84' Caddy idles really high, 4.1
 

hey peeps. i thought i was pretty good at troubleshooting and fixing **** worng with the good ole 4.1 caddy engine.... this problem is ****in making me crazy. The problem is the engine idles really high as if it were really cold out and stays that way, while driving around still idles high. even though the engine is warmed up it still idles high. I changed out the idle speed adjustment plunger on the TB and the engine coolant sensor. I unplugged the throttle postion sensor and it still idles high, i unplugged the MAP sensor and it still does it. I reset the computer after installing the new sesor and idle speed plunger and it still idles high. The OBD trouble codes are 17, 22, 27, and the dreaded 52.

Has anyone else had a problem like this before? What was wrong with the car? Before the newbies chime in I checked the obvious, the throttle does not stick, there are no cables keeping it open, nothing in the TB keeping it open and the new plunger has been adjusted to the same length as the old one. Thanks for your help in advance.

RE: 84' Caddy idles really high, 4.1
 

P017 (E017) ........................................... Left Oxygen Sensor not ready
P022 (E022) .................................................. Open TPS Signal [VCC]
P027 (E027) ............................................ Open throttle signal switch
P052 (E052) .................................................. ..... PCM Memory Reset

Seem like most of your problem are TPS=throttle position sensor code 22, 27
Check for lose wires or bad sensor.