Welcome Visitor! Please take a few seconds and KYRangerDude
Well-Known Member
Just ran a KOER check and only code I got was a 12: RPM at idle out of range/high. Any ideas on where to start resolving this? Passed KOEO , passed continuous memory, output state check (relays & solenoids) and passed wiggle test. 2.9L on a 92 4x4 Ranger. As stated in earlier posts, sucker idles rough at startup then smoothes out after warmup. Could be related? I've checked MAP, IAC, vacuum lines. At a loss of where to go next. I don't know what controls rpm idle nor how to adjust (if possible).
