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]

ECU is the problem. You're trying to run a 3S-GE on a completely unrelated ECU. The ECU is trying to keep the engine running at 7AFE parameters when in reality it's probably doing a bit of damage.

You NEED to have the harnesses (3SGE and 7AFE) spliced together and running the 3SGE ECU. If you have the full JDM harness for the 3SGE then its just a swap over and plug into the proper ECU.