i just bought my 08 G6 2.4L with 122990 KM and it has a slight knocking noise while its idling. it seems to go away when i accelerate but i dont know what it is. at first i thought maybe the gas because Gm calls for 91 octane and i had 87 inthere but then i put some 94 in there and its still knocking. it sounds like a very low volume helocopter lol.
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Light engine knocking at idle
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Re: Light engine knocking at idle
I'm pretty sure that 4 cylinder runs on 87 octane... Where does it call for 91 octane? The only one that would need that (maybe) is the 3.6L2006 Pontiac G6 GT
Appearance Mods: AIT front bumper, Black Eagle Eye Halo Projectors with DDM Tuning 5000k HIDs 35w,
GT door decals, painted interior trim, red calipers, de-chromed window trim
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Re: Light engine knocking at idle
The G6 2.4L calls for 87 regular. No G6 trim calls for 91-93 octane
Only the 2.4L G5, Colbalt SS (non supercharged) calls for 91-93 octance but they are also like 10 more HP.
Knocking is strange. I belive you are hearing something that sounds like knocking but isnt, if that makes sense. The new engines with the knock sensors will hear a knock well before any person can. And if the sensor is malfunctioning a check engine light will come on.
Without more info, I would maybe think at that milage you are hearing the valves. Might have a bit of valve tapping going on, that could sound like a minor knock and will go away under load.2006 G6 GTP: Traded
2013 Mustang GT
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420 HP 5.0L
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Re: Light engine knocking at idle
Get that car to your GM dealer, engine its covered under powertrain warranty. Be prepared to present envidence of oil changes.
An audio file will help a little here, but these engines are quite loud at idle.
The knocking sound dull or its has some sort of high tone to it?
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Re: Light engine knocking at idle
Its hard to say, its sounds low but seems to be getting worse. As for the proof of oil changes, I don't have any as I just got the car last friday. Its going in to the dealer tomorrow morning and if its serious and not covered I'm goin back to where I bought it and having somethin done there. I know there is a 30 day consumers warranty regardless of what you buy.
Also there is a squeeking noise comming from the rear whenever I hit bumps and its getting anoying. I wonder if the seals are dry....hmmm..<<<<<BROTHERNEWF>>>>>
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