Dodge Repair: 93 dodge caravan: rough run when started warm, exhaust gas recirculation valve, exhaust gas recirculation

Question
i have troulbe code 27 injector 6  i replace thr injector same problem   problem is van runs good cold  when i shut it off after
it get to warm engine temp and let it sit for 10mins or so i start it up andf runs rough  loss of power and miss real rough van sit and cools down say after work when  leave runs good  runs good when running just after sitting 10 min runs rough

Answer
Hi Bob,
I wonder whether the problem is the injector, because that should not be temperature-related as you describe. I would suggest that you locate the exhaust gas recirculation valve and try spraying some WD-40 on the valve stem where it enters the body of the valve. If that valve is sticking slightly open when it gets warm then that can cause the sort of problem you describe. The valve is in a small pipe that branches off the exhaust manifold (front on the 3.0L, rear on the 3.3/3.8L). It has a round vacuuum actuated top, the valve body is mounted to the pipe, and between those two parts is a flange inside of which you will see the valve stem which has a slot in it that lets you move the stem back and forth with the tip of a screwdriver. Spray the stem where it enters the body, then move the valve back and forth to be sure it moves freely and that the internal spring-action causes it to close to a dead-stop.
If you believe the problem is the injector for cylinder #6, then you would do well to try wiggling the connector and harness while the engine runs to see if there might be a wiring problem that is causing the code. It can  either be a bad injector OR a problem with the wire that runs from the pcm to the injector.
Are you sure it is injector #6? The 27 code is not specific as to which injector circuit is bad.
Let me know which engine (L) you have and I can tell you the wire connections at the pcm for each injector and you can check those out for continuity using a continuity tester or ohm-meter while gently shaking the wiring harness.
The last possible cause, related to temperature is the coolant temp sensor is not accurate. If you have an ohm-meter you should find that reads around 1,000 ohm when the engine is hot. Otherwise if it reads several thousand ohms when hot then that would cause a poor mixture and rough idle.
Please 'rate' my answer (see below).
Roland