Hi guys, I'm new to this forum and just got my vl on the road after a 3 year build! At the moment it just a internally stock 3ltr n/a 4 speed auto other than a 2.5" catback. Im currently having some issues with writher the motor or transmission. Its a bit hard to explain what happens but just briefly, sometimes the car goes insane and kicks down right and everything is perfect but other times its very sluggish and will not kick down. I may sound like a fool but its like the car has 2 complete different personalities! I have so far found that the modulator valve is not working properly and im hoping that is the issue with the kick down but one of my other main concerns is that timing seems to be getting retarded for reasons such as; i can full advance my dizzy timing and there is no pinging or knocking, and when the car is in its "crap" mood it will kick down and for a split second its like the car really wants to take off but it soon after it retards and the revs drop down abit. Ive talked to quite a few mechanics about this but non of them really knew cause they haven't experienced it which is fair enough. Im hoping that the modulator valve is the issue and the ecu is retarding the timing because its sensing a fault but i may be wrong! if anyone has had anything similar happen to them and solved it please let me know! Cheers Sent from my iPhone using Tapatalk Some original photos have not been recovered yet.

The kick down in a jatco transmission temperature and oil pressure dependant. If you haven't had the auto serviced for a while the sump or valves maybe full of crud oil. sounds like the torque convertor is struggling to get oil pressure so it slips and eventually builds up enough pressure to reduce slippage. back to crud in the oil or a blocked filter. might well be a auto trans specialist job if a basic valve body flush and filter an oil doesn't fix it.

Quote: Originally Posted by bachig24u [View Post] The kick down in a jatco transmission temperature and oil pressure dependant. If you haven't had the auto serviced for a while the sump or valves maybe full of crud oil. sounds like the torque convertor is struggling to get oil pressure so it slips and eventually builds up enough pressure to reduce slippage. back to crud in the oil or a blocked filter. might well be a auto trans specialist job if a basic valve body flush and filter an oil doesn't fix it. Thank you heaps for your help. I had already serviced the transmission a while back and it began after the service as that was when the car started being driven daily. I got my modulator valve changed over and that did help a lot as it was burning tranny oil. The transmission specialist took it for a drive and also realised there was no kick down below about 60kmh and said it was a solenoid issue but i did abit of research and realised that there is a kick down switch witch the accelerator pedal hits to tell the auto ecu to kick down. Taking a closer look i realised that it wasn't actually fully activating it and that was just a simple fix! To sum up, the car goes alot better but it will still have short phases of it going into its crappy mood and the same thing happens when it kicks down, the revs go up like normal but then drop slightly than build back up through the gear! Ill talk to the tranny mechanic about flushing it out and ill just hope for the best and hope it solves it! Thanks again, much appreciated Sent from my iPhone using Tapatalk Some original photos have not been recovered yet.