BSchlossmann Posted February 24, 2005 Report Share Posted February 24, 2005 I have searched the old archive without any luck... While crusing at highway speed I have recently noticed a slight oscillation in the cruise control. The symtom is that it feels like you are slightly stepping on the gas pedal and then letting off. This occurs about 4 times per minute. I'm hoping that maybe someone else on this board has experienced a similar problem and can provide a solution. This occurs on a perfectly level section of highway. Thanks... Link to comment Share on other sites More sharing options...
audioguy99 Posted February 24, 2005 Report Share Posted February 24, 2005 I had the EXACT same problem about a month ago. I had been working under the steering column on my alarm and then started having the problem...parking brake wouldn't work either. I went back under the dash, kinda moved things around so that nothing was pressing the (vacuum) lines and the problem went away. Shortly thereafter cruise quit working all together, but I found out that the dealership forgot to reconnect the plug under the hood while doing recall work on the fuel rail. Plugged it back up and again no problem since. I use cruise EVERY day on my commute. Don't know if that helps, don't know exactly what I did to fix it, but it works and I know what you are talking about. Maybe that gives you some ideas of where to begin investigating. Jonathan Link to comment Share on other sites More sharing options...
Ranger Posted February 24, 2005 Report Share Posted February 24, 2005 Bob, I recall a buddy of mine having the same problem with a GM car several years ago. I am not sure if it was the same type of CC unit or not. The more I think about it the more I think it was the old vacuum diaphram type unit but his problem turned out to be too much slack in the cable. Just a thought and something to look at. Link to comment Share on other sites More sharing options...
TDK Posted February 25, 2005 Report Share Posted February 25, 2005 BSchlossmann, My '94 DCS has also done this "feedback-loop" thing a few times, but only after I have pressed on the accelerator and certainly not very often even then. The vac and cable areas are certainly good places to start. It seems to be a mechanical-induced thing, so I would lean to the cruise actuator cable and throttle cable. There may be a hysteresis/sensitivity adjustment on a mechanical component? Perhaps a value in the computer's control loop algorithim (PID-loop) could be adjusted to compensate? Good crusin' Add power to leave problems behind. Most braking is just - poor planning. Link to comment Share on other sites More sharing options...
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