Vvti tiptronic cutting out

Bit of a weird one. Having not owned a vvti supra before .. I've done some research and it seems they can be a real pain in the ass.. mine is

When I bought the car a month ago it was fine.. no troubles or idling issues etc .. I havent messed about with anything under the bonnet nor have I added any fuel cut defenders etc .. the car was bpu when I bought it..

When I was slowing to a stop coming up to a roundabout in drive ,I went to pull away and the engine had cut out.. restarted and continued to next roundabout where it cut out again .. the revs just drop too low and then it cuts out.

So I got it home and after speaking to a few people I ended up spraying some carb cleaner onto the throttle body butterfly and wiping as best I could with out removing the whole unit and trying not to disturb anything or pushing too hard. When I removed the intake pipe going to the throttle body there was a small amount of oil in a tiny puddle near the end of the throttle body pipe .. is this normal ? ..

Anyway .. after cleaning throttle body I put I all back together and went out for a drive. Everything was fixed and fine ... or so I thought.. was good for around a week or so now the symptoms have returned. .

So I reset the ecu by disconnecting negative on battery for 30 mins. Also done the tps reset trick by turning key to on position and holding accelerator down for 10 seconds. I heard no noise or humming so maybe it didn't do anything.

So I took it out again and it was the same.. ecu took a few minutes to readjust then went back to almost cutting out.

Got home again and while engine was running,disconnected the tps connector .. car idled at 1600 rpm so I turned engine off unscrewed the tps a little bit and sprayed some carb cleaner in the crack that I managed to pry open.. screwed it back and reconnected everything.. .. took car out again .. got it to normal running temp and now it's fine again idles at around 800 rpm with no aircon etc .. doesn't cut out or look like its going to cut out..

I'm stuck .. I was thinking to remove the throttle body completely and clean it up real good.. but also I'm starting to think my tps is a bit weird...

Also .. since the weather has got hotter it's started to do this behavior .. coinsidence or fact that supras don't like 30 degree heat outside ??

Anybody with some good advice would be very much appreciated

Buy a blue tooth obd2 connector and install torque on device to read error codes

http://www.amazon.co.uk/Maxiscan-ELM327-Bluetooth-Wireless-Diagnostic/dp/B006JJZVQE/ref=sr_1_2?ie=UTF8&qid=1435815574&sr=8-2&keywords=obd-ii+bluetooth

http://torque-bhp.com/software/torque-android-obd2-adapters/

Drop it off to lee bolt an Srd kit on go syvecs so it does the throttle stuff and away you go ;-)

Wish it was that easy mate.. unfortunately it's not lol

I would start by getting a decent garage with modern auto electric skills to look at the outputs of the throttle position pots on the pedal and the TB. They work in reverse and their outputs need to be 180 degrees out of phase, with no dropouts. usually if there's an issue the ECU will log a fault code. The throttle position motor itself may be faulty, you may find someone with a tool, or home brew device to remotely control the motor and see if it responds correctly. There are commercial tools on the market to do just this, but I made my own. This is quite specialised stuff, and you need to find a place with a full understanding of how it is all supposed to interact. Short of just replacing expensive parts ad lib at home I fear you are unlikely to make a financially efficient job of diagnosis and repair without professional intervention

Here's a short video of one of the more basic throttle position motor testers available commercially:

Thanks for that very in depth reply Chris... I just wish I understood what you said haha..I think I will just try as much as I can before starting to replace things. It seems like the vvti supra isn't worth the hassle it seems to give out.

It's never anything simple with me