When problem exists, the engine light is on. When the key is turned to start, the engine will crank a little before it will start. Thwn while driving it, it runs ok UNTIL getting RPM's a little over 2000 (in any gear - automatic tranny). Usually after traveling several miles, if I pull over, turn off car, the try to restart, it at times then starts right away and runs fine well above 2000 RPM's. This situation has benn going on for a while. Recently noticed that if car running ok then 'cruise control works, if not running ok above 2000 RPM's then criuse will not work at all.
engine light on, sometimes goes off on 2004 Dodge Neon
by zookman in Strausstown, PA on December 31, 2010
ANSWER by patrick mannion , December 31, 2010
Certainly needs to be investigated. If the Check Engine Light/Service Engine Soon light illuminates while you are driving, the car's on board computer sees a fault in the engines management system that is causing an excess amount of pollutants to be emitted from your car. This could result in engine damage if left neglected. Some problems that can cause the Check Engine light to stay on may take two "drive cycles' to complete before illuminating the Check Engine Light. The computer sees a problem and looks for an identical set of circumstances to occur to confirm that it has indeed seen a problem before turning on the light. A Check Engine light that continually flashes while you are driving is serious and is a sign that the computer sees a problem that seriously risks damaging the catalytic converter which may result in an expensive repair or even may cause a fire! Diagnostic codes are stored in the vehicle's computer and can be retrieved using a scantool that communicates with the computer in your car. We have in our Repairpal website an encyclopedia with in depth articles about computer, and computer control systems, emission and driveability problems. http://repairpal.com/check-engine-light. A scan tool is needed to retrieve codes stored in the computer in your car, even if the light isn't on code will likely still be stored.