Hello.
This is my first post, though I have been lurking for years.
I have a 2007 350Z HR (78K km), euro, package (brembo, etc.).
I have just done the oil gallery gaskets (and changed a lot of things along the way, see below), and am experiencing very high, fluctuating idle whenever I start the car. The car starts at 3000 rpm and fluctuates between 2200 and 3000 rpm. Oil pressure stays at close to max (for the few seconds that I let the engine run like that). I have tried three times now and it's the same every time.
The car has UpRev tune done at Horsham in 2019.
Here's two videos of the issue
Note: the whining sound in the middle is from when I release the clutch pedal. I've had this for years, and I believe it's a bearing in the gearbox that needs replacing. Also, at some point I slightly reved the engine and then I let it idle.
After I put it together (see below for what's been done) and saw the issue, I tried the following:
Cleaned the MAF sensors with MAF sensor cleaner.
Lifted the intake box and checked underneath and inside.
Performed the "Accelerator Pedal" and "Throttle Valve Closed" procedures from here.
I don't have a good OBD scanner, but I do have the UpRev cable and checked codes with it. It only shows an error code related to the steering angle (after googling, turns out it's actually about the cruise control. I have an aftermarket steering wheel and thus have removed the cruise control switches). No other error codes.
No CEL or such.
I tried three times (while also bleeding the coolant and topping up oil), and am afraid to let the car run for more than a few seconds. Thus, I haven't performed the "Idle Air Volume" procedure, which requires the engine to be warm.
What I have done along the gallery gaskets replacement:
Cleaned the throttle bodies. Removed them while battery was disconnected. I did move the valves while cleaning. I am mentioning this because I have read of people having had issues with this.
Installed a GReddy oil pan.
Installed a ConceptZ (Setrab core, 34 rows) oil cooler.
I followed ConceptZ's guide and oriented the sandwich plate so that the lines are at the 11 o'clock position.
Removed the stock oil cooler (replaced the long stud with a Nissan short one, 15213-31U00, as the oil pan wouldn't fit otherwise. Bypassed the stock oil cooler by connecting the two pipes with each other.
Replaced all rubber hoses with silicone ones.
I didn't replace the chain, tensioner, or the guides. Should have done it, but forgot about it and needed to put the car together. Chains, guide and tensioner were in good condition.
Replaced valve covers since they were leaking at the spark plug o-rings.
Replaced spark plugs.
New water pump and thermostat.
Oil capacity is worth mentioning, as I find this a bit surprising perhaps. So far I have put in 8.5 liters and the level is at half between MIN and MAX. I filled the oil cooler and the filter before installing them and that was about 1 liter. Then there's GReddy oil pan. But the FSM says 5.5 liters on a dry engine. Which means that the oil cooler and the larger pan have accounted for another 3 liters. Seems a bit high to me.
The car has sat in the garage for 10 months (battery has just been recharged).
I took off the intakes and recorded the movement of the throttle valves when ignition is turned on.
Please help, any clues?
My concerns are:
Did I mess up the timing?
Is the ECU fried?
Throttle bodies broken?
Oil--worth mentioning that I am surprised by the amount of oil the car has taken.