Hi Guys. Having a few issues when starting the VS (Ecotec) 1. In the morning on a cold start the engine will fire and run but will drop its revs to the point of almost stalling for the first 5 or so seconds of running....after that its fine...is this normal? (bearing in mind its the middle of winter) 2. When the car has been sitting for 10 or more minutes and I start the engine I hear a light knocking/tapping noise....as soon as I start driving it dissapears but is always there when I start the engine....sounds like a lifter/valve problem or even the harmonic balancer but has anyone had the same symptoms...was thinking of going back to penrite full mineral + some lifter addative (running Castrol Edge Sport 25W50 at the moment) The car still runs like brand new and still goes hard...no noticable leaks. Thanks Guys
The knocking could be a worn harmonic balancer which has a slight wobble although it should be visible if you watch the HB when idling....or could be a lifter although that is more of a tap. For the drop in revs when cold possibly the ISC Idle Speed Control is a bit sticky and/or the throttle body is also suffering from a buildup of blowby deposits.....there is a "How-to" on cleaning them. If your car is high mileage - over 300,000km, then I'd run a thicker oil, although it is winter so maybe that wouldn't be a good idea!. Good Luck.
mine's wobbly and getting replaced soon, you can hear a slight knock every now and then, does it sound like the hb?
