Chrysler Repair: 1994 Chrysler Concorde hesitating, powertrain control module, side exhaust manifold

Question
Hesitates at anytime and any speed. Did this for 2-3 weeks before occasionally stalling completely. Takes 5-10 minutes to restart. Can save from stalling if I can get the RPMS up on motor. Cruise control light will flash simuntanously also. Cam and crank sensor, intake gaskets, spark plugs and wires have all be replaced.

Codes I get are either 3, 5, 5. OR 1, 2, 5, 5


Answer
Hi Luke,
No doubt it was a 12, 55. The 55 means 'end of readout'. The 12 means the voltage to the powertrain control module was disconnected sometime in the past 50-100 key starts. If the battery hasn't been disconnected that recently, then I would check the clamps and posts at the battery and the grounding condition at the far end of the wires that are attached to the - post clamp.
The other thing to check would be the egr valve to see if it might be sticking ajar instead of closing tightly at idle and when you accelerate. That would cause poor idle, hard starting, and hesitation. The exhaust gas recirculation valve is located behind the engine near the air intake throttle valve. It is mounted in a pipe that runs between passenger side exhaust manifold and the air intake manifold. The valve is mounted horizontally and has a valve stem between its round vacuum actuator top and the body of the valve attached to the pipe, inside the flange that connects the two parts. The stem has a slot into which you can insert the tip of a flat-bladed screwdriver so as to lever the stem back and forth against spring action which should move freely and close tightly. If the stem seems to be sticky so that stem doesn't close all the way by spring action, then you can try spraying some penetrating solvent like WD-40 on the valve stem to freeup its motion.
If the valve is sticking slightly ajar it will make for a rough idle and poor acceleration such as you describe because the mixture is too dilute. It is one of the most common causes of this symptom. So see if you can find the valve and check/lubricate the stem. To check it in motion you can rev the engine from idle to 2500 rpm and back to idle and watch to see if the valve stem moves freely in both directions to the extreme open and closed positions. It may be that the interior of the valve is cruddy so that might require that it be unbolted from the pipe where it it attached and cleaned. But chances are good it will only be a sticky stem. Feel free to write back with the results and other questions you might have.
Roland