Sluggish acceleration

Tiny
RH309WV
  • MEMBER
  • 2000 GMC JIMMY
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 179,000 MILES
Car revs up in park but hardly wants to move when I try to drive it.
Saturday, March 30th, 2019 AT 9:12 AM

4 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This could be a problem with your throttle body bore needing to be cleaned. Over the course of time your throttle body will get gunked up with black "tar" like substance. This is a natural occurrence from moving a lot of air. The sludge will interfere with the Throttle Position Sensor (TPS) signal. Without a proper signal from the TPS the Power-train Control Module (PCM) AKA, "computer" will not know how much air is entering the engine. The vehicle will go into "limp" mode because your vehicle will not want to go lean and do engine damage. I have included a couple of links down below for you to go to.

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

Please go through these guides and get back to us with what you find out.

Thanks,
Alex
2CarPros

.

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Sunday, March 31st, 2019 AT 12:02 AM
Tiny
RH309WV
  • MEMBER
  • 6 POSTS
I cleaned out the throttle body and replaced the pcv valve and hose but still doing the same thing. Could it possibly be a clogged converter.
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Monday, April 22nd, 2019 AT 1:35 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

Did you clear the Direct Trouble Codes (DTC)(s) from the Power-train Control Module (PCM)?

Thanks,
Alex
2CarPros
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Monday, April 22nd, 2019 AT 7:16 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,347 POSTS
Yes it could be the catalytic converter causing the issue. here is a guide to help confirm the failure:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Please run down this guide and report back.
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Tuesday, April 23rd, 2019 AT 11:19 AM

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