G8 squeaking when DOD/AFM is activated

blakbearddelite

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I search the G8 forums and couldn't find anything on it.

When cruising, the G8 starts squealing until I give the car a little gas. Then it goes away. Anytime it starts squealing, just tapping the gas makes it go away. That is why I think it has to do with the AFM/DOD.

It seems like as soon as the AFM engages, the car starts squealing. I know the G8's are pretty well known to have lifter issues.

I'm going to create a thread over on G8board.com to see if anyone else has experienced this.

Oh, and sometimes when the car does a hard shift, it squeaks only for the duration of the shift.
 

blakbearddelite

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Or could it just be a bad belt and the squeak goes away then there is tension?
 

Mook

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FMS has closed.

Maybe have Speed take a look at it? [MENTION=3559]School Boy[/MENTION]
 

syP

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wow :rofl:

I read FMS as VMS, as in vectormotorsports... they do a shit ton of camaro and g8s.. yet i still typed FMS... brain fart
 

Bru

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Does it make the noise when hot, cold, all the time?
 

blakbearddelite

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It makes the noise only when cruising with enough throttle to maintain speed. As soon as I give the accelerator just a slight tap, the noise goes away. Then a few seconds later it will start up again.
 

syP

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check your balancer (crank pulley)... g8s are known for it to wobble like crazy.. when it gets bad enough it squeaks. blipping the throttle is enough to make it go away.
 

Ti28

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Could be a lifter issue. Who knows; really hard to tell online.

Check all your belts and pulleys.

Seems really weird it only does it when AFM is on.
 

School Boy

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If you are interested we can take a look at it for you. PM me if you would like.
 

SinisterSHO

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Go into engineering mode and it will tell you when AFM is on, see if it coincides with the noise.
 

blakbearddelite

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Go into engineering mode and it will tell you when AFM is on, see if it coincides with the noise.
Thanks! Confirmed with engineering mode, the squeaks only happen when AFM is on. I put it in manual mode (which locks out AFM) and there was no squeak. But in normal mode, it squeaks like crazy when the AFM is engaged.
 

10sec

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*3800 advice* They do have a volume knob for a reason *3800 advice*
 

bikrboy128

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does the belt tensioner have good tension? maybe the extra engine vibration from AFM is making the tensioner bounce, causing belt noise.
 

blakbearddelite

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does the belt tensioner have good tension? maybe the extra engine vibration from AFM is making the tensioner bounce, causing belt noise.
I'll check that out this evening. Though I'm not sure how to gauge whether or not there is 'good' tension.
 

blakbearddelite

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My alternator took a dump on me over the weekend. I had it replaced and now the squeak is gone.
As far as i know, the belt wasn't changed.
Would that mean the alternator was the source of the squeak or that the mechanic adjusted the tensioner and that fixed the squeak?
 

boostedguy05

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could have been either. i dont see a shop adjusting a tensioner without charging you.
 

blakbearddelite

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Ah, I didn't realize that was something that would take enough time to charge a customer. I thought it was just a simple turn of a nut or something.
 

bikrboy128

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it's an automatic tensioner, so adjustment isnt possible. was this done under warranty?
i've dealt with some really weird shit with these engines with cylinder deactivation, so a bad alternator being the cause isnt all that surprising. :rofl:
 

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