The_Raven Posted October 17, 2006 Report Share Posted October 17, 2006 Howyadoin, Here's a bit of weirdness... Conditions: <30 MPH, off throttle, coasting, usually downhill or level grade. RPM sitting at ~750 RPM, every 4 seconds or so RPM will drop below 500 for about a second, then come back to ~750, then repeat after 4 seconds. Doesn't happen at a stop or in park. Any guesses? ISC motor, dirty throttle butterflies, bad MAF (or is it MAP on a '96?) sensor? O2 sensor? -Rav -Mark P. Salem, MA "Refined Sugar" - '96 SLS, 175K "...the Caddy is dedicated to relentlessly -- and comfortably -- converting time into distance." -J.J. Gertler Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 17, 2006 Report Share Posted October 17, 2006 There is no ISC motor on the 96, that was my first thought also until I saw 96. Try taking out the IAC (Idle Air Control) on the side of the throttle body and cleaning it and its passage. IAC is #1 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...
adallak Posted October 17, 2006 Report Share Posted October 17, 2006 Looks like the air flow is a factor since it does not happen in idle. I would not touch it unless it gets noticeably worse. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
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