I have a 90' Samurai TBI with a 92' 1.6L/8v head and block.  So everything else is 1.3L...the fuel injection, etc, etc....

I currently have the 1.3L Samurai ECM....(has a Mitsubishi logo ECM ---weird)

Will the 1.3L Samurai ECM work just fine or do I need the 1.6L/8v ECM?  

If I do need the 1.6L/8v is it a simple "plug and play" or does a 1.6L/8v wiring harness need ran?


Reason i ask is because I'm having issues where my motor runs smooth when unplugged from the MAP and sputters and backfires with flame from the TBI when plugged into the MAP. And the more I dig the more I read where the 1.3L ECM isn't ideal for the 1.6L....there are those things that "work well" and those things that "work good enough".... I'm just wondering if the 1.3L ECM for a 1.6L/8v one of those things that "works well" or "words good enough?"


Thank You!

Are you sure that the problem is with the MAP sensor. Have you checked that the coolant temperature and air temperature sensors are the correct ones for the Sammy ECU?

I better worded it. heh.

I am not positive.  When I ordered my new coolant and air sensors I specified that I have a 1.3L electronic setup with a 1.6L head and block....  I was told those particular sensors, as well as a few more, are interchangeable.

I have also replaced my O2 sensor. And my MAP sensor functions within specs (based on the 1.5v batters, vacuum pump, volt meter)

Are the ECMs interchangeable? petroworks said that a 1.6L/8v ECM may be the ticket and if not I can always send it back..... but i don't want to go thru the hassle of swapping and shipping if the 1.3L ECM runs a 1.6L/8v head and block just fine.

Are the ECMs interchangeable? petroworks said that a 1.6L/8v ECM may be the ticket and if not I can always send it back..... but i don't want to go thru the hassle of swapping and shipping if the 1.3L ECM runs a 1.6L/8v head and block just fine.

Samurai and trackick ECMs are NOT interchangable.  Petroworks should know this.
You will need to use whatever ECM matches the intake and wiring harness.
Do you have access to a known good samurai EFI ECM?  90-93ish samurai ECMs are known for going bad and causing odd issues when they do (although, generally the engine just won't run at all).

Is the injector itself the same between the 1.6 and 1.3 TBI units?
or does the 1.6 injector flow more fuel (PPH)?

Is the injector itself the same between the 1.6 and 1.3 TBI units?
or does the 1.6 injector flow more fuel (PPH)?

They have different part numbers.  But they are the same dimensionally.  I have ran trackick injectors in samurais before and they appear to work fine.

only out of curiosity...not a debate or objection....

Why won't a 1.3L TBI work as well as a 1.6L TBI when it's "only" purpose is to house the movement of air and the spray of fuel.....  wouldn't the 1.3L ECM just tell the 1.3L parts to move more air and spray more fuel to have the same mixture ratio that is needed to run the 1.6L motor?

That's kind of where I was going with my question, but the problem could be
that the millisecond range and the range of tolerance in % of the ECM could
be to limited to give a 1.6 the correct amount of fuel it needs on a normal
injection cycle, until you do something like trick the ECM (line off the MAP)
into thinking it has a low vacuum situation (throttle open/power needed) that
kicks the ECM into thinking it has to make up for a lack of fuel.

If the injectors are dimensionally the same, I might suggest getting a 1.6
injector swapped into the TBI unit and see if it helps your situation.

I'm not saying a 1.3 EFI system cannot run a 1.6, but you might have some
other problem that is making your system act the way it is, and the larger
injector might be the help you need, although it might be a band-aid but I
think you have done a reasonable amount of digging and work on the truck
that if it were a normal problem you would of caught it

Wild

only out of curiosity...not a debate or objection....

Why won't a 1.3L TBI work as well as a 1.6L TBI when it's "only" purpose is to house the movement of air and the spray of fuel.....  wouldn't the 1.3L ECM just tell the 1.3L parts to move more air and spray more fuel to have the same mixture ratio that is needed to run the 1.6L motor?

I don't know the answer.  I just know that some people report that 1.3 injection on a 1.6 doesn't work well, while others think it works fine.  Now every persons definition of "fine" is probably a little different, but I do know the people that say it doesn't work well, state that there is a definite miss/stumble that isn't there with running all 1.6 stuff.
It could be that the fuel required is beyond the parameters that the 1.3 ECM can compensate for.  It could be that the 1.3 intake and TB doesn't flow good enough.  I could be something else entirely.
I have never personally ran 1.3 injection on a 1.6, so I don't have any first hand experience with the issue.

What was that saying on the Bud Dry commercial..."Don't ask why just try Bud Dry"

The 1.3 mapping is quite different from the 1.6 map. This is because the torque curves are different, I forget which way round it is but the difference is most pronounced around 4000rpm.

I have a donor 95' 1.6L/8V Tracker. On that Tracker I popped the hood and noticed there are more connectors and electronic "stuff" on this vehicle.... so when I do my "full 1.6L/8v conversion" do I need to pull off everything that the 1.6L wiring harness plugs into it and move to my Samurai ?

Right now I have the 1.6L/8v head and block...and 1.3L everything else... that is soon to change thanks to my donor car...

do i just move it all?


Thanks!

 

Move the complete intake manifold, along with all the sensors on it.  Move the 1.6 distributor, coil, ignitor (the little box on the coil bracket), MAP sensor (the little rectangle shaped sensor that is bolted to the firewall over by the battery), O2 sensor, main fuse box (mounted on the passengers side inner fender),    Anything engine related that the 1.6 wiring harness plugs into in the engine compartment needs to be moved (you don't need the following 1.6 stuff/wiring....headlights, turn signals, marker lights, windshield washer, horn, windshield wiper motor, ABS/brake stuff over around the master cylinder, AC stuff).  Just don't cut any of the 1.6 harness, unless you are 100% sure it goes to something that is not engine related.  If in doubt...ask and/or post pics...we can tell you if you need to keep it.

Cool - thanks! That makes sense really .

How about the exhaust manifold...is that worth changing over? They are different . My 1.3L has a single pipe going from exhaust manifold to cat converter...the 1.6L has a twin exhaust pipe from manifold that combines into 1 right before the cat converter.  I think that was the year fast and furious came out -- maybe that has something to do with a twin exhaust manifold.  I can change it if needed or would be better

Cool - thanks! That makes sense really .

How about the exhaust manifold...is that worth changing over? They are different . My 1.3L has a single pipe going from exhaust manifold to cat converter...the 1.6L has a twin exhaust pipe from manifold that combines into 1 right before the cat converter.  I think that was the year fast and furious came out -- maybe that has something to do with a twin exhaust manifold.  I can change it if needed or would be better

Actually, most, if not all, 1.6 8Vs have the dual down tube exhaust.  You could swap the manfold and downpipe if you want, but it probably won't bolt up to your existing exhaust system.  I don't know that the dual downpipe is any better than the single.