Car studdering, running rich, after attempted 02 install

[DNA666]

Damn, I just have no luck/skills at all.

So here is my attempt at stating the problem. 95 GSX

I had mitsubishi run codes for me and I had a rear 02 code. This was expected seeing as my 02 sensor bwas pulled out accidentally during my engine swap. My car has ran great since May when this was done and I have been driving with the CEL on since then.

Fast forward to Monday night when I decide to replace the 02 sensor for emissions testing. I went ahead and dropped the exhaust, replaced the 02 sensor and put the exhaust back up. I go ahead and start the car up and it idles terribly around 200rpms and thick black smoke reeking of fuel is coming out of my exhaust. I shut the car off and after some research find out that ther exhaust has grounds for the 02 sensors on it. 1 before the CAT and 1 after. I to myself at the fact I thought these were just extra supports and the 1 before the CAT was never reinstalled after the new engine was swapped in. I look under the car and see in my haste I failed to propery install the 2nd grounding strap this time. (so neither grounding strap is hooked up at this point)

I go ahead and hook the 2nd (after cat) one up and turn the car on. The car idles noticcable better but not good enough. I'm still running rich as hell. I hook the 1st (before cat) one up and it idles even better yet still running way too rich. I shut the car off. I go to start the car and the car won't start, after trying to jump it it still will not start. I think I fouleed my plugs but am unable to check at this time due to a lack of tools until I get home today.

So even after I get the car started. I don't see what in the hell I could have done for the car to start running so rich. The second 02 sensor has been unhooked since May so I would think it has nothing to do with that. I was thinking it's possible I somehow (no idea since it was never touched) broke my 02 at the 02 housing by starting the car with no ground or hooking the new 02 (after the cat) up wrong for a few minutes before unplugginh it. (the wire harness broke so I had tom ake a harness from a molex connector)

Has anyone had just the front 02 sensor go bad? And if so what how did the car run?

 

[dave99gst]

reset the ECU -
check to see how bad you fouled out the spark plugs.

 

[DNA666]

I'm doing that whaen I get home from work. But even if that's why it won't start and I fix that. That will not fix the running rich/studdering problem. I have already reset the ECU before the car stopped starting and it was still running rich.

 

[akdsmer]

(the wire harness broke so I had tom ake a harness from a molex connector

Sounds like I would be looking at the O2 wiring to ensure it was wired correctly.

 

[ddavisaf]

I'm doing that whaen I get home from work. But even if that's why it won't start and I fix that. That will not fix the running rich/studdering problem. I have already reset the ECU before the car stopped starting and it was still running rich.

Maybe not, but fouled out plugs will cause your car to studder and run rich. I think everything else has been covered.

 

[DNA666]

Sounds like I would be looking at the O2 wiring to ensure it was wired correctly.

Did you read? The 02 harness has been broken for over 6 months with no issues. The rear 02 sensor is not hooked up and will not effect performance in any way shape or form.

 

[Ludachris]

Did you read?

Come on man - is that tone really necessary? The guy is trying to help out. Why do you have to have an attitude? If you want other people who know what they're talking about to help you out in the future, you'll want to show a little more respect and not say things like that.

 

[hereitcomes]

The rear 02 sensor is not hooked up and will not effect performance in any way shape or form.

Ya, but the computer still thinks that it is there...and its not getting a read-out.

 

[DNA666]

Come on man - is that tone really necessary? The guy is trying to help out. Why do you have to have an attitude? If you want other people who know what they're talking about to help you out in the future, you'll want to show a little more respect and not say things like that.

,

If you read my post the 02 was gone long before I decided to put a new one in and the car worked fine. This is something that occured in the 15 minutes it took me to drop the exhaust, hook it back up, and start ther car. Like a part must have crapped out coincidentally at the same time I was doing this.

 

[akdsmer]

This was expected seeing as my 02 sensor bwas pulled out accidentally during my engine swap. My car has ran great since May when this was done and I have been driving with the CEL on since then.

Front O2? Rear O2 sensor?

Fast forward to Monday night when I decide to replace the 02 sensor for emissions testing. I went ahead and dropped the exhaust, replaced the 02 sensor and put the exhaust back up. I go ahead and start the car up and it idles terribly around 200rpms and thick black smoke reeking of fuel is coming out of my exhaust.

Alright, I am guessing by the discription that you just hooked up B1S2 O2 sensor (Post-catalsyt sensor).....

I go ahead and hook the 2nd (after cat) one up and turn the car on. The car idles noticcable better but not good enough. I'm still running rich as hell. I hook the 1st (before cat) one up and it idles even better yet still running way too rich

.


Dude, I thought you already installed the B1S2(post catalyst sensor) Now your going to hook up the first one? Has it been unhooked all this time as well?

The second 02 sensor has been unhooked since May so I would think it has nothing to do with that. I was thinking it's possible I somehow (no idea since it was never touched) broke my 02 at the 02 housing by starting the car with no ground or hooking the new 02 (after the cat) up wrong for a few minutes before unplugginh it. (the wire harness broke so I had tom ake a harness from a molex connector)

The second O2 sensor you tried? another one? or the B1S2 sensor. (post-catalyst, rear sensor, back sensor).


, You don't need to respond to those questions, they simple serve to show that your statements were very unclear. That's typical with this and other forums. I'm used to that, but somehow didn't read through everything and come up with what you meant.

The Sensors are officially labeled B1S1 sensor and B1S2 sensor. That would help clear it up. I still look back and try to put your timeline all together and really can't.

As for trying to tell me what fuel control authority the rear O2 sensor has, please. Fuel injection and emissions/obdII troubleshooting is what I do...and teach. If you are clear, then I can probably help you . You want to come off like an ass because your frustrated.... that's only your problem.

With that said, I hope you got your problem fixed. If you need help, let me know. I'm down in Anchorage about once a month and would still help you out if it really is something weird that you don't get a handle on soon.

By the way, We already have our slick roads. I'm loving it!