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Author
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Topic: smog fail...spark plugs?
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CustomFastbackCA
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Member # 1369
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Hey guys,
I just failed my smog check for my 95' M3. I know most people are only familiar with mustangs, but M3 guys don't know much about Nitrous and my car has nitrous. My car passed the 25 MPH test (2800 rpm) and failed the 15 mph (1800) test. I have an NX wet kit. I can't think of anything that would make me fail the test, in terms of my nitrous, except for the colder plugs. Would colder plugs make me fail do to an incomplete combustion process? Any other ideas? It passed the Oxygen sensor test. thanks
David
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www.CustomFastbackCA.com
1995 Dinan M3 Avus Blue Metallic
1967 GT Mustang Fastback (Eleanor)
Ask questions if you have'em, anyone who thinks they're too cool, know's it all, or doesn't want to look stupid has more problems than you.
Posts: 346 | From: Santa Clara | Registered: Jun 2002
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S351-R
CAFords OG
Member # 1605
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posted
What did you fail on? HC (hydrocarbons)? CO (carbon monoxide)? NOX (nitrogen oxide)? Or a combintation of the three?
[ January 08, 2005, 09:15 PM: Message edited by: SALEENx5 ]
Posts: 344 | From: Earth | Registered: Jul 2002
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CDT
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Member # 5004
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posted
what emission did it fail on???
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Custom Dyno Tuning
510.331.0608
Home of Flat Fee Tuning For All Cars, Trucks and SUV's, EFI & Carb, SCT, AFR, Dynatech, STS Turbos, N2O Refills
Posts: 1053 | From: Hayward | Registered: Nov 2004
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CustomFastbackCA
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Member # 1369
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posted
It failed on all three, but barely on CO%. The max for HC was 85 and I measured 181. The max for CO was %.50 and I measured %.51. The max for NO was 695 and I measured 1716. I passed with flying colors on the 25mph test, except for HC was pretty close to failing.
Posts: 346 | From: Santa Clara | Registered: Jun 2002
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CustomFastbackCA
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Member # 1369
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posted
Oh yeah, and the car has 119,000 miles with original cats. I was thinking about changing the plugs, puttin' in some fuel additive, and then heatin' up the cats.
Posts: 346 | From: Santa Clara | Registered: Jun 2002
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95 stang
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Member # 3449
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posted
does it have an egr?
Posts: 42 | From: bay area | Registered: Oct 2003
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CDT
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Member # 5004
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posted
whens the last time you changed the O2 sensor?
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Custom Dyno Tuning
510.331.0608
Home of Flat Fee Tuning For All Cars, Trucks and SUV's, EFI & Carb, SCT, AFR, Dynatech, STS Turbos, N2O Refills
Posts: 1053 | From: Hayward | Registered: Nov 2004
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CustomFastbackCA
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Member # 1369
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posted
yeah.
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www.CustomFastbackCA.com
1995 Dinan M3 Avus Blue Metallic
1967 GT Mustang Fastback (Eleanor)
Ask questions if you have'em, anyone who thinks they're too cool, know's it all, or doesn't want to look stupid has more problems than you.
Posts: 346 | From: Santa Clara | Registered: Jun 2002
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CDT
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Member # 5004
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posted
the NOX failure is probably your EGR system not working
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Custom Dyno Tuning
510.331.0608
Home of Flat Fee Tuning For All Cars, Trucks and SUV's, EFI & Carb, SCT, AFR, Dynatech, STS Turbos, N2O Refills
Posts: 1053 | From: Hayward | Registered: Nov 2004
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CustomFastbackCA
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Member # 1369
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posted
Ok. Don't know if the 0 sensor has ever been changed.
Do you think I could just clean out the EGR tube or would you think a new unit is in hand?
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www.CustomFastbackCA.com
1995 Dinan M3 Avus Blue Metallic
1967 GT Mustang Fastback (Eleanor)
Ask questions if you have'em, anyone who thinks they're too cool, know's it all, or doesn't want to look stupid has more problems than you.
Posts: 346 | From: Santa Clara | Registered: Jun 2002
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CDT
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Member # 5004
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posted
you have to check the system and see what part is not working, it could be the valve needs to be replaced, or the passages clogged or the vacuum solinoid doesnt work.. O2's should be changed at least every 50k miles
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Custom Dyno Tuning
510.331.0608
Home of Flat Fee Tuning For All Cars, Trucks and SUV's, EFI & Carb, SCT, AFR, Dynatech, STS Turbos, N2O Refills
Posts: 1053 | From: Hayward | Registered: Nov 2004
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S351-R
CAFords OG
Member # 1605
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posted
quote:
Originally posted by CustomFastbackCA:
Do you think I could just clean out the EGR tube or would you think a new unit is in hand?
Your BMW M3 does not use an EGR system.
Posts: 344 | From: Earth | Registered: Jul 2002
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99gt-UJSTLST
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Member # 584
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posted
quote:
Originally posted by CustomFastbackCA:
Hey guys,
I just failed my smog check for my 95' M3. I know most people are only familiar with mustangs, but M3 guys don't know much about Nitrous and my car has nitrous. My car passed the 25 MPH test (2800 rpm) and failed the 15 mph (1800) test. I have an NX wet kit. I can't think of anything that would make me fail the test, in terms of my nitrous, except for the colder plugs. Would colder plugs make me fail do to an incomplete combustion process? Any other ideas? It passed the Oxygen sensor test. thanks
David
I would change out the spark plugs, your sprak might be to weak at lower RPM's wich would couse you not not burn the fuel completely,
take it to a shop that has pass or dont pay, its worth a try, Their is a smog shop by my house that does pass or dont pay.
hey hows ellenor comeing out.
[ January 09, 2005, 07:47 PM: Message edited by: 99gt-UJSTLST ]
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SOUTH BAY STANGS
MINOR BOLT ON'S
www.southbaystangs.com
Posts: 2558 | From: SAN JOSE CA | Registered: Nov 2001
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