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VS Ecotec rough idle

nathanVY

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engine mounts can "look" ok, but you'd have to really compare it to a new mount to see. if they've never been replaced guaranteed the engine will be sitting lower. good way to check is to get a mate to put the car in drive and full brake and give it a bit of a rev (be careful obviously) with the bonnet open. see how much the engine lifts, if it lifts heaps then your mount is either snapped or sagged or old or all of the above lol.

think about it, when the car is going forwards (drive) the passenger side mount is under strain... that's 90% of the cars life.
 

primo

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yeah good point...............................I read about the mounts in another forum, so I'll check that out as well. The mechanic said that the mount bolts where tight so he didn't think they needed replacement, but if they have sagged, especially on one side, that could contribute to some vibration at idle I guess.
 

nathanVY

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yeah I reckon that's the go with mine, the engine lifts a fair bit. so I'm gonna replace mine and hopefully the vibrations end :)

Harmonica balancer could be the culprit as well. Could be showing its age and throwing things out a bit at low rpm.
How many kms on your car?
 

primo

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around 180,000.
 

primo

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wouldn't the balancer being making noticeable noises or movement in general?
 

nathanVY

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wouldn't the balancer being making noticeable noises or movement in general?

only if it's about to fall off lol. balancer will give you shudders and vibrations, usually decreasing with the increase of rpm.
if you start your car and take a look at how much the balancer wobbles about, i don't think they're meant to wobble at all.
 

FstStig

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If this was the case wouldn't the ECU be throwing a code because the CAS would be getting an incorrect signal?
 

The1

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nar the metal shroud the passes by the cas would be still fine, the rubber to the pully would be outta whack.
 

gendi

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my VS idled rough and vibrated really bad, got the engine mounts replaced (both where split in half) and wow i didnt know my car could be so quiet and not shake, also car ran like a bitch due to my break booster vacuum leak.
 
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