FAILED Emissions Test:(...UPDATE

I just thought I would update you guys on my Emissions Test situation...
I knew right after I had failed this past Friday that I chose the WRONG place to go!! They were rude, moronic, and were so much better
than me that they didn't even look up at me while they were talking!!
So I called around today to find a place that actually CARED and LISTENED to what I was saying...and were at least POLITE in someway!
And I found a really awsome place with a great guy working there...he made me feel at ease after just talking to him over the phone!! He asked me what my failing "numbers" were and he said he shouldn't have a problem bringing them down to at least a pass...I thought "oh my God, this guy CARES!"
Anyways, I told him everything that had been done and what not...we also talked a little techy because I know my 2.8/3.1L engines as well as any of you guys:)...I told him what I thought might be the problem etc...and he told me...he also contradicted a lot of what the other moron told me on Friday!
The only thing I kind of regret now is that I think I came across as being more in a position of just wanting to Pass, rather than really looking to solve some big problem. I guess I can see why he may have thought that.
He called me a few hours later and said he "got it to pass". Which tells me that he was really just doing what it took to Pass it for me and not really focusing in on major diagnostic stuff. Needless to say I was VERY happy!!!
He told me that he checked the entire engine for vacuum leaks and found none. He told me he cleaned the throttle body. Then he told me that he noticed that the O2 Sensor was not "switching at idle"(Rich to Lean to Rich etc.)...even though the O2 Sensor is brand-New...so he said he cleaned the electrical connector for it and was able to get working better. He said the car ran better with the O2 Sensor disconnected!!!
He said the engine is not mis-firing, which I thought it was!? He said pretty much everything else looked good except for that O2 thing. He thinks that the O2 circuit might be faulty and that the fault lies in the ECM itself. He told me that the ECM in my car is WELL known for it's poor soldering contacts etc.(which I already knew because of this site). He said he has had to replace TONS of the GM model 1227727 computers.
Anyways, my numbers aren't THAT much better...but at least I Passed!!
Here's my OLD numbers:
40 km/h HC ppm = 69(Limit), 68(Mine) = PASS CO% = 0.38(Limit), 0.04(Mine) = PASS NO ppm = 777(Limit), 621(Mine) = PASS
Curb Idle HC ppm = 200(Limit), 221(Mine) = FAIL CO% = 1.0(Limit), 0.63(Mine) = PASS
And my NEW:
40 km/h HC ppm = 69(Limit), 62(Mine) = PASS CO% = 0.38(Limit), 0.04(Mine) = PASS NO ppm = 777(Limit), 620(Mine) = PASS
Curb Idle HC ppm = 200(Limit), 171(Mine) = PASS CO% = 1.0(Limit), 0.16(Mine) = PASS
As you can plainly see, the 40 km/h results are almost the EXACT same as they were on Friday. But the Idle results are MUCH better.
The car itself acts pretty much the same as before it went in. I'm thinking that since the ECM is original, I might as well replace it anyway.
BUT, here's something I don't understand: The O2 Sensor is independent and not CONTROLLED by the ECM, so if a brand-new O2 is sticking "RICH" and not switching from Rich to Lean as quickly as it should, how can the ECM be to blame? The O2 is just a feedback sensor, correct? OR, do they share the same ground wiring or something? I'm just confused as to how a faulty ECM can cause an O2 Sensor to give false readings?
THANKS AGAIN!:)
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bigbossfan80 wrote:


1227727? Is this an 86-88 Fiero V6 by chance?
JazzMan
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bigbossfan80 wrote in alt.autos.gm

The new sensor could be bad, new parts don't always work as they should, that is why there are warranties. If new parts never failed then there would be no need for manufacturers to use warranties. However, the O2 sensor could be ok, but the ecm is not reading it properly.
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All indications are that your car is feeding too much gas thru the system. The O2 sensor is probably telling you the truth. It is sensing a rich condition. This can be caused by many factors and will in time burn out the catalytic converter. The good guy did what you wanted and got it passed but in the long run did you a disservice by not analyzing the problem and fixing it. When the readings are that close to passing sometimes testing it on a different machine will pass it. It is time to get off your know it all horse and fix the problem. You have a year to the next inspection to fix the real problem.

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