Tahoe 2009 - Rough Idle when AC turns on.
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CF Beginner
Joined: Jan 2021
Posts: 3
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From: Saudi Arabia
Tahoe 2009 - Rough Idle when AC turns on.
Hi All
I have Tahoe 2009 LT 2WD. My truck has 281,000 miles on it. I purchased this truck 5 months ago.
Since 2 months I am trying to figure out the rough idle on it while AC is on only & rpm goes up and down from 500-700 with vibration(when vehicle slows down) from cabin or under the hood not sure. (it stop fluctuating when I turn off the ac)
I also noticed the vibration like buzzing sound at 68 mph----(110 km/h).
Someone just frightened me yesterday that this is due to weak engine & that's the reason before going to mechanic I wanna ask your opinion.
I also changed my spark plugs 2 months ago.
Regards
I have Tahoe 2009 LT 2WD. My truck has 281,000 miles on it. I purchased this truck 5 months ago.
Since 2 months I am trying to figure out the rough idle on it while AC is on only & rpm goes up and down from 500-700 with vibration(when vehicle slows down) from cabin or under the hood not sure. (it stop fluctuating when I turn off the ac)
I also noticed the vibration like buzzing sound at 68 mph----(110 km/h).
Someone just frightened me yesterday that this is due to weak engine & that's the reason before going to mechanic I wanna ask your opinion.
I also changed my spark plugs 2 months ago.
Regards
CF Monarch
Joined: Oct 2017
Posts: 4,605
Likes: 268
From: USA
Hi All
I have Tahoe 2009 LT 2WD. My truck has 281,000 miles on it. I purchased this truck 5 months ago.
Since 2 months I am trying to figure out the rough idle on it while AC is on only & rpm goes up and down from 500-700 with vibration(when vehicle slows down) from cabin or under the hood not sure. (it stop fluctuating when I turn off the ac)
I also noticed the vibration like buzzing sound at 68 mph----(110 km/h).
Someone just frightened me yesterday that this is due to weak engine & that's the reason before going to mechanic I wanna ask your opinion.
I also changed my spark plugs 2 months ago.
Regards
I have Tahoe 2009 LT 2WD. My truck has 281,000 miles on it. I purchased this truck 5 months ago.
Since 2 months I am trying to figure out the rough idle on it while AC is on only & rpm goes up and down from 500-700 with vibration(when vehicle slows down) from cabin or under the hood not sure. (it stop fluctuating when I turn off the ac)
I also noticed the vibration like buzzing sound at 68 mph----(110 km/h).
Someone just frightened me yesterday that this is due to weak engine & that's the reason before going to mechanic I wanna ask your opinion.
I also changed my spark plugs 2 months ago.
Regards
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Rayola88
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Aug 14, 2017 7:30 AM