1987 Firebird, 305 V*, 4 barrel carburetor, automatic transmission, California Emission equipped.I hope this is readable and not too long. I replaced almost everything between 1999 and 2001 (5000 mi ago) and still it won't pass, even used Denatured Alcohol for the last test.
Test Mileage %CO2 %O2 HC (PPM) CO (%) NOx (PPM)
Date Test RPM Meas Meas Max Ave GP Meas Max Ave GP Meas Max Ave GP Meas Results
11/20/99 Wayne's Automotive 82814.00 15 mph 1300 12.7 2.8 135 285 203 0.71 2.21 0.35 1465 1965 4143 G POL
Pretest ** 25 mph 1276 12.8 2.7 85 235 168 0.59 2.09 0.27 1265 1765 3835 G POL
11/26/99 M&D Automotive 82870.00 15 mph 1885 12.8 2.7 135 30 63 0.71 0.14 1465 206 563 Pass
Pretest 25 mph 1586 12.9 2.4 85 12 60 0.59 0.07 0.44 1265 194 374 Pass
11/27/99 BP Immanuel Auto 82887.00 15 mph 1779 12.1 3.0 135 30 87 0.71 0.14 0.68 1465 206 518 Pass
Test Only & GP station 25 mph 1607 12.4 2.4 85 12 80 0.59 0.07 0.57 1265 194 236 Pass
11/13/01 Wayne's Automotive 88181.00 15 mph 1280 13.9 0.9 110 30 134 0.71 0.14 0.42 1025 206 1791 Fail
Pretest 25 mph 1265 14.1 0.9 85 12 113 0.59 0.07 0.29 885 194 1611 Fail
11/13/01 Quick Smog-test only 88188.00 15 mph 1835 14.0 1.2 110 285 128 0.71 2.21 0.41 1025 1965 1959 Fail
Pretest 25 mph 1229 14.1 1.0 85 235 166 0.59 2.09 0.57 885 1765 2506 G POL
11/16/01 Quick Smog-test only 88207.00 15 mph 1783 14.1 0.9 110 30 100 0.71 0.14 0.41 1025 206 884 Pass
Test 25 mph 1206 14.0 0.5 85 12 105 0.59 0.07 1.03 885 194 1010 Fail
11/24/01 Purrfect Auto Service #2 88272.00 15 mph 1290 12.9 0.3 110 285 190 0.71 2.21 2.76 1025 1965 656 G POL
Test 25 mph 1249 13.9 0.8 85 235 161 0.59 2.09 0.32 885 1765 1307 Fail


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86 FB stock 305 Qjet South California emissions

 

Your numbers seem to be kinda hard to sort thru. What did you fail??

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85T/A 305/QJ work in progress.

 

to many numbers. yes what did you fail and what were the measurments.

 

Looks like he is failing HC, nothing else that I can see in that mess.

15 MPH Meas:128 Max:110
25 MPH Meas:166 Max:85

15 MPH Meas:100 Max:110
25 MPH Meas:105 Max:85

15 MPH Meas:190 Max:110
25 MPH Meas:161 Max:85

Seems to be a wide variance in the readings. What were the ambient and engine temps on those tests, anything unusual between the tests?

 

Ok, sorry it took so long but I think this link will straighten out the mess of numbers:
http://www.geocities.com/ritchy_ca/i...1006727271858. Sorry I'm not so good at this yet. Rich

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86 FB stock 305 Qjet South California emissions

 

IS it possible that my oxygen sensor bit the dust after 5,000 miles ?
The car seems to run perfect. Is it the cat ?
I'm tired of throwing parts at it.
Thanks.

 

From the readings, I think your cat is fine. Its either running a little rich (probably not the o2 sensor either) or the timing is off. Check that all the plug wires are on right, and take a look at the balancer and see if it looks like it has slipped.

 

Here in California the station checks the timing. It has to be set to the sticker under the hood, which in my case is 0 degrees. It runs better at 10 degrees. I know that the last mechanic let the car get cold and I think he didn't get it hot enough before he checked it. I also think that the mechanic who diagnosed and adjusted it didn't check the tps voltage. I intend to do that today.And anything else I can before I go to the trouble to replace the cat. Thanks for your input.
Rich

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86 FB stock 305 Qjet South California emissions

 

Your o2 reading isnt high enough for the cat to be bad, unless its clogged, but I doubt it. Either it was too cold to work properly, or the car is just running to rich and it cant clean it up enough. Replacing it wont help.

I live in Cali, I know about the smog tests. Just because they set the timing does not mean its correct. If the balancer slipped and then they set the timing, then your actual timing is wrong. Only way to check that is to check the balancer for obvious movement, otherwise you will have to put the #1 piston at TDC and see if the marks line up.

Since its carbed, you may also want to check that all the vacuum hoses are in the right places and not cracked/leaking.

 

I checked the balancer and the timing b4 I took it in to the 1st mechanic. He checked all the plug wires and vaccum lines. I researched it and found that I rebuilt the carb after the 99 smog. Yesterday I reset the TPS from .6 to .47 volts, lowered the float, and cleared a code 41 (probably from the last smog check where the mechanic couldn't start it, I have a kill switch on the coil and I think he tried to bypass it). Today I am replacing the thermostat and the sensor I broke getting the housing off. Then I might take it in again and see.

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86 FB stock 305 Qjet South California emissions

 

Ok, so I replaced the temp sensor and thermostat, changed the carb hanger from D back to the M and the CH rods it came with, and changed the purge solenoid. Still have the 3 to 1 ratio denatured alcohol and 87 octane mix, checked the charcoal canister-is dry, am replacing worn hoses going to it, and it still won't pass. The numbers are better but now instead of high HC and CO, I am high NOx. Max at 15/25 mph is 1025/85 and I did 1500/1215 last time I did 656/1307 and the time before I did 884/1010. Any suggestions ?

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86 FB stock 305 Qjet South California emissions

 

I take it you have a 3 way cat? High nox is usually the cat. If the air injection (divertor valve etc.) isn't injecting air into the 3 way cat that would do it. Good luck-with tpi it's easier for me, but I know about the PIA Ca. smog.....



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86 406

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

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86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

------------------
86 FB stock 305 Qjet South California emissions

 

Well, after 5 smog check failures I've decided to see if the BAR's comsumer assistance program will (can ??) fix it.I've replaced everything but the cat and carb. Thanks for your help everyone !

 

So now the info gets faxed from the mechanic to the state to see if the state will allow them to fix the problems.