91 Olds runs great but don't turn it off

[theodorep]

Folks, I have 1 91 Olds Cutless Ciera with 3.3, auto, 250K, AC. The car runs great, starts fine, good performance. If I run it for 8 hours it will run problem free. However, if I turn it off, and try to restart it, it will, but it will run very rough, the check engine light comes on and it will stall. If I wait for about 2 hours or more, it will start fine, run great, and no Check Engine.

The codes I pulled today were 42 and 44. Appreciate the help.

[maxwedge]

Have the ign. module tested for starters, it may pass though as your condition is heat related and the test may show good.

[JohnDD]

Originally Posted by theodorep

Folks, I have 1 91 Olds Cutless Ciera with 3.3, auto, 250K, AC. The car runs great, starts fine, good performance. If I run it for 8 hours it will run problem free. However, if I turn it off, and try to restart it, it will, but it will run very rough, the check engine light comes on and it will stall. If I wait for about 2 hours or more, it will start fine, run great, and no Check Engine.

The codes I pulled today were 42 and 44. Appreciate the help.

Code 42 is Electronic Spark Timing (EST) Circuit. Could be poor connections in cct 423 (white) or circuit 424 (tan/blk) wires between ECM and Ignition Module.

Code 44 is Oxygen Sensor Cirucuit (Lean Exhaust Indicated).