Installed new engine, and got unsolved problems... Options

[Iceman22]

Hi.
This week the workshop finished swapping engine (3s-ge) from a JDM ST202 into mine AT200 (7A-FE). The whole exhaust incl. the cat was also swapped. The new engine only had 80000 miles before the swap.
Almost everything seems too be fine except this:

1. Rough idling and very poor engine performance (feels like 60hp). Engine gets very warm when driving. Also when the engine is cold and I start it, I have to give some gas in the beginning or it will shut down. The muffler is also making abnormal noise.

2. Fuel gauge is showing lowest position and yellow lamp lighting. Before I delivered the car it was showing half tank.


What can be the cause for these problems and where should I start for solving these problems asap?
The ECU hasn't been swapped yet.

And sorry for my bad english..

This post has been edited by Iceman22: Oct 4, 2009 - 11:56 AM

[95CelicaST]

1. Different engines make different sounds. It's nothing to worry about, but could be effected by #2.

2. There is an O2 sensor that would go in that hole near the cat. If this was left wide open before then some exhaust would leak out there and make the car louder.

3. I don't think this is true.




And I think what bitter was asking is if you could take a picture of the ECU presently installed in your car.