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  #1  
Old 11-06-2010, 11:34 AM
ellis479 ellis479 is offline
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Cool Buick Ultra Service Engine Light

Hello,

I have a 2003 Buick Ultra with the 3.8 supercharged engine. I'v been having an issue with the service engine light. My OBD tool shows an emmissions system alarm which covers a lot of territory. I changed the gas cap and it worked for a while then failed, so I tried an OEM gas cap. This worked for a while, now it comes on for a day or two and goes off about one a week. This is probably a very small, simple problem, but the yellow light sure bugs me! Could an O2 sensor cause this type of alarm? This engine has about 90,000 miles. Any suggestions............Thanks ellis479
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Old 11-06-2010, 12:13 PM
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Re: Buick Ultra Service Engine Light

You need to give us a P0XXX code so the issue can be narrowed down somewhat. If your scanner is not capable of displaying codes, take it to Advance Auto, or AZ for a free scan.
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Old 11-06-2010, 05:04 PM
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Cool Re: Buick Ultra Service Engine Light

Right now it is not displaying a check engine light. the last two times I checked it when light was on, it displayed DTC PO 440 Evaporative Emission System. I have a pretty nice OBD tool it is an Innova 3100, it shows a wide variety of DTC's. Thanks Ellis
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Old 11-06-2010, 11:42 PM
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Re: Buick Ultra Service Engine Light

Sounds like a small vacuum leak somewhere. These can be hard to find without performing a smoke test.
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Old 11-07-2010, 09:10 AM
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Cool Re: Buick Ultra Service Engine Light

HotZ28,

How do you run a smoke test, and where would be a good place to start looking?? thanks ellis479
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Old 11-07-2010, 10:20 AM
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Re: Buick Ultra Service Engine Light

Quote:
Originally Posted by ellis479 View Post
HotZ28,

How do you run a smoke test, and where would be a good place to start looking?? thanks ellis479
Most emission repair shops use one of these, or a similar brand.
http://www.youtube.com/watch?v=ozs2lf70Buc
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Old 11-08-2010, 05:33 PM
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Re: Buick Ultra Service Engine Light

Hello,
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Old 11-08-2010, 05:34 PM
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Cool Re: Buick Ultra Service Engine Light

Problem has been solved, small leak, Thanks for your help.....ellis479
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