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My VT V6 runs fine except at idle it 'wobbles'
Its almost like it's missing but I have checked everything including the EGR vavle, plugs leads and coil packs. I even had a friend put it on the computer at a Holden dealer and can't find anything.
One of their top techies reckons it could be carbon build up on the backs of the valves, anyone else ever heard of that?
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I would be checking for air leaks. The most common one is the purge hose, it comes away from near the throttle body.
It won't show up on a scanner because it's not an electronic fault as such.
I've owned plenty of Ecotec V6 Commodores & still have 4 in the fleet with high kms, & have never had an issue with carbon build up on the back of valves.
Dr Terry |
If at first you don't succeed, just call it Version 1.0 |
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Thanks for that - it sounds pretty plausable - thats why I checked the EGR. I was told they sometimes stick open or closed. Is there any easy way to look for air leaks???
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Observation first, for the obvious ones like a hose that's come off.
After that I use the spray method - get a trigger bottle with water in it, and squirt it at every connection. A vacuum leak will suck the water into the motor, but in the process you'll hear the idle speed change.
I used to use a can of carby cleaner & a nozzle to do this, until I overshot near the dizzy one day, and next thing I had a fireball. Water is much safer...... and in small volumes, it won't hurt the motor. |
Cheers,
Mick
_______________________________________________________________
Judge a successful man not on how he treats his peers, but on how he treats those less fortunate. |
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Rank: Member
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Just for info - I took off the top of the plenum chamber and the throttle body - they were really really grungy. I cleaned both with cleaner and a wire brush (while keeping a vacuum cleaner sucking the debris away, it worked quite well). I put a small dribble of brake fluid down the intakes, I have been told this works like a decoking agent. We used to do it a lot in the uk on crappy 4 cyl engines which seemed to suffer a lot from carbon build up in the days of badly tuned carbys.
Then I refitted it all with a smear of sealant. After much chuffing of smoke it cleared up and ran better. It is not perfect but it is running much better. I'm not sure which had the most effect though !!!!
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