kaanan Posted May 9, 2012 Share Posted May 9, 2012 Hi All, My N/A Legacy has developed a bizarre engine problem over the last few days. It seems to only happen at highway speeds, and not under acceleration. The car doesn't want to stay at a steady 65-70 MPH. I can't tell if it's surging or losing power, or both. For instance, I'll bring the car up to 65, and if I let my foot rest on the pedal the car will accelerate for a second, then slow down for a second, then run fine for 5 seconds, and then the accel/decel will start over. Sometimes it just accelerates, sometimes it just looses power. It doesn't throw any CEL, and the problem doesn't seem to happen when I'm driving through the city. There is one other kinda strange thing the car does. When it is idling, it will keep a constant RPM, then every 15-20 seconds the RPMs will jump a few hundred, then come right back to normal. And thats not the most bizarre part. The engine can keep a constant speed when I have cruise control turned on. I was going to check all the obvious things like plugs, filters, wires until I put it in cruise control and saw it operating flawlessly. Are these cars drive-by-wire? Link to comment Share on other sites More sharing options...
kaanan Posted May 9, 2012 Author Share Posted May 9, 2012 I forgot to add, it's a 2006 with 103k miles on it. I also noticed it happening under slow acceleration at lower speeds now. And also at slow city driving. Really bizarre. Link to comment Share on other sites More sharing options...
AZP Installs Posted May 9, 2012 Share Posted May 9, 2012 Well, there are several things it could be. Maf, O2 sensor, plugs, wires. At 100k, plugs should have been replaced 3x, wires at 100k arent a bad idea either. We have seen several cars exhibit similar problems and it was a dirty maf and/or O2 sensor. When you have the timing belt done, i would have the mechanic check it out. -mike http://www.pbase.com/paisan/image/91072632.jpghttp://www.pbase.com/paisan/image/141039922.jpg http://www.pbase.com/paisan/image/133406601.jpg http://upload.pbase.com/image/137566671.jpg 11+ Years Maintaining, Modifying and Educating TriState Subaru Enthusiasts. Call directly as We carry almost every manufacturer now, so before you buy parts call us. AIM: AZP Installs | E-mail: sales@azpinstalls.com | 725 Fairfield Ave | Kenilworth, NJ 07033 | 908.248.2971 | T-1 Certified Amsoil Direct Jobber "Race Tested, Enthusiast Approved!" Link to comment Share on other sites More sharing options...
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