Xtype2002

Hi all, I'm new to this forum, would appreciate if anyone has solved this issue - I can understand there may have been several different faults (if they were air leaks in the air intake system eg vauum leak(, however aftr checking everything except for the EGR valave operation - Ive run out of plausible options. Ive replaced the plugs and coild packs with NGK brand. Checked with soapy water all of the air hoses/cpnnections that i can view from the top etc. I also removed the IAC valve, it opens around 3-5mm when activated and seems free, is this enough? Is it possible it is not holding it open enough or is fluctuating? I have some fault codes - P0037 & 57 both HO2S heater control circuit low bank 1 & 2 sensor 2 (both codes) P1646 Auxillary inouts auxillary outputs P1647 Heated oxygen sensor control module bank 2 open/short Is it possible any of these are the cause, it seems odd, it only occurs during cold start and intermittent during that period, so hard to diagnose when warmed up... My car has no misfires, I did notice a small amount of oil in the manifold balnce bowl when replacing the o ring... Thanks, Shane

Ive recently purchased a 2002 Xtype 2.0lt with 89,000 original klms. Its a great clean car, looks to have been very well looked after, dealer service history etc. The engine air intake has an odd gurgle noise which only occurs on cold start, is intermittent during this short period, dissapears when you lift the engine rpm just above idle. When first starting and the engine idle is high, it doesn't appear until after a few moments when the idle speed settles back to standard - around 750rpm. Ive changed the spark plugs (NGK Platinum, new coil packs - NGK, ive checked for air leaks around the manifold balance chambers and other air lines and connectors - cannot seem to find any. (I did NOT remove the air intake manifold for this job, the noise was there before i completed this task) The noise dissapears when engine operating temp is reached, it gradually dissapears during warm-up. Otherwise the car drives great, plenty of power runs smooth idels smooth. If anyone could shed some light on this it would be very much apreciated. Ive included a short video of the noise to demonstrate. IMG_3226.mov