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CA smog question
Question...I have a 1987 911 with a stock 3.2 and around 160000 miles on the engine, Topend redone at 110000.
Due for smog in 2013. Question regarding the NO (PPM) measurements. As you can see the CA standards are getting tougher in that department. My 911 is also gaining points there. What can I do to get this number down in the future as I feel this will be where I fail. Is that number the one for the NO(PPM) directly related to my cat? Will a new CA cat lower this number? First test from 2008 the second from 2011. All my other measurements look good though. Thanks Brad F  
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02-22-2012, 08:28 PM
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Its been my experience that high NO means your engine is running too hot in the combustion chambers. This can be caused by a vacuum leak of some sorts.
Check all your vacuum hoses and your intake runner gaskets.
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"A good sense of humor is the best thing to have in your toolbox when working on these cars." Quote by Charles Freeborn, Pelican. |
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02-22-2012, 08:56 PM
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Join Date: Mar 2005
Location: Northern CA
Posts: 4,703
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what someone should do is sue CARB for lowering the cutpoints - if all here would send in $100 we could probably get a good lawyer for a period of time
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Sold: 1989 3.2 coupe, 112k miles |
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02-23-2012, 06:28 AM
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Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
Posts: 5,238
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Smog Test Parameters
Quote:
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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02-23-2012, 07:14 AM
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Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,350
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"Its been my experience that high NO means your engine is running too hot in the combustion chambers."
And/or too much ignition timing advance, e.g. a so-called 'performance' chip.
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Have Fun Loren Systems Consulting Automotive Electronics '88 911 3.2 '04 GSXR1000 '01 Ducati 996 '03 BMW BCR - Gone |
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02-23-2012, 07:47 AM
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Join Date: Feb 2007
Location: Tustin. CA
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Just had a friends '87 fail for NO. A tune up with new cap/rotor, plugs, valve adjust and oil change didn't help.
A new Cat. solved the problem. His car is 150k+ miles. The other smog numbers were ok. The new Cat. really cleaned everything up. Super low #s across the board. Cooper |
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02-23-2012, 11:43 AM
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Join Date: Dec 2010
Location: LOS ANGELES,CA,USA
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I had a same problem about a month ago. NO way to high. My ignition timing was out of spec(to advanced). Once the timing was set up properly, i passed..even without O2 beign connected.
I would start with the cheap stuff, ignition timing , tune up, check for vacumm leaks, then move on to cats.. Good Luck! |
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02-23-2012, 12:19 PM
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Good to know. I'm due for a smog test in the next month. Thanks
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2007 Cayman 1986 Carrera coupe (sold) 1979 911 SC targa (sold) |
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02-23-2012, 01:48 PM
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Quote:
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Sold: 1989 3.2 coupe, 112k miles |
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02-23-2012, 02:02 PM
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thanks for all in input!
Brad F |
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02-23-2012, 03:21 PM
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1987 Porsche 911
Gretchen
