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Jerry Lavender Posted on May 13, 2016
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Engine vibrates while idling and constant speed cruse. RPM fluctuates approximately 2 to 5 hundred RPMs. Vehicle is 2015 GMC Yukon Denali.

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Donald Ayers-Marsh

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  • GMC Master 1,389 Answers
  • Posted on May 13, 2016
Donald Ayers-Marsh
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Could be a lot of things - no way to diagnose from that single symptom.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

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Related Questions:

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1answer

I have a 2003 yukon denali i hear a clunking noise, it sounds like it is coming from left rear. i can fell it in the floor board under the the floorboard

This scenario could be something as simple as just the exhaust vibrating at a certain time or engine speed and vehicle speed not matching at a point and then the exhaust vibrates against the underside of the floorboard because it is so close to the floor.
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2006 GMC Yukon, 3/4 ton with tow package will not idle above 1200 rpms/10-15 mph

check ICS for correct operation
engine idle speed is 850 -950 rpms for auto and 750-850 for manual
at 1200 rpms you are not on the idle circuits but on power circuits
run the fault codes
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2004 GMC Yukon Denali

Check for trouble codes. You can get this done free at most car part stores.
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2answers

2004 GMC YUKON DENALI idling rough and trouble starting

unless you want to blow up the intake stop giving it gas before you turn it over what you are doing is dangerous all you are doing is dumping raw unburned gas into the bottom of the intake to the motor, one of these times you go to start it it will do this boom really loud then die, it will lift the whole back end of the vehicle off the ground, then if you try to start it again okay I edited the answer also could be your catalytic convertor plugged is the exhaust coming out good, change the sensors whatever you do stop pumping the gas if it wont start now get in as you need silence so shut the door and the radio off can you hear the fuel pump? it will sound like a huum for a few seconds if you cant there is your problem all I can say is stop pumping the gas as that's why its running bad you are burning out the sensors and all the computer code stuff and wasting expensive gas too. you prolly fouled your plugs as well.
0helpful
1answer

My 97 yukon runs at a higher rpm and has vibration and hesation in engine around 2000 rpm and uses almost three times the fuel does not do it all the time

It could be a couple of different issues going on, first I would check to make sure the engine does not have any type of vacuum leak. I check my vehicles with carb cleaner from Wal-mart, the cheap stuff. But be careful! It is very flammable, with the engine running at a idle, spray it in short bursts around the intake and vacuum lines, if there is a leak the engine will either idle up or down. Also, have the computer scanned at your local parts store and see what codes come back. When was the last time it had a complete tuneup? Hope this helps.
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I have a miss in my 2002 gmc yukon

Have the vehicle checked for code's . will show what cylinders are missing . Do drive it like that , check engine light flashing , will damage the catalytic converters
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