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Thread: Burb fails smog check
10-09-2007, 08:12 AM #1
Burb fails smog check
The burb failed its smog test yesterday. CO levels were a tad high. Took it to a test only station and besides the CO, the gas cap did not pass either. I thought I'd start with cleaning the K&N and a fresh set of plugs. Any suggestions?There is no way to happiness....happiness is the way.:yipi:
High Desert SoCal
93 K1500 burb (personal) 350 AT 3" Lift 250K+
02 Honda Civic LX
Looking for a 1990's Miata for an engine swap
10-09-2007, 08:23 AM #2
Did you drive it at least a half hour before the smog test was done?
If you did not it may have still been in the start up mode. High fuel or whatever it’s called. I know when we lived in Taxachusetts if the vehicle wasn’t warmed up it would never pass.
Technology is great, when it Works,
And one Big Pain in the Ass When it Doesn’t.
Detroit Iron Rules, All the Rest are Just Toys.
94 GMC Burban, 5.7L (350), 4X4, Auto
86 GMC Burban, 350, 2 WD, Auto
79 GMC pickup plow truck, 400, Full time 4X4, Auto
86 Pontiac Fiero SE, 2.8L, Auto, only mid engine American car
See a Pattern yet?
15 year GM assembly line worker.
10-09-2007, 09:44 AM #3
Try running some fuel injector cleaner/engine treatment through it. If you had failed on NOx then I would have suggested EGR or Cat, but CO just sounds like it is dirty somewhere. And as Fiero said, warm it up real nice. Good luck.Gary
99 K 1500 Suburban
78 Silverado Big 10 w/factory 454
00 S-10 Blazer
1976 Trans Am
1980 Honda CB900 Custom
10-09-2007, 07:24 PM #4
Cool, I'll give it a try. Stay tuned for test#2 results.
10-22-2007, 08:56 AM #5
New plugs and air filter. Dumped a can of seafoam in the tank and going for a retest today. Plugs 1 & 3 showed signs of wear. Hope for the best.
10-22-2007, 09:01 AM #6
Good luck! Don't forget about 10 mile tour at freeway speeds then go right in to be tested. Don't shut it off when you get there.
2007 Ford E250(Work van) (Ya, Ya, shut up!)
1996 GMC Sierra SLE 1500 5.7L/4L60E
10-22-2007, 09:42 PM #7
Failed test #2. The 1st tech was a tard! The second tech spotted it right away. Bad cat! Quoted $140 for a cat or $340 for cat and a cat back system with a Magnaflow and 3" pipe with the mandatory chrome tip. Went for the whole package and the 3rd test passed! Whoopee
Sounds mellow enough too. Can't wait for the Cajon Pass climbing test to see if there are any extra benefits in the HP department.
10-23-2007, 12:27 AM #8
Plugged cat? Well I'll be damned. I'm surprised you didn't feel that earlier...? Anyway good for you, an unexpected upgrade.
10-23-2007, 09:35 AM #9
Howard's Muffler quoted me a fair price and got the job done the same day!
10-23-2007, 10:29 AM #10
See, I told you so!! I have the Magnaflow catback on my 99 and love it. Nice mellow tone and a few more ponies pushing it.
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