I have a 1994 Dodge Caravan with 240K on it. It recently developed a low speed idle problem, where the vehicle would almost stall. It was OK at startup, but once it warmed up, the engine would idle below 500 RPM, and cycle between 400 and 700 rpm rythmically. After cleaning the throttle body, replaceing the Automatic Idle Speed motor, and Crankshaft engine speed sensor, the problem persisted. Coincidentally, the vehicle had developed a slow fuel leak in the gasoline line, in the return fuel line under the passenger seat.. on the frame. Low and behold, once I had the lines replaced, the idle problem disappeared. I assume that the slow leak in the return line to the gas tank posed a vacuum leak problem that upset the sensors. Unfortunately, no computer codes to indicate any problems. The vehicle has been amazing, yes I had the tranny done under warranty at 80K, and a tranny speed sensor replaced at 160K, but the vehicle has literally no rust, and still gives 30 MPG (Imperial on the highway). I only wish I could find another one. The ES had lower body plastic panels that protect it from stone chips etc. I guess I can expect some gas line, brake line issues after 14 years. Hopefully, some others will find the replacement diagnostics helpful.. Drive on
- posted
16 years ago