02M3 Posted April 4, 2005 Share Posted April 4, 2005 Over the past month or so, I've noticed something weird about the Legacy. Under harder acceleration, when I put the clutch in to upshift, the tach hesitates for a split second and then jumps about 100-200 rpms before dropping until I put it in the next gear. I don't hear the engine continue to rev up and I know my foot isnt still on the accelerator, so what is causing this? Is it something with the drive by wire throttle, or the turbo still taking in air, or just a minor glitch with the tachometer? It doesn't really bother me, I've just been curious about what the hell is causing this. Cheers! Link to comment Share on other sites More sharing options...
thuban114 Posted April 5, 2005 Share Posted April 5, 2005 Happens to me also, I was thinking it was the extra boost from the turbo ? As if it affects the motor before the BOV opens. This is the first car I have ever owned with a Turbo, but my good ole 350 from GM never did that. Could be the computer... but there is no reason for that to happen. Hopefully somebody with turbo experiance can answer this one. Link to comment Share on other sites More sharing options...
Rimfaxe Posted April 5, 2005 Share Posted April 5, 2005 Hadn't noticed this, but a week ago, I came up on some traffic on I95. I guess they were going really slow, because I had to downshift from 5th, to 4th to 3rd and I noticed that as the car decellerated, the check engine light began flashing. It went away after a few minutes, but it appear that downshifting like that caused some type of warning to go off. Hasn't come back yet. I guess I'll just brake like all the folks with an automatic transmission from now own. Anyway, don't want to hijack this thread, just my experience to share. Link to comment Share on other sites More sharing options...
02M3 Posted April 5, 2005 Author Share Posted April 5, 2005 Haha, not hijacking at all, I wanna know about all the quirks this car has. Glad to see I'm not the only person with this problem, but I sincerely doubt there is anything wrong with the car. I've never owned a turbo car either, so its a bit of a mystery to me. Anyone else have an idea whats going on? Link to comment Share on other sites More sharing options...
mwiener2 Posted April 5, 2005 Share Posted April 5, 2005 I figured that it was the ECU helping with rev matching. My buddies A4 1.8T doesn't do it. My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
eamiller Posted April 5, 2005 Share Posted April 5, 2005 It's normal operation of the ECU controlling the throttle. It allows for smoother driving, since you won't undershoot revs as easy and make for jerky shifts.. Link to comment Share on other sites More sharing options...
Deer Killer Posted April 5, 2005 Share Posted April 5, 2005 I figured it was because of the EPA.. burn the extra fuel from the injectors.. Link to comment Share on other sites More sharing options...
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