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Vz 3.6 alloytech rough idle

swift85

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My VZ Alloytech has a very rough idle,it is either idiling a bit low or there is some other problem.
I have just recently purcheased the car and on idle the car kind of trembles a little.Anyone with any ideas?
 

PaulSV6

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When was the last time it was serviced?
Spark plugs, dirty fuel injectors....
 

swift85

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It's got 110000k on clock service books are all stamped at regular intervals.
Next plug change is due at 120.000k.
Could it be a throttle body problem there is a bit of black residue around the flap area of TB?
 

andyman

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yeah clean the throttle up and see if it makes a differance, i doubt it would, but yes some get a bit of a vibration that you feel in the bottom of the car, like it make you jiggle in the seat,


ive fixed this by adding 20rpm at idle, smooths it out beautifully
 

f1tzy

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My ute got a massive lump on idle a while ago. Felt like it was running on 4 cylinders so i switched it off and then back on and it was gone. Hasn't been back and never logged any codes either
 

monaro327

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how rough are we talking what did you drive before the alloytec doesn't have the smoothest idle thats why it was bagged out on release compared to the ford i5 and aurion v6.
 

swift85

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The funny thing is when the air cond is on and working it seems to be better it idles a little higher and is smoother at idle.
When i say idle is rough i mean that if you are sitting at lights you can feel the car kind of rocking gently.
I've had V8 motors before with monster cams that shake rattle and roll but that's a different story.The idle RPM on my VZ would be approx 550 do0es that sound right. i would have thought idle should be around the 600-650RPM.
 

monaro327

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idle when warm should be 650rpm.
 

Troy711

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My ute got a massive lump on idle a while ago. Felt like it was running on 4 cylinders so i switched it off and then back on and it was gone. Hasn't been back and never logged any codes either
Mine used to do that when I hadn't started it for 3 or 4 days. A quick tap on the accelerator or restart it and the problem was gone.
 
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