1992 Lexus ES 300 DTC: 28 Trouble

1992 LEXUS ES 300
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STREETKINGZ
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hi i got a 1992 lexus es300 and recently i just got a trouble code scan of DTC: 28 what does that code mean and how can i fix the problem and when i start it it idle high before the MIL came on and the code was on it was running fine and after the code it just start idle high

Can someone help i really need to fix this asap
Jul 17, 2013 at 7:00 PM
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SATURNTECH9
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Are you sure its a 28?The codes go from 27 and the next highest one is 31.
Jul 17, 2013 at 7:07 PM
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STREETKINGZ
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yea on the scan tool it say DTC: 28
Jul 17, 2013 at 7:26 PM
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STREETKINGZ
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maybe because it a lexus or obd1
Jul 17, 2013 at 8:36 PM
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SATURNTECH9
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I looked up a 1992 so its going to be obd1 and the codes go from 27 then the next number is 31 but I will look some more.
Jul 17, 2013 at 9:05 PM
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STREETKINGZ
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i found this on here

https://www.2carpros.com/articles/toyota-trouble-code-definitions-and-code-gathering-method-1990-1995
Jul 17, 2013 at 9:19 PM
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SATURNTECH9
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I see that code for a 1992 Toyota Camry but not the lexus you have.Its for a o2 sensor. Doesnt explain the high idle though.Do you have a V6 engine?
Jul 18, 2013 at 12:18 PM
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STREETKINGZ
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Yes it a v6 and yea it idle high for about 5-10min and then goes back to normal
Jul 19, 2013 at 7:33 AM
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SATURNTECH9
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Have you looked for vacuum leaks yet?
Jul 19, 2013 at 6:13 PM
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STREETKINGZ
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Yea I check that no vaccum leak
Jul 19, 2013 at 6:41 PM
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SATURNTECH9
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How did you look for a vacuum leak with carb spray?The best way is with smoke also have you checked to see if your idle air control valve is sticking?
Jul 19, 2013 at 6:50 PM
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STREETKINGZ
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I check it both way with smoke first and how do u check your idler air control if it sticking
Sep 10, 2013 at 8:35 AM
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SATURNTECH9
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I would remove it see if its carboned up clean it all up.
Sep 10, 2013 at 3:01 PM
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STREETKINGZ
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I did it with smoke
Nov 14, 2013 at 6:16 AM