Hi at all,

I'm new here, i'm from italy, first of all i have to apologize for my english.

I have a 1994 suzuki samurai, i recently put into it a 1.6 G16A with its intake manifold and tbi, i'm using the original 1.3 distributor, oxygen sensor, Map sensor and ECU, i also removed the catalytic converter and disconnect the second oxygen sensor.
The engine is not running well, the idle is rough and when i rev the engine it hesitate badly, i even saw a backfire frome the intake one time.
With the orginal 1.3 engine fuel injected i never had no fuel problem at all ( i put the 1.6 because the 1.3 engine was cracked somewhere and it had an  water burn problem).

I don't have ECU Errors.

A strange thing that i have noticed is when i disconnect the Coolant Temperature Sensor The engine seems to run better, But is not at 100% of it's capabilities, it could be at 65% , but i have a lot less hesitation and the car is almost driveble.

I know that you in the USA are familiar with this type of modifications on this samurai, if you can give me some advices i would be grateful

Hello At all

I have read about issues running the 1.6l injection with the 1.3l computer.  But people have just swapped the computer keeping the 1.3l wiring in place.

I would give that a try.

Thank for your answer, i recently tried to disconnect the MAP sensor and it works better than before, so before swapping the ecu i'm going to find a 1.6 map sensor and try to use it istead the original.

The original Code of MY 1.3 ECU is 33920 - 81C70, What Vitara ecu can be compatlible with mine?

Any of the 1.6L 8-vavle manual ECU's should work.

If the map sensor that isn't yet arrrived won't fix the problem i'll try to replace the ECU.  Thank you a lot man.

You'll need to swap a few wires around to get a 1.6 ECU to work. I'm surprised that you have a second O2 sensor are you sure about that? what market was your Samurai built for?

Is for the italian market. Yes is a O2 sensor on the catalytic converter. I didn't try to disconnect it with the original 1.3 engine, but now wit that disconnected i don't have the check engine light on and i don't think that is the problem now.

Changed the map Sensor, the car is running as before, I saw that there is the gasket between the upper part and the lower part of the tbi, that is in a point completely destroid (Numer 14 on the picture) , i can see light of my torch passing trough the two parts of the tbi. As soon as possible i'll dismount the tbi and i will put new gaskets on it.
I don't know if that gasket can cause some problem, maybe it can disturb the vacuum sistem that actuates the fuel pressure regulator.

If your pulling extra air in that can cause an issue as the air isn't being registered by your mass airflow sensor.

It's been a while since I went over 8 valve wiring.

But the map sensor is connected on the intake manifold after the leaking gasket, i think that this additional portion of air is registered.

Do you have a 1.6 samy too?  Do you use the original 1.3 ECU too or a 1.6 ECU?

I've had 8v and 16v Trackers, both pre and post 96.  On the 96 the sensor is on the intake, that is probably what is throwing me off.  I thought you had a sensor on the upper half of the throttle body.

Understood,

In these days i tested fuel pressure (Stuck on 2.7 Bar), regulate the tps sensor and i retarded the ignition timing, The car runs better, but i have always a big hesitation  at low rpm when the engine is hot, and tonight the car had a very unstable idle, it jumped to 1500 rpm to 500 rmp a lot.

The isc valve since i start the first time this engine is unbeliveble noisy, it's seems to have a guy hidden in the engine bay, that fires a machine-gun all time,
I don't know if is normal, and i am not sure if this component can causing strumble or hesitation if is malfunctionig.

This saturday i will try to dismount completely the tbi and all compoents to see if i can find something wrong....




I tried to replace all tbi gaskets still doesn't working.... It remains the ECU and the injector.....

OK i replaced the ECU with a 33920-56B70 the engine runs i think almost perfectly, i have a little hesitation on low rpm that i don't feel driving but when i rev the engine in neutral position,  i see blue smoke from the exhaust when the car is decelerating, my fear is that the valves oil seals are gone, and i suppose that they get dirty the Sparks, but i am not totally sure about this.

Thank you for all the advices that you gave me!!!

OK Now i used the car i little bit 80 km today, I have the same problem always, with the temperature sensor disconnected the car runs, if i connect that, i have always the big hesitation and the car won't run. Temporally i'm going to use the car with this sensor disconnected, but i want to solve this problem and i just bought on ebay a brand new sensor, but i am not sure that this is the problem.
Now with the 1.6 ECU the engine has all the main VITARA's components (except for the Distributor the ignitor and the ignition coil, but i don't think that these can cause this problem) and i don't know why this car won't run properly.