:confused: OK HERE WE GO. I WAS DRIVING AT MAYBE 70MPH 4 LIKE 5 MINS AND PARKED MY CAR AND THE NEXT DAY IT WOULDNT START! IM NOT THAT MECHANICALLY INCLINED,BUT I HAVE HELP.I REPLACED THE IGNITION COIL WHEN I FIRST GOT IT TO THE ACCEL SUPER COIL.SINCE IT HASNT STARTED I REPLACED THE DISTRIBUTOR AND ROTOR(ACCEL).THE STARTER SWITCH AND CHECKED ALL THE FUSES.I GOT MY STARTER TESTED AND REPLACED MY STARTER SOLENOID.I STILL NEED TO BYPASS THE SOLENOID 4 IT TO EVEN CRANK OVER.I TRY 2 START IT WITH THE KEY AND NOTHING!MY BATTERY DRAINS VERY QUICKLY.THE TROUBLE CODES ARE E90,P23,P24...I GOT A TPS SENSOR ON THERE AND DROVE IT 4 A COUPLE OF DAYS BUT HOW DO U ADJUST IT TO 525 PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!:(

I have had the chip in the key to go bad and cause a no start for no apparent reason. If you carry two different keys together sometimes it will cause the chip to fail or if it gets too close to a magnet. I also have had the ignition switch to fail where the key chip makes contact with the key and cause a no start. If you have a spare ket try it and also lock and unlock your driver's door with a key and see if it starts.

thanx 4 ur help im gonna get someone 2 replace that ignition switch soon if its not that im baffled.i love Caddies but i almost regret getting one ,peace

same exact thing has happened to me except my battery is not draining.the ignition switch was changed out oo and nothing happened still.have you figured it out yet? could use whatever advice you may have gotten,thanks.Blanca