98 JS Sport - Some challenges

[fixkick]

Thanks for the reply - I do have a whole list of parts in my shopping cart at Rock Auto.. \they can get them to our forwarder in Miami and that's good enough.. Just the wait is all. Thanks for the tip.

I just finished replacing the clutch on it - Oh - 4x4 5 speed - and am now noticing it running rough and missing on steady rpm under load. i.e. it sputters if I keep it at 3,000 rpm and also when I try and accelerate.
Treat it like a race car (WOT) and it performs fine...
As much fun as that is - it's got 150,000 miles on it and I don't think she'll take that for long.
Did put a new cylinder head about 5,000 miles ago and a complete refit is the plan.

The transmission is running very well, it's the engine that is coughing and sputtering. I used GL5 lube in both tranny and transfer case. Seems fine.

So What you are saying is to replace my upstream O2
I do like that I can lose the CAT. Do I still need to put the downstream sensor in the mix or can I cut it lose?
id just tape the whole sensor and harness there to the frame rail. (for the next owner, or?) the heater wires must not touch to car body. (bare or conn, pins)

Is is a possibility to remove both up and downstream sensors? Or would that totally mess things up? You see - it's our get around vehicle too and we need a quick fix while we wait for parts. Possible? may be
if you remove the upstream it will go rich and stay there. i bet. suck fuel and foul sparks,,, inplug it for a day (front) and see if the sputtering stops.
or worse..

CEL - Service Engine Soon Light? yes, it's on but don't know what the code is. Don't have a reader.. Where is the one that is USB cable
? Be good to have.
any usb cable ELM 327 works, it like $9 there. OBD2 adaptor.
it be fun to see what the upstream sensor is doing,
if the exhaust leaks, air that sensor reads lean, (false) and the fuel system slams rich , fouling spark plugs and sputtering,
the engine will run like dream with the front 02 working, it will with any tight exhaust system.
that cheap scan tool will show Close Loop, (CL) and the Long term trim will be like -5%
if the exhaust leeks, the EFI will Add tons of fuel, say +40% long term fuel (LTFT) and foul plugs,
usually lean is bogging, not sputtering,
what happens, is the AFR is like 9:1 , if O2 is fibbing like above, sputtering, then you go WIDE open throttle the ECU cuts the o2 out of the circuit and
goes to PURE MAF readings, and snaps to a perfect 12.5:1 AFR, full power, and no sputter.
id try pulling the 02 front see if it sputters less, as the pull O2 voltage goes to the middle. range, removed. ECU does that trick.
This can aid diagnosis scan tool free.
your 16v has the 02 bung on the end of the exhaust manifold collector end. so its ready to receive a new one, discounted here.
the bosch hand wired one, (no conn) is 15730-4

http://www.ebay.com/itm/Genuine-Bosch-15...f0&vxp=mtr


the pnp (with connector ) is 13073 bosch, plug and play.

the Front 02 connector is on the left fire wall , next to brake booster, it has and unlock lever.



Cheers.