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

[Iceman22]

Hi. We asked all the workshops and car electricians in the town about swaping the ECU, and all rejected the offer.... They said it wasn't worth it because of the wire harness and risk with imobiliser problems. But we find one workshop who was able to reprogram/flash the 7A-ECU with 3s-ge software. The car is now running fine according to them.

Which disadvantages are there with 7A-FE ecu and 3s-ge software? According to the workshop they said it won't make a difference, but it may be some sensors that were one the 3s-ge wireharness that I dont have.