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

[netrata]

You already mentioned the problem area. One being that you will need to install the ecu meant for the 3sge and two the ecu for the 7afe ecu and 3sge ecu are different, so you will need to make the changes to those pinouts on the connectors in order to have your car running properly.

[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.

[Iceman22]

Ok thanks. But what with the immobiliser, will the car start when changing ECU?

[95CelicaST]

Don't know. Plug the new ECU in and find out. I don't think it'll cause a problem.

[Iceman22]

Is it nobody that has changed ECU that can confirm that the immobiliser will not be a problem? Most say that I will never be able to start the car when only swap the ECU and wire harness, because the immobiliser will lock up.

[Cavegod]

try it and find out.

[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.

[playr158]

there is no immobiliser on a 6gc...

what are the disadvantages?! ITS THE WRONG MOTOR ON THE WRONG ECU....every thing that ecu is doing is WRONG for that motor.
Fueling is different, timing is different, ignition is different...

Whoever said they put 3sge software on a 7afe ecu is lying to you...

3sge motor = 3sge ecu or standalone there really are no exceptions.

(nobody should ever do a swap like this :facepalm:)

This post has been edited by playr158: Sep 9, 2009 - 6:22 AM

[Iceman22]

there is no immobiliser on a 6gc...

what are the disadvantages?! ITS THE WRONG MOTOR ON THE WRONG ECU....every thing that ecu is doing is WRONG for that motor.
Fueling is different, timing is different, ignition is different...

Whoever said they put 3sge software on a 7afe ecu is lying to you...

3sge motor = 3sge ecu or standalone there really are no exceptions.

(nobody should ever do a swap like this :facepalm:)

Maybe there isn't immobiliser on US spec 6gc, because I know my car has it, that is 100%. It is marked on the car, "this car has immobiliser"
If the mechanic said he flashed the ecu with 3sge software, why shouldn't I beleive him when the car is running as it should? I know how the car behaved before and how it is behaving now.

This post has been edited by Iceman22: Sep 9, 2009 - 6:48 AM

[Bitter]

toyota ECU's are not flashable once they have been programmed at the factory except by special toyota computer systems, even then the 7afe's rev limiter is hard coded via a crystal on the board and not changeable. your 3sge would like to rev higher than 6000 rpm.

[delusionz]

This thread is very bizarre.

In theory this engine should never have been started in such a condition.

Is it driving? How do you know the 3S-GE is operating as it should? do you know someone who has a genuine 3S-GE engined car?

Why is it that your car is the only Celica in the world that can be flashed?

Tell us something!!

And as bitter points out... the rev limiter... if you feel its safe to put your foot down, try for the limiter.. (waste of time if you cant get to 7000, this is where the 177BHP is, revving to 6k gives you nothing more than a 3S-FE)

[95CelicaST]

Just plug the damn 3SGE ECU in. The immobilizer (if there is one) isn't going to do anything, because it's just looking for a signal, which it will get from the new ECU.

[soulshadow]

JDM has no smog regulations, I wonder if your Mechanic knew what he was doing or do you even realize that it might not be a 3SGE but instead a 5SFE?

[stephen_lee]

JDM has no smog regulations, I wonder if your Mechanic knew what he was doing or do you even realize that it might not be a 3SGE but instead a 5SFE?

its a 5s, and the mech that "flashed" the ECU realized that, and put the correct stock ECU in place.

This is NOT a Honda. You CANNOT flash ROM. (ROM = Read Only Memory)
Toyota Uses ROM
Honda has [E]EPROM ([E]PROM = [electronically]Erasable Programmable Memory)

[rave2n]

Clarification. You can flash a ROM....the ECU from what I understands is flashable but definately not by your local mechanic. It needs specific hardware and software to accomplish the task. Thus its not impossible, but definately not feasible.

Just because its "Read Only Memory" doesn't mean it cannot be flashed.

[soulshadow]

If somehow out of the blue, your Mechanic was also an Engineer yeah I believe it was flashable, but at this point where your car is running like a champ that just lost his belt. I don't think so.

[Bitter]

Clarification. You can flash a ROM....the ECU from what I understands is flashable but definately not by your local mechanic. It needs specific hardware and software to accomplish the task. Thus its not impossible, but definately not feasible.

Just because its "Read Only Memory" doesn't mean it cannot be flashed.

toyota ECU's are not flashable once they have been programmed at the factory except by special toyota computer systems, even then the 7afe's rev limiter is hard coded via a crystal on the board and not changeable. your 3sge would like to rev higher than 6000 rpm.

as i said

the 7afe and 5sfe ecu's are flashable at the factory when they're programmed. after that the only way you get a new program is to replace the computer. later toyota ecu's are re-flashable by toyota at a dealership level. your ecu's are built to be programmed once and then on a read only device, the only things that can be written in them are fuel trims and emissions codes/check engine light data.

[rave2n]

JDM has no smog regulations, I wonder if your Mechanic knew what he was doing or do you even realize that it might not be a 3SGE but instead a 5SFE?

its a 5s, and the mech that "flashed" the ECU realized that, and put the correct stock ECU in place.

This is NOT a Honda. You CANNOT flash ROM. (ROM = Read Only Memory)
Toyota Uses ROM
Honda has [E]EPROM ([E]PROM = [electronically]Erasable Programmable Memory)

I was responding to that, not you Bitter.


BTW: I have 80 dollors now. Can I mod my car?

[Bitter]

i was just reinforcing my point.


no