Guys,
I was reading another post that i found on the site an it sounds alot like my problem. I have listed below for your reference. I have a few differences, but mostly the same. Here it is. http://autoforums.carjunky.com/Automotive_Repair_C1/Electrical_and_Wiring_F6/Dodge_Caravan_Injector_hell_P50742/ .
Before i go any further i should tell you the circustance with which this started. I stopped and filled up my car at the gas station, and started on an hour long trip. The car started missing horably and then speedometer and the temperature guage started acting eratically. Then the alternator light came on. I pulled over and turned off the car. After looking at everything under the hood, i decided to see what would happen i f irestarted the car. I started with no problem, no lights or anthing except the check engine light. The speedometer and stuff worked fine. I had to do this two or 3 times to get back home. When i got home, i pulled the codes off the compter and got the following codes. P-0106, P-0123, P-1478, and P-168.4. I replaced the map sensor, cleared the codes and none of those codes reappeard and the check engine light was off. I drove to town the next day. The car drove great. Problem solved i thought. Then the missing started on my way back home. None of those codes ever returned except the last and that is related to disconnecting the battery.
When i got back home i ready the codes, expecting to see the same codes and to find out the map sensor was not the problem at all. This time i got the P0204 code. If the vehicle runs long enough, the p0304 will come on as well. I have replace the spark plugs and wires. I have not done everything that was done in the previous post, but i have taken it apart several times and to no avail. My engine misses all the time. If i clear the code, it comes back immediately. I have looked for a visual damaged area on the wiring harness, but have not found one yet. To verify that it was not the injector, i swapped the #4 and #6 injectors and still have the same problem. I disconnected the #6 injector and started the car. The voltage on this injector read 2.5-3 volts., same for the #2 injector. The voltage on the #4 injector was 15 voltas approximately. Thats as far as i have gotten. I do have an ohm meter and know how to use it. Just not familar with the wire harness good enought to know where a short might be or which pin to measure at the ecm to check for a short in the wire. Another forum told me they thought it might be the ecm (computer) and that it might have a bad driver. However, when i went to order one today. The guy told me to make sure i didnt have a short or it could just blow the new ecm. Any help would be greatly appreciated.
I can do anything mechanically related if someone can give me some direction. I dont mind buying a rebuilt computer, but dont wish to do this if it is not the problem.