dhs2001 Posted August 3, 2006 Report Share Posted August 3, 2006 My 2001 DHS started idling rough after I replaced the battery. I did the re-learn idle procedure, but that didn't help. When the enging is cold, it idles ok, then after it warms up and I get up to about 45 and something seems to 'kick in' and hold the rpm at about 15-1800, enough to cruise at 55 PMH. The codes indicate MAF problems, but I've replaced that. When I slow down, I have to brake hard to stop, then the idle hovers around 1k. If I rev the engine while in park, sometimes it hangs at 30-3500 and I have to shut the engine off. I hear what sounds like a vacuum leak and have used contact spray to try and locate it. Checked all hoses - no leaks. Any suggestions - besides taking it to a mechanic (my last resort). Thanks! Link to comment Share on other sites More sharing options...
Logan Posted August 3, 2006 Report Share Posted August 3, 2006 On my 2001....there is a rubber boot between the throttle body and the intake...its kind of goofy...mine had a split in it. Intake has to come off to replace. Logan Diagnostic LLC www.airbagcrash.com www.ledfix.com www.ledfix.com/yukontaillightrepair.html www.ledfix.com/ledreplacements.html www.ledfix.com/j42385toolrental.html Link to comment Share on other sites More sharing options...
Ranger Posted August 3, 2006 Report Share Posted August 3, 2006 Welcome. Have you ever cleaned the TB? Might just be a carbon build up hanging up the throttle plate. Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 3, 2006 Report Share Posted August 3, 2006 When Logan had that problem I had saved the photo, here is the photo of the boot location, Mike Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
dhs2001 Posted August 3, 2006 Author Report Share Posted August 3, 2006 Welcome. Have you ever cleaned the TB? Might just be a carbon build up hanging up the throttle plate. Looks like it comes off with two phillips head scews. Anything to look for when re-installing? On my 2001....there is a rubber boot between the throttle body and the intake...its kind of goofy...mine had a split in it. Intake has to come off to replace. I think mine is okay. When I sprayed it with the engine running there wasn't any change in rpm or sputtering.. Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 3, 2006 Report Share Posted August 3, 2006 Welcome. Have you ever cleaned the TB? Might just be a carbon build up hanging up the throttle plate. Looks like it comes off with two phillips head scews. Anything to look for when re-installing? What comes off with two phillips head screws? The throttle body (TB) is a little more complex to remove than that. Are you speaking of the collar between the TB and the intake? If its not cracked no need to remove it.. You can clean your TB with GM upper engine cleaner and a tooth brush or detail brush, open the TB and clean the throat where the plate contacts, the back of the plate and the edges of the plate. Take your time, it is probably gummed up.. I have used a terry cloth rag dipped in the cleaner wrapped around my fingers also... Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
dhs2001 Posted August 4, 2006 Author Report Share Posted August 4, 2006 Welcome. Have you ever cleaned the TB? Might just be a carbon build up hanging up the throttle plate. Looks like it comes off with two phillips head scews. Anything to look for when re-installing? What comes off with two phillips head screws? The throttle body (TB) is a little more complex to remove than that. Are you speaking of the collar between the TB and the intake? If its not cracked no need to remove it.. You can clean your TB with GM upper engine cleaner and a tooth brush or detail brush, open the TB and clean the throat where the plate contacts, the back of the plate and the edges of the plate. Take your time, it is probably gummed up.. I have used a terry cloth rag dipped in the cleaner wrapped around my fingers also... I was thinking of the 'Throttle Positioning Sensor. Link to comment Share on other sites More sharing options...
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