Questioni have a 93 Cadillac STS Seville Northstar 4.6 that i recently purchased a week ago. I am starting to remember why i got rid of my last cadillac (91 cadillac deville)..
Anyways once i start the car & it warms up for awhile the idle starts jumping up & down, and during driving the "check engine soon" light comes on and goes back off a few times, shortly after a few times on going on & off it stalls in the middle of driving. It does however start right back up when i turn the key. At first my mechanic said it sounded like a vaccum leak under the big aluminum plate, he checked the gasket under the plate & said that it looked fine, & looked for any vacuum hoses unplugged & found 1 unplugged, fixed that & my mpg went from 10.9 to 14.5 .. So im saving on gas now, but still having the idleing up & down and the stalling. I ran the diagnostic codes and they were as follows: P23.. P25.. P52.. P57.. P83.. P109.. P48.. & P24. So after running that diagnostic and recieving them codes he cleared all of the codes, drove a few blocks, and these are the codes that are comming up now as follows: P23.. P25(current).. P57 (current).. P83.. IO52.. AO48.. 27 (current).. SD44.. SO55
AnswerP023 = Ignition control circuit problem.
P025 = 24x reference signal low.
P057 = Shorted transaxle temp sensor signal.
P083 = 24x reference signal high.
I052 = IPC memory reset indicator.
A048 = Very low refrigerant pressure in AC system.
A027 ??????? = No such code. P027 = Open throttle position
switch.
SD44 = No such code. S044 = Lift/drive signal fault.
S055 = Remote resistor hold side short to ground/open
circuit.
I can provide you with the pictures and test procedures for the CURRENT codes as these are the ones you want to diagnose and fix FIRST. After they are repaired, Clear all the codes and see which ones return.
E-mail me at: onlineautohelp@msn.com and provide your question and year, model, and engine size of vehicle.
