Suzuki 1.6 16 valve rough idle

[Shears#22]

I’m new here. Got a samurai with a 93 sidekick 1.6 16 valve engine, ran like a sewing machine started dying at idle but over a month span it got worse started skipping and reving at idle. Long story short I have replaced every sensor on this engine including having the engine rebuilt. Have removed injectors cleaned them. All new vacuum lines, new fuel pump, fuel filter, fuel regulator, new cold idle control valve, new idle control valve, cleaned throttle body, you name it I’ve done it. After all this it still runs rough at idle and cylinder 3&4 on the header tubes get cherry red vs 1&2 do not. Any help would be great! It’s basically a bran new engine only things that haven’t been replaced is O2 sensor , injectors and ecu

[fixkick]

This is a FrrankenSAmmy we all love
but what is under the hood knowbody knows (in the cloud)
its misFIRING and racing high RPM idle both?
so it has TRACK,/side kick B16B ,16valve engine, vastly newer
no year engine told.
odd has hell the 2/3 cylinders are too hot, not all 4, hinting at injectors bad? or intake air leaks or even injector cushion o-rings sucking air?bad.

the 02 runs all 4 cylinders never just 2.
so is not that. but you can remove the O2 (means front) connector and drive see if it runs better, this is a trick that fools the ECU.

does the engine have just below, the front crank pulley CKP sensor , ? if yes the engine serial number tells the year of the engine.
92 to 1998 is possible.
what year ECU is this?

a 96 up ECU has OBD2 in USA> by law. and x10 more easy to diagnose using oBD2 PID scans.
map sensor dead , in limphome?
is MPG LIKE 15MILES PER GALLON BAD, mINE GOT 30.

so is the CEL wired up or forgotten.
sorry all I have are 20+ questions blind.
we key on any car this year range and the CEL must glow first.
then start the engine and CEL must go out.
if not we work that angle first.

the problem can be 1 wire rusty ,
simple as that. testing finds this.

no photo of your engine,
got cold air kit that beats the MAF to death bouncing endless? hopeless that. and limphome is a horrible place to be.

limp is full max nasty rich and yes exh header glows. read. as fuel burns outside the engine like a ROCKET>
the glowing will be worse on the thin wall exh header tubes, and ive no clue there on how thin.me.
i guess the CAT is missing right ?and the limp home will not melt it solid , missing it. ( good thing that) if melts it blocks the exhaust and in the end will not run or only 5mph.
I can not see your engine. at all.

or tell what all that came out of , what car was the DONOR ,nothing could be more important that.

I bet the Diagnostic port DLC will tell us what is wrong this bad.
but IDK.
95 engine ,or less
or 96 up, ? USA fed. laws dictate what was there.

[Shears#22]

To answer your questions, it’s a 93 Suzuki sidekick is what engine come out of.  it’s OBD 1 I have checked for codes and gotten 33 & 34 which refer to MAF sensor. I have put 3 MAF sensors ranging from 150$-425$ no change! I have checked power and ground to sensor solid 12.8 v. I have ohmed wired all way back ECM checked good! Here is a parts list of what I’ve threw at it with ZERO change.

-New EGR valve.
-All new vacuum lines
-New o2 sensor
-New Cold idle control valve
-New Idle control valve
-New TPS
-New plugs & wires ( gaped to 28)
-New distributor and cap.
-Checked timing multi times. Timed on 4.
-Checked keyway!
-Pulled engine and rebuilt had block and heads worked and checked
- new timing belt, oil pump, & water pump
-All new gaskets & hoses
-Removed both lower and upper intake cleaned all ports including the 4 small holes inside lower intake
-New temp sensor ( going to ECM)
-New PCV valve
-Removed throttle body and cleaned
-Installed new fuel pump ( bought from trail gear high pressure pump )
-New fuel filter
-New fuel regulator in fuel rail!
-New reman original injectors ( all new seals)
- exhaust has no CAT just headder, pipe, & muffler. It’s not stopped up. 
-There is nothing on this engine that I have not replaced or checked. Nothing has changed still burns extremely rich idle is rough almost like it’s missing. Give it gas it sounds normal on high end. There is no crank or cam sensor on engine.

As far as pics I’ve tried to upload multiple pics for some reason they will not upload. If so there not showing on my end.

[fixkick]

you have other post about MAF
I answered it fully

yes the Ezgallery icon is missing, I do not know why but it is linked off sticky post 2
https://fixkick.com/forum/ezgallery.php

add photos there
and copy the BBS code to your forum posts.

here is the sensor page gallery,click ADD PICTURE

https://fixkick.com/forum/ezgallery.php?...lery&cat=5

note that I have real suz MAF there show original P'/n fully.

or G16 page

https://fixkick.com/forum/ezgallery.php?...lery&cat=1