gthompson6 Posted May 10, 2008 Report Share Posted May 10, 2008 My 99 STS began stalling on occasion some months ago, but not enough to worry about. Of course it got worse to the point that it had to be dealt with. Basically the car stalls when under no throttle, usually stopped at idle. I have thoroughly cleaned the throttle body and have replaced the IAC, and still have the problem. Any ideas ? Link to comment Share on other sites More sharing options...
BodybyFisher Posted May 10, 2008 Report Share Posted May 10, 2008 Have you checked for codes? This might be a crank sensor, does it start right up? 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...
gthompson6 Posted May 10, 2008 Author Report Share Posted May 10, 2008 Have you checked for codes? This might be a crank sensor, does it start right up? Always starts right up, no problem. As a matter of fact, stalling does not occur until vehicle reaches normal operating temperature. Link to comment Share on other sites More sharing options...
JimD Posted May 10, 2008 Report Share Posted May 10, 2008 My '98 acted that way before I got under there and cleaned up the connectors on both crankshaft position sensors. Have not had a random stall in 3 or 4 years. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
gthompson6 Posted May 10, 2008 Author Report Share Posted May 10, 2008 My '98 acted that way before I got under there and cleaned up the connectors on both crankshaft position sensors. Have not had a random stall in 3 or 4 years. Where are they located ? Are they easy to access ? Link to comment Share on other sites More sharing options...
JimD Posted May 10, 2008 Report Share Posted May 10, 2008 Located on the left or front face of the block. One slightly above and one slightly below the crankshaft centerline. From underneath I removed the bottom trim panel, oil filter, and oil filter adapter to make enough room to get my hands in there. Not too bad a DIY job. If I had to pay someone to do it, I would have them install new sensors as insurance. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
gthompson6 Posted May 10, 2008 Author Report Share Posted May 10, 2008 Located on the left or front face of the block. One slightly above and one slightly below the crankshaft centerline. From underneath I removed the bottom trim panel, oil filter, and oil filter adapter to make enough room to get my hands in there. Not too bad a DIY job. If I had to pay someone to do it, I would have them install new sensors as insurance. Sounds like the oil should be drained first. What do you think, 2 hr job ? Link to comment Share on other sites More sharing options...
JimD Posted May 10, 2008 Report Share Posted May 10, 2008 No need to drain the oil. I advise you purchase two new O rings for the oil filter adapter. Using 1/4" drive tools will make for a little more room. Two hours for the first time effort is plenty of time. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
gthompson6 Posted May 10, 2008 Author Report Share Posted May 10, 2008 No need to drain the oil. I advise you purchase two new O rings for the oil filter adapter. Using 1/4" drive tools will make for a little more room. Two hours for the first time effort is plenty of time. Many thanks for the advice. I'll give it a shot. Link to comment Share on other sites More sharing options...
Golfer Posted May 10, 2008 Report Share Posted May 10, 2008 No need to drain the oil. I advise you purchase two new O rings for the oil filter adapter. Using 1/4" drive tools will make for a little more room. Two hours for the first time effort is plenty of time. Many thanks for the advice. I'll give it a shot. I had the same problem on my 99 STS a couple of monthes ago. The service station replaced the CPS's but it turned out to be the ignition switch. That being replaced everything was OK. I also replaced the battery as it was the original and didn't owe me anything. Ron Link to comment Share on other sites More sharing options...
gthompson6 Posted May 11, 2008 Author Report Share Posted May 11, 2008 My '98 acted that way before I got under there and cleaned up the connectors on both crankshaft position sensors. Have not had a random stall in 3 or 4 years. I forgot to ask. Did you pull the sensors or leave them in and clean the connectors ? And how did you clean them ? Link to comment Share on other sites More sharing options...
BodybyFisher Posted May 11, 2008 Report Share Posted May 11, 2008 It is possible that JimD does not have electricity based on the news I am seeing on TV, with 85,000 people without power. I would say to leave the sensors in place and just clean the connectors and contacts. Buy electrical contact cleaner from the auto store. 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...
gthompson6 Posted May 11, 2008 Author Report Share Posted May 11, 2008 It is possible that JimD does not have electricity based on the news I am seeing on TV, with 85,000 people without power. I would say to leave the sensors in place and just clean the connectors and contacts. Buy electrical contact cleaner from the auto store. Thanks BBF. Hope everythings OK with JimD Link to comment Share on other sites More sharing options...
JimD Posted May 11, 2008 Report Share Posted May 11, 2008 I'm cool. Comcast and wet weather is not a good combination. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
Bill K Posted May 12, 2008 Report Share Posted May 12, 2008 With mine, the stalling problem was cured by a new EGR valve. Good luck..... Link to comment Share on other sites More sharing options...
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