OBD 1 O2 sensors

Hello everyone Kinda new to posting but i have read alot. i own a 91 VR4 after buying it and trying to get it registered i found out that the car was running way rich but the computer was saying or thinking it was lean. :frown: unfortunatly i have taken it to the dealer thinking this would be the best way to get it fixed correctly. so far they have replaced the tps, idle stepper motor, and something else in that area. and i believe some of these were bad cause every time i undid the throttle cable braket the car RPMs dropped and then it stalled. and when i was driving the af meter pegged lean until two thousand RPMS or so then it pegged all the way rich. when the meter jumped you could feel a power shift in the car. my question is on the obd1 is there four o2's or just two the person i bought it from said there was two. the after market downpipe cut out the precats, but there was no need to trick the computer as if the upstreams were using a precat.The dealership is telling me that there is no signal from the upstream o2's are these the ones the down pipe cuts out? Or maybe someone could point me in the right direction cause i have tried to search the site and i could not find anything or i apperantly dont know how to use the search engine either could be true with me:grinyes:

First off, of course the car stalls when the throttle bracket is unbolted. It needs to be bolted in the exact place to give you a lack of slack in the line. If you don't bolt it back up, or bolt it in the wrong place, it will screw with how far open the butterfly in the throttle body opens.

Secondly, I'd get it out of the dealership. Sounds liek they have no idea and are just tossing parts at it.

Thirdly, yes there are only 2 o2 sensors in your car. They are just after the turbos, right before the precats. It is relatively easy to determine if htey are working or not. I would have also pressure tested hte intake first.

One question...were you getting a Check Engine Light?

No i never got a light the closest thing to that i got was a light for the air bags. sorry i thought the bracket took the slack out and the idle screw was what controled the idle, the only reason i say that is i could have sworn on my 99 SL when i took the slack out and had the bracket loose the car idled properly but after thinking about it the car was probably off so that is why i thought that sorry. So they are telling me it started out at around 5,000 PPM and they are down to the mid to low teens if i get it back where should i look without having any equipment and no CEL codes in the dash?

With no throttle cable the car will still idle. The SAS screw on the TB is what hold the plate partially open when it trying to be at 0% throttle. Case in point. When I put the Talon back together it had two different mounting points for the throttle cable. I put it on the wrong set and the cable had tons on slack. Pressing the gas pedal didnt even open it up, yet the car started and idled.

ok so i had it checked at a shop first and they used some sort of gas that they put in the gas tank not fuel but something that was in a gaseous state they then pressurized the fuel system and found out where it was coming out. They gave me the results and told me that they did not have the equipment to test all the electrical and i was better off at a dealership:banghead:
on stealth316's website i think i once saw something about testing the o2 sensors with propane or a heat source would that work and get those leak results fixed? When i gave the dealership:shakehead those results they acted like the leak test should be last. Am i kinda headed in the right direction now?

ok first off, to my knowledge, any problem with an o2 sensor should throw a check engine light. Not 100% positive..but I think so. Secondly, I have no idea what fuel pressurizing test would have ANY thing at all to do with the 02 sensors. And thirdly, I have zero idea why anybody would immediately think this had anything to do with a fuel leak. Fuel leak you can smell if it's in the tank or lines, and if it's the injectors...it will run pig rich and you can remove the oil cap and smell gas in your oil.

If you still wanna test your 02 sensors...stealth316.com has procedures somewhere under the technical section, adn removal directions under the garage section.

I think the intake pressure test (http://www.supercar-engineering.com/rubberducky/3S/Maint/TT/IntPresTest/index.html)should be done first. Starting it up and having it idle anywhere over 2k makes me think some huge intake leak. Perhaps the manifold isn't seated properly. Also the fact that you are not just seeing idle problems..but rich/lean conditions.

Could you please tell us any maintainence or work you did on the car around when this problem started happening?

Also, stealthee is right, a loose throttle cable wouldn't cause it to stall...my mistake. Don't know what I was thinking there. However, to run correctly, you want the minimum amount of slack on it, keeping it tight, but not too tight as the butterfly is partially open at idle. Whenever I adjust mine, I remove the y-pipe and make sure the butterfly plate is completely closed and then get it as tight as possible. Anyway, instructions here (http://www.supercar-engineering.com/rubberducky/3S/Maint/All/ThCaAdj/index.html) if you need/want them.

Sorry guys i know its been awhile i just wanted to thank all for their help,
unfortunatly i really have not done much to it myself when the problem showed itself. i had just bought it and it came that way (MY Bad). Anyway finally got enough cash to get it from dealer (being poor and 3000GT dont mix well) and my feeling of a larger problem being present showed itself. I am pretty sure i blew the rings in the front passenger piston. i was on the freeway pushing 10 psi at the most and lost some power along with a large cloud of smoke. i should have just stopped there but i was not far from home so i tried to limp it home and it stalled. when i restarted it the oil cap along with whatever was left of my oil reserve blew out the filler hole on the valve cover. at that point i just had it towed. I know i should have stopped right at the first sign of trouble that was stupid of me. Anyway so far i pulled the plugs on the front and the one plug was oil soaked and the rest was fine so pulled the front valve cover and everything looked okay. my brother thinks it is the rings. i will pull the back plugs and cover tommorrow and if everything looks good on the valve train from the top i will pull the heads and go from there anyone have any ideas.