The van has a 3.0 liter engine. When driving, the engine will misfire and at the same time the speedometer will drop in speed. Sometimes it drops to near 0 if it continues to misfire. When I leave off the gas pedal and then reapply it will run fine and the speedometer immediately returns to the correct speed. Sometimes it will then run well for many miles, sometimes for only a few seconds. This started happening about 6 months ago once in a while and then would be fine for days or weeks. Now it is happening almost every time I drive the van. I just did a full tune up, plugs, wires, cap, rotor, fuel filter, air filter, and oxygen sensor but it didn't help. The only error codes are 12 and 55. Does the 12 mean the controller is loosing its electrical connection or is that just the starting code? The controller has been in the van for about 2 years and the battery has not been disconnected at any time since then. Any help you can give regarding this problem is appreciated.
Jan 10, 2009 at 2:36 PM
