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Registered
Join Date: Jun 2009
Location: Los Angeles
Posts: 86
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failed smog please help
hey guys failed California smog. the cars has new plugs, o2 sensor, vacuum lines the cats about 4 years old. any help would be appreciated here are the numbers.
1988 944 15mph %co2- 12.7 %o2- 2.3 hc max-83 gp-293 meas- 180 co max-.75 gp-2.25 meas-.60 no max-575 gp-2002 meas-2822 25 mph %co2-13.0 %02-1.9 hc max-65 gp243 meas-58 co max-.63 gp-2.13 meas-.60 no max-738 gp-1802 meas-1410 Im thinking the AFM is way out of adj. Thanks Matt
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1988 944 with early motor 1974 Bronco, 1965 BSA Lightning |
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02-26-2012, 06:50 PM
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That Guy
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High NOx is usually a result of the car running excessively lean. The most common reason for this are vacuum leaks. Second is just a bad cat. Make sure you get the cat very hot before taking the test, drive the car on the highway for a little while and see if you can 'roll right in' off the street for the test.. dont shut the car off or let it cool off.
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Jon 1988 Granite Green 911 3.4L 2005 Arctic Silver 996 GT3 Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1 |
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02-26-2012, 06:59 PM
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Join Date: Jun 2009
Location: Los Angeles
Posts: 86
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Yeah that was after a hour on the fwy and a five min wait for the paperwork then test
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1988 944 with early motor 1974 Bronco, 1965 BSA Lightning |
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02-26-2012, 07:47 PM
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Garage Helper
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Could also be the O2 sensor making it run lean
Could be also the DME temp sensor on the block is defective. Test both...
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78-924 traded for 80-931 traded for 84-944 traded for 85.5-944 (7th one now).  UAV-M1 (Urban Assault Vehicle - Model 1) Bless the lowered, and pass the nitromethane. Pedal to the metal till you see the gates of hell then brake NLA - No longer available is a four letter word |
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02-27-2012, 01:36 AM
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Registered
Join Date: Jun 2009
Location: Los Angeles
Posts: 86
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okay i tested the DME temp sensor and it seems out of spec here are the numbers
@55-57 deg 2.90 k-ohms spec is 3.3 @176 deg 264 ohms spec is 280-360 so lower than specs means leaner but would it be that much of a difference?
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1988 944 with early motor 1974 Bronco, 1965 BSA Lightning |
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02-28-2012, 05:40 PM
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Garage Helper
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The DME temp sensor is not that much money - replace it. It has probably been bad for quite some time now. If you run a 944 motor for to long with to lean of fuel supply you take a good chance of burning the valves.
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78-924 traded for 80-931 traded for 84-944 traded for 85.5-944 (7th one now). UAV-M1 (Urban Assault Vehicle - Model 1) Bless the lowered, and pass the nitromethane. Pedal to the metal till you see the gates of hell then brake NLA - No longer available is a four letter word |
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02-28-2012, 08:46 PM
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The fan of CAPS LOCK has passed his smog. He cheated but he passed.
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02-29-2012, 06:47 AM
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The Kraut Burner
The Bratwurst Burner
Das Boost
ORACLE
948
OG 948
