2003 Chevy Trailblazer Accelerator vibration

TR0103

MEMBER
2003 CHEVROLET TRAILBLAZER
6 CYL
4WD
AUTOMATIC
156,000 MILES

I have noticed after having the front differential replaced along with a front bearing that I have a vibration in the gas pedal. I notice this vibration while sitting in Park and pressing on the accelerator as well as when I put it in gear and accelerate. It is a constant vibration while pressing down on the pedal.

6 Replies

RACEFAN966

MECHANIC
5,029 POSTS

Ok lets start with the simple and go from there ok. Are all the plug wires on good and tight? Are the plugs all in tight none are loose? Is the check engine light on? Have you check the spark plugs to see if any are bad? Are the O2 sensors all pluged in? Get back to me and we will go from there.

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Wednesday, February 18th, 2009 AT 10:39 AM

TR0103

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The check engine light is not on. I checked several plugs and they appear good. The O2 sensor was just replaced about 6 months ago and the wires appear intact. I have noticed one additional thing. The vibration in the accelerator pedal is only when it is below 2000 rpm. At any point the rpm's are above 2000 and I press on the pedal the vibration is gone. Is there anything that could have been moved or affected when they put in the new front differential?

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Tuesday, February 24th, 2009 AT 11:02 PM

RACEFAN966

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5,029 POSTS

From what I can find no reason why the work done on the front diff should have caused any problems. Did you check to make sure no wires got pinched anywhere. If all looks good there maybe we can test the TPS if you have a digital multi meter. Let me know what you would like to do.

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Wednesday, February 25th, 2009 AT 11:04 AM

KIBADER

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My vibration started after I had a new radio and remote starter installed. Could something have happened during that installation to cause the vibration? I have a 2008 TB LT

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Saturday, February 11th, 2012 AT 8:16 PM

RIVERMIKERAT

MECHANIC
6,110 POSTS

Kibader, there is a chance that the installers knocked wires loose from a sensor. Does the rpm sound or feel like it's varying? If so, check for vacuum leaks, check and clean the EGR and IAC valves.