Brian Mullins Posted June 22, 2015 Report Share Posted June 22, 2015 Car high Idles only code it gives is P0300 makes no sense to me why the code. Idles at 900 RPM. Someone told me to disconnect battery and touch the cables together to reboot the computer did that with no luck. Is there anything else I can try. Oh yea also shot brake cleaner around the throttle body idles higher but also returns to 900 RPM. Any help would be appreciated. Link to comment Share on other sites More sharing options...
barczy01 Posted June 22, 2015 Report Share Posted June 22, 2015 check for a vacuum leak. Either the plenum boot or the pcv tube on backside of intake manifold near power steering pump. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted June 22, 2015 Report Share Posted June 22, 2015 Is P0300 the only code? I'm thinking IAC motor too. A loose oil filler cap is a vacuum leak, too, as is an oil dipstick that is not pushed all the way in. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
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