Re: VCT gutless, please help
Ok, just before the vacuum tree, there is (and I'm not 100% sure, because I'm looking at my ute in hope that it's similar) a rubber block with a few vacuum hoses coming out of each side. One of these is the feed for the VSV valve. This is the one which will go behind he washer bottle and needs to be disconnected while the engine is running to see whether it is holding vacuum.
I'll explain myself a little better on what the one way valves job is.
The VSV/BBM relies on engine vacuum to do it's job. When the throttle is floored at low revs, vacuum drops to almost zero. In this instance the vacuum actuater for the BBM would not be able to keep the butterflies in the long runner mode, so what is needed is a one way valve to hold vacuum at the actuater even though the engine is not actually making any vacuum.
My XH had this same problem when I first converted to BBM and the symptoms were on initial full throttle application it would accelerate great, then after about 1 second it would die and feel flat up until about 3500-4000rpm.
I only found out the problem on the dyno because I could see the actuater move about 1 second after the throttle was floored, even though it was at only 2500rpm or so, way before the 3800rpm BBM switchover.
If you are able to disconnect the correct vacuum line, just before the one way valve, you should be able to see the actuater move a second or so after you disconnect.
If the one way valve is functioning properly, it should hold vacuum for several minutes.
BTW, you can't simulate the actual problem (without disconnecting anything) whilst the car is stationary as the engine needs to be under load to simulate a no vacuum condition, such as driving or on a dyno.
4L I6, naturally aspirated producing 173.5rwkw.
14.410 @ 96.49mph with street radials.
What's that?..... Did I hear you say TQE power?
Last edited by Soxx; 01-10-04 at 04:39 PM.