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VT V6 , VERY rough noisy idle, won't run/rev

sticksicks

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Hi All. Great site here!
I've searched for info on my problem here and not found much useful, hence this post:
I've a Series 1 VT V6, 300K kms, auto, well maintained and serviced. Driven spiritedly :)
The other day a twat ran me off the freeway into the middle stop lane. I had to floor it to get back to the speed limit on a blind 100kmh corner.
Engine may have revved to/over 4,000 breifly, oil is not low.
After this it drove fine and stopped and started as normal.
Later in the day it stopped driving fine and idles very very badly and won't rev. There is a 'tinking' noise in the top of the motor.
I've recently done the Crank Angle Sensor and the coils and fuel systems, plugs and leads are tested and fine.
I did drive a few weeks with a dodgey spark lead on Number 4........:(
My mechanic has tested the compression on all cylinders and all are good except Number 4, which has ZERO compression.
Before I call the wrecker, is there anything simple I've missed, or is it likely as fecked as it sounds?
 

commodore665

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The lead and plug on cylinder 4 might be knackered , or the injector on 4 is cactus too
 

Tree cutter

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Might be a broken valve spring. Take the rocker cover off and have a look
 

sticksicks

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Thanks.
And when it does 'run/idle/cough/fart/snort' it doesn't blow any black smoke like it would with a fecked DFI module or faulty MAF.
 

sticksicks

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A mechanic did pull off the harmonic balancer very recently, to replace the CAS behind it.
Is there anything that could have been damaged by this, that would lead to say, slippage in the timing chain systems down the track.
Seriously, it runs like a slipped chain has put out all the timing.....in which case my motor is well and truly screwed.....but then, so is the mechanic :/
 

gohrdrgomad

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Hi All. Great site here!
I've searched for info on my problem here and not found much useful, hence this post:
I've a Series 1 VT V6, 300K kms, auto, well maintained and serviced. Driven spiritedly :)
The other day a twat ran me off the freeway into the middle stop lane. I had to floor it to get back to the speed limit on a blind 100kmh corner.
Engine may have revved to/over 4,000 breifly, oil is not low.
After this it drove fine and stopped and started as normal.
Later in the day it stopped driving fine and idles very very badly and won't rev. There is a 'tinking' noise in the top of the motor.
I've recently done the Crank Angle Sensor and the coils and fuel systems, plugs and leads are tested and fine.
I did drive a few weeks with a dodgey spark lead on Number 4........:(
My mechanic has tested the compression on all cylinders and all are good except Number 4, which has ZERO compression.
Before I call the wrecker, is there anything simple I've missed, or is it likely as fecked as it sounds?
lt certainly could not drive fine on 5 cylinders.
 

sticksicks

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"Might be a broken valve spring. Take the rocker cover off and have a look"
Great suggestion. Done. 1 x broken valve spring and damaged retainer and 2 x collets found !
Pics to follow....
 
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