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Okay, so update time. I took the acis valves off, replaced the gasket, swapped the acis unit for another one, yet the problem continues to exist. Nothing noticibly changed. same rpm range, same sound. I've checked, the system does still work, you can see the valves open up above 5100rpm. Also have m...

Did removing them create any new issues? and more importantly, did it fix your previous issue?

Thank you very much for the info!

I plan on removing the intake to check, does the intake have a seal where the valves are situated? If so can I reuse the seal?
How can I see if its fitted with the TVIS system?

I have not found a solution for this yet, any help would be much appreciated....

Hello everyone, Since I've owned my MR2 (more than a year now) I've experienced a rattle in the engine bay from around 1750-1900 RPM. The sound is starting to bug me more and more, first I thought it was the exhaust but it clearly comes from the intake part of the engine (3SGE). (prntscr . com/hhczh...