Failed Emissions - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-12-2008, 03:15 PM   #11
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Thanks for doing the research Peter, pricing is great although I wonder about brokerage fees which I'm sure would be a given?


I phoned Napa and the pricing is around $12.00 plus tax, have you used it in yours?
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Old 04-12-2008, 03:52 PM   #12
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I've done it to both my Bonnies. Consider yourself mosquito control when you do this...and do it at night when people will just think its a toxic fog instead of smoke
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Old 04-12-2008, 05:49 PM   #13
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NO. my o2 sensor did not throw a code my engine was running lean and the o2 sensor was the first thing i was going to check when i realized that someone had cut and spliced the wires back together, and as far as i know they give incorrect readings after there has been a break in the wire. either way solved my problem so it was just a suggestion.
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Old 04-12-2008, 06:08 PM   #14
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Quote:
Originally Posted by sandrock
I've done it to both my Bonnies. Consider yourself mosquito control when you do this...and do it at night when people will just think its a toxic fog instead of smoke
YES!!! That'* true

I just did it to my truck the other day.

Kinda boring but here I'm puring it in the brake booster line.


here'* the ride after letting it sit in the engine for about 20 minutes.
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Old 04-12-2008, 06:37 PM   #15
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I've picked up Seafoam, throttle body and fuel injection cleaner as well as a pcv valve at Napa. Napa and Parts Source in Canada don't carry A/C Delco O2 sensors therefore I'll have to call around tomorrow to find who does. In the mean time I'm going to put the old O2 sensor back in as well as the old plugs and run Seafoam, throttle body cleaner as well as the fuel injection cleaner in the tank. I'm still not sure what to do with the Cat since it would be a shame to replace it if nothing is wrong with the existing one.

I'll keep you posted and thanks.
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Old 04-12-2008, 07:02 PM   #16
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You can probably sell your old cat for more than it costs to buy a new one
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Old 04-12-2008, 07:09 PM   #17
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HOLD ON!

Dont let the TB cleaner get on the MAF sensor. it can cause that to give bad readings too. I beleave there is a Techinfo on the MAF sensor cleaning.

EDIT; here is the Techinfo.
http://www.bonnevilleclub.com/forum/...e=article&k=64
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Old 04-12-2008, 07:44 PM   #18
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Quote:
Originally Posted by John Deere Boy
You can probably sell your old cat for more than it costs to buy a new one
Cat'* here in Canada aren't cheap I never even tried to price them out yet and the last time I had one priced out installed was about $200.00
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Originally Posted by Peterg22000
Dont let the TB cleaner get on the MAF sensor. it can cause that to give bad readings too
Thanks for the link Peter.
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Old 04-13-2008, 02:21 PM   #19
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Quote:
Originally Posted by Maymybonnieliveforevr
I've picked up Seafoam, throttle body and fuel injection cleaner as well as a pcv valve at Napa. Napa and Parts Source in Canada don't carry A/C Delco O2 sensors therefore I'll have to call around tomorrow to find who does. In the mean time I'm going to put the old O2 sensor back in as well as the old plugs and run Seafoam, throttle body cleaner as well as the fuel injection cleaner in the tank. I'm still not sure what to do with the Cat since it would be a shame to replace it if nothing is wrong with the existing one.

I'll keep you posted and thanks.
Our 95 SE failed last year due to high NOX levels (it'* got 170K). I have a scantool, everything checked out. I had just changed plugs, oil, filters in anticipation of the test, so I was really frustrated. Turns out I had broken off a vacuum hose at the firewall; the one that controls the vents inside. Fortunately someone on the forum told me to look for vacuum leaks. Would be a good thing to check for before replacing expensive parts. Most of the rubber vaccum fittings on our 95SE have started to crack in spots, i replaced as many as I could, the other one I repaired with Heat shrink tubing. So far so good; it passed easily on the retest.
So simple to fix, and yet it'* now on record as a gross polluter.
-sp4149
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Old 04-13-2008, 05:35 PM   #20
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Default Re: Failed Emissions

Quote:
Originally Posted by Maymybonnieliveforevr
97 SSEi with 185,000 miles, everything passed with flying colours except for:

No PPM, Limit is 408 Results were 664 therefore it failed. Test was done at 1417 rpm with stated dilution at 15.1.

Pamphlet states possible problems as:

High NOx on driving Test

- Inoperative or ineffective EGR (Exhaust Gas Recirculation) system
- Excessive lean air/fuel ratio
- Inoperative or missing catalytic converter (three way catalytic)
- Excessive spark advance
- Faulty Thermostatic Air Cleaner (TAC) system
- Engine Deposits (Carbon)
- Engine Mechanical defect(*)

Air cleaner was new and oil & filter just changed at time of test and I couldn't find any visable signs of vacuum leaks or crackes hoses. Car was at operating temperature of 195 F when driven to the test center and engine light was no one nor were there any codes stored.

Plugs from previous owner were A/C irrudium with gap set at 65 and I've since replaced them with NGK gap at 55.

How do you properly visually check or clean the EGR Valve or even the 02 Sensor and any other suggestion on lowering the NO ppm within acceptable levels?

PS. I don't have a scanner available but a fellow member scanned it last week before the test.


Thanks
Thanks for the suggestion sp4149 but I covered that in my first post, see the bold above.


I just finished running Seafoam as per instructions and I noticed smoke out of the exhaust while it was sucking in but after sitting for 20 minutes or so and running it hard there was hardly any smoke at all.

I cleaned out the throttle body as per tech info and put in a bottle of fuel injector cleaner, any other suggestions?
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