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Intermittent acceleration problem

Tiny
DANIYALKZA
  • MEMBER
  • 2007 HYUNDAI TIBURON
  • 2.7L
  • V6
  • 2WD
  • MANUAL
  • 75,000 MILES
Hi. My throttle feels heavy like something pulling my car back from accelerating but it is an intermittent problem and when I restart engine disappear for a while but comes again. There is not even a pending code stored in my ECU. I have changed my upstream o2 sensors but nothing changed. Checked everything before change o2 sensors. Include:
MAF
TPS
Fuel filter
Sspark plugs
Spark plug wires
Coil pack
Catalytic converter
Engine coolant temperature sensor
Intake air temperature sensor
Fuel injectors
I have no problem with cold start or reach high speeds. Idle is fine. It's make me crazy for about six months.
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Wednesday, July 3rd, 2019 AT 8:20 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Hello,

I would service the throttle bore start by disconnecting the battery. Here is a guide to help get the work done:

https://www.2carpros.com/articles/throttle-actuator-service

Please run down this guide and report back.
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Thursday, July 4th, 2019 AT 3:16 PM
Tiny
DANIYALKZA
  • MEMBER
  • 111 POSTS
Thank you. Throttle bore is clean. I think it's electrical problem.
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Thursday, July 4th, 2019 AT 3:43 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Can you please shoot a quick video with your phone so we can see what's going on? That would be great. You can upload it here with your response.
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Friday, July 5th, 2019 AT 10:49 AM
Tiny
DANIYALKZA
  • MEMBER
  • 111 POSTS
Okay, I will do it soon.
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Friday, July 5th, 2019 AT 12:14 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Also lets check the catalytic converter. here is a guide:

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

Please run down this guide and report back.
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Friday, July 5th, 2019 AT 1:04 PM
Tiny
DANIYALKZA
  • MEMBER
  • 111 POSTS
Thank you. I have removed my catalytic converters two years ago.
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Saturday, July 6th, 2019 AT 1:44 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
It sounds like you are setting the computer each time the malfunctions start, this can be a sign the PCM is bad and needs replacement. Here are instructions and diagrams to help. Check out the diagrams (below). Please let us know what happens.
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Sunday, July 7th, 2019 AT 1:16 PM

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