1994 Sidekick 16v AT 4x4 4dr virgin ECM Ruby's still there

[fixkick]

Hello I am new to this. I have never posted a question before. Please I need help!
I did not know how to start a new post so I looked for similar problem. 1995 Sidekick 4x4 Man Trans, MFI 1.6 16v Calif. Emissions,
Problem Injector Pulse width 4.8ms at idle.
Black smoke and strong fuel smell from exhaust pipe. Runs great, idles great has power, no  hesitations but runs very rich.
No DTCs
Blinks 12
Tech 1a : No DTCs
Basics have been done, Good compression 180s min difference 5psi, Ignition and spark plugs and timing at 5 BTC. Fuel pressure Koeo 36 then 31 and and hold above 26 psi for more than 1 min.  Although the following data stream from Tech 1a shows:

Engine speed 788 rpm
14.8 Volts, 16 % charging.
Rich status
AC and Power Steering off
EGR Temp 142F
EGR off
Idel switch on, Fuel Pump On
IAC 28 L/min
Idel Adj Mont 0%
5 to 17 degrees spark advance
Injector Pulse Width 4.8 ms
St Fuel Trim 128
Lt Fuel Trim 117
HOS .894 mv Activated  but not sure if its switching 1200rpm 1500rmp or 2500rpm?
Close Loop I am determining by causing a vacuum leak  pulse width goes down and and spark advance too.
TPS .86 Vlt 0 degree angle
ECT 147F ( This is error of Tech1a)  Tested at Pin 9 ECM/ECU .66vlts 320omhs at ECT disconnected ECT connector pin 9 back probe Idle goes to Ref. Voltage 4.7 182 degrees infared. (all good)

MASS 2.4 g/s   ( idle rates look good)
IAT tests 75 degrees 1900 ohms

Parts new Fuel press regulator leaked pulled hose,  O2 sensor resistance out of spec., CAT damaged,
EGR and Sensor, CEL  on DTC 51
Spark plugs wires and CAP rotor and oil change fuel saturation
Timing Set to 5 BTC Ground Duty Cycle Connector

exhaust manifold off,  is #4 tube (cast iron) cracked, as all love to do making O2 go nuts.
ECT reads wrong, 147f IS Dead wrong on a hot normal engine, bad thermostat or the floating thermostat missing the mandatory rubber ring? (wrong ECT?)
thanks for sharing the tech1, data,  a very rare test tool still working this old.

all looks good, for sure fuel trim dead center at 128
I guess it is intermittent, that fueling goes wrong.

then monitor O2 all the time. to see if it goes nuts or fuel trim goes way off. at idle or steady cruise at 25mph or 45mph.  closed loop holds, at steady right foot cruise.

yes some tech1a have the wrong conversions for ECT, many have see that,  my guess do to suzuki using different ECT on all G16a for sure in europe, type 1,2,3,4, engine there we do not have. USA
Is see you checked the volatage and 0.65vdc means ECU is good at 180f, for sure. so you ROM pack in the tech1 is too old or wrong one. (vitara not sidekick tracker) but is  white elephant and not a true problem with engine or EFI nor sensors.
that is if the thermostat is not missing its rubber ring,  and then floats randomly and then ECT temps fall driving, about.

if thermostat is for sure good and solid, all the time hot
look for 02 reading wrong or long term fuel trim LTFT going wrong at cruise.


Nice presentation best ive ever  seen for 1995, thanks for that.

Fuel pressure Koeo 36 then 31 (running)
5 PSI drop from kOEO , to idle,  looks great.




refr, tech1,

https://fixkick.com/ECU/Tech1/full_scan2.html


watch O2 and LTFT.  (STFT is usually to fast to understand)
are you saying it is rich , even running above at idle.>? I think yes.
if yes seems it has wrong injectors in engine, too big.?  (wild guess) 4.8ms at idle. (i DO NOT KNOW idle injector rates on this year , hot idle)
based only on LTFT shows normal,


I see why you ask for help, a tough one it is.


cheers to you and good day.