TRZwer8k

The first thing I would check is the throttle position sensor. Here are the directions for removal and replacement. I'm adding them to help you inspect it. Make sure the connector isn't damaged or loose. The attached pictures correlate with the directions.

______________________________

2004 Chevrolet Impala V6-3.4L VIN E
Procedures
Vehicle Powertrain Management Fuel Delivery and Air Induction Sensors and Switches - Fuel Delivery and Air Induction Throttle Position Sensor Service and Repair Procedures
PROCEDURES
THROTTLE POSITION (TP) SENSOR REPLACEMENT

REMOVAL PROCEDURE

pic 1

1. Disconnect the fuel lines.
2. Disconnect the throttle position (TP) sensor electrical connector.

pic 2

3. Remove the TP sensor screws.

pic 3

4. Remove the TP sensor and the O-ring.

INSTALLATION PROCEDURE

pic 4

1. Install the TP sensor O-ring to the TP sensor.

pic 5

2. Install the TP sensor.

pic 6

3. Apply thread-locking compound LOCTITE(R) 262, GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the TP sensor screws.

NOTE: Refer to Fastener Notice in Service Precautions.

4. Install the TP sensor screws.

Tighten
Tighten the screws to 2.0 N.m (18 lb in).

pic 7

5. Connect the TP sensor electrical connector.
6. Connect the fuel lines.

_________________________

Let me know about the diagnostic trouble codes and if this helps.

Take care,
Joe
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Friday, September 20th, 2019 AT 7:12 PM
Tiny
BOOGIEMAN314
  • MEMBER
It was my acceleration position sensor. The check engine light never came on which is what baffled me. The sensor was actually burned at the ends. I replace the pedal and sensor and it was fine. Apparently that's a huge common problems with Impala's and Malibu's
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Monday, September 23rd, 2019 AT 9:50 AM
Tiny
BOOGIEMAN314
  • MEMBER
Thanks for replying also. I also first thought it was my throttle body.
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Monday, September 23rd, 2019 AT 9:51 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome back:

I;m glad you got it taken care of and you are very welcome. I have to be honest, there are just too many sensors anymore. Lol

Let us know if you have questions in the future.

Take care,
Joe
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Monday, September 23rd, 2019 AT 8:03 PM

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