wrong ecu?

[mauricioazua]

i need to ask a question please take a second to read it cause i have not fin any info over the net....

i have a 92 gs eclipse (2.0 16v 5mt ) so my ecu died and i put one of a 92 eclipse gst (2.0 16v 5mt turbo)

once i put the new ecu it begin to throw lots of black smoke and it was imposible to make it start on the morning, so i check the voltage of the water temperature sensor and it was at 4v but whit no ground, ...i put it directly from de batery a ground and inmediatly work out ,.... starts on the morning whitout problems ,there is no more black smoke, but its hard to idle , and below 3000 rpm doesnt work ok , works like if i play whit the accelerator all the time .

i use a scanner and whit the ground cable on the only error that shows it is the knock sensor , the other stuff are right on the parameters, whitout the ground the water temperature sensor marks -52 cº , and pretty much all the values are bad , shows 5 errors ....

so finally i doesnt understand , whit the ground doesnt burn a lot of fuel starts on the morning , but its very hard to idle , works bad below 3000rpm.

and whitout the ground , works perfectly smooth, but burns lots of fuel, and it is imposible to make it start on the morning.

i ve reading most of your post, im pretty sure you guys can tell me if i should change the ecu for a non turbo ,
or there is some pin of the ecu that is diferent that i may change...

over the net i ve found only the pinout of the turbo ecu ...and the 1.8 n/a ecu , but nothing about 2.0 16v n/a ecu. so i can compare and decide.


best regards from Chile

Mauricio

i let you my page of workshop manuals.

www.freewebs.com/mauricioazua

 

[Joshuah Stedman]

turbo and N/A ecus do not mix... you are running pig rich ### it's thinkin you have a turbo...

 

[steve]

Steve :

i need to ask you a question please take a second to read it cause i have not fin any info over the net.

i have a 92 gs eclipse (2.0 16v 5mt ), my ecu died and i put one from a 92 eclipse gst (2.0 16v 5mt turbo) in.

once i put the new ecu it begin to throw lots of black smoke and it was imposible to make it start on the morning.

i checked the voltage of the water temperature sensor and it was at 4v but with no ground. i put it directly from the battery a ground and inmediatly work out ,.... starts on the morning without problems, there is no more black smoke, but its hard to idle, and below 3000 rpm doesn't work ok, works like if i play with the accelerator all the time.


i use a scanner and whit the ground cable on the only error that shows it is the knock sensor , the other stuff are right on the parameters, without the ground the water temperature marks -52 cº , and pretty much all the values are bad, shows 5 errors.

so finally i don't understand, with the ground doesn't burn a lot of fuel, but its very hard to idle, works bad below 3000rpm and without the ground , works perfectly smooth, but burns lots of fuel, and it is impossible to make it start on the morning.

i've reading most of your post, i'm pretty sure you can tell me if i should change the ecu for a non turbo, or there is some pin of the ecu that is different that i may change.

over the net i've found only the pinout of the turbo ecu and the 1.8 n/a ecu, but nothing about 2.0 16v n/a ecu so i can compare and decide.

best regards from Chile

Mauricio

I tried to follow what you were saying and correct your meaning. Please make sure I didn't lose and change anything important above. My Spanish isn't good enough to use with anything technical.

As is common, it sounds like you have several issues that together make getting your car running well difficult.

The ECU from the turbo car (MD166260) is based on the same circuit board as your original for the non-turbo GS (MD166255) but there are some significant differences that will effect you. The first is that the software is programmed for 450cc low impedance injectors running at 36psi fuel pressure. (411cc effective flow rate)

Your GS has 240cc high impedance injectors running at 48 psi fuel pressure. (252cc effective flow rate) So as the ECU reads the incoming airflow it thinks that the injectors will spray almost 100% more fuel than your injectors actually will. This causes the engine to run very lean and makes it hard to idle.

The bad ground can either be a wiring problem or caused by damage to the turbo ECU. When the ground is missing the sensors provide bad information to the ECU that causes it to open the injectors far longer that normal which causes the car to run very rich

One of the other differences between the turbo and non-turbo engines is the knock sensor and the electronics to read it in the ECU. Turbo cars have the sensor and non-turbo cars don't.
Since you don't have the sensor the ECU gives a failure code and pulls timing, again making the car run poorly.

The non-turbo 2.0L DOHC 16v wiring is included in the factory manuals that I have posted links to before. I don't keep the link on scribe handy so you'll need to search the site for it.

The simplest solution is to get a good MD166255 ECU, other solutions require you to modify your car to match what the turbo ECU wants and possible get that ECU repaired.

I hope this helps.