Trying to help a mate diagnose a problem...
MR2 2l 3S GTE turbo. Problem is that since he changed the head gasket and timing belt, it's running far, far too rich and will not idle. If the engine revs are held at around 1000 with throttle slightly open it will sit there for a few seconds to a minute but then race off to 4k odd rpm accompanied by black smoke and lots of petrol smell.
Valve/cam timing and ignition/distributer timing is exactly as stated in the factory manual and the ECU shows no error codes. Checked the Oxygen sensor, which is giving the correct signals according the the flowcharts.
It was apparently running ok prior to the gasket change, but with a rather large oil leak from the head.
Sounds to me like a vacuum/unmetered air leak, but just can't seem to find it.
Any ideas?
Lee