Jump to content
CaddyInfo Cadillac Forum

2003 Cadillac Seville

Recommended Posts

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

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


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

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...