friendly_jacek Posted October 5, 2005 Share Posted October 5, 2005 Is it normal? It happens everytime I try. The buzzing sound is somewhere from engine and stops when I release the pedal. Can anyone with 2000-2004 SOHV 2.5L H4 confirm if that noise is normal? Additional observations: with engine off, OBD2 interface registers MAP 29.5 inHg (normal at sea level) but 25 RPM, 2% engine load, and 0.4 lb/min air flow (i know, it should be 0 for all of them). After the pedal manuver, the pressure jumps to 30.1, 25 RPM persists, but the other values go to 0. WTF? Am I overanalyzing? Quote Link to comment Share on other sites More sharing options...
nipper Posted October 5, 2005 Share Posted October 5, 2005 The only thing i can think of is maybe in the fuel system. THe fuel pump is running at this time, and maybe you have a noisey fuel pressure regulator or acumilator. Stick your head under the hood and see if you can find it See whats running and whats not. nipper Quote Link to comment Share on other sites More sharing options...
nixon Posted October 5, 2005 Share Posted October 5, 2005 Sounds like your throttle position sensor. At least it aint buzzin with your foot of the gas. It's normal [i hope],mine does it. Quote Link to comment Share on other sites More sharing options...
nipper Posted October 5, 2005 Share Posted October 5, 2005 if thats true i just learned something new nipper Quote Link to comment Share on other sites More sharing options...
Setright Posted October 6, 2005 Share Posted October 6, 2005 Your ABS pump can make buzzing noises too. Normal test procedure. Quote Link to comment Share on other sites More sharing options...
brus brother Posted October 6, 2005 Share Posted October 6, 2005 Fuel pump. Quote Link to comment Share on other sites More sharing options...
friendly_jacek Posted October 6, 2005 Author Share Posted October 6, 2005 So, we have votes for TPS, fuel pump, and ABS. It doesn't really matter. I guess I can ask my wife to press the pedal and I will check myself what is making the noise. Can someone try and tell me if it can be duplicated in another subaru? Thanks! Quote Link to comment Share on other sites More sharing options...
nipper Posted October 6, 2005 Share Posted October 6, 2005 we can add one more place to check ... the power brake booster. may be a sticky check valve in the booster vibrating. Quote Link to comment Share on other sites More sharing options...
Tiny Clark Posted October 6, 2005 Share Posted October 6, 2005 Horsefly under the gas pedal? Yea, best bet is locate it while it's doing it, with length of rubber hose to the ear or a stethoscope. Quote Link to comment Share on other sites More sharing options...
brus brother Posted October 6, 2005 Share Posted October 6, 2005 My 2000 legacy gt does it... same as above, ignition on (engine running or not) press on the gas pedal sounds like small electric motor buzzing... release gas pedal sounds like nothing. Always assumed fuel pump but I'm open to suggestions. Checked for horse fly... none found. Quote Link to comment Share on other sites More sharing options...
nipper Posted October 6, 2005 Share Posted October 6, 2005 could it be just a loose heatshield .... now im going to have check my car hehehe nipper Quote Link to comment Share on other sites More sharing options...
Legacy777 Posted October 9, 2005 Share Posted October 9, 2005 It's normal whatever it is. Mine does it. Quote Link to comment Share on other sites More sharing options...
blitz Posted October 9, 2005 Share Posted October 9, 2005 Is it normal? It happens everytime I try. The buzzing sound is somewhere from engine and stops when I release the pedal.Can anyone with 2000-2004 SOHV 2.5L H4 confirm if that noise is normal? Additional observations: with engine off, OBD2 interface registers MAP 29.5 inHg (normal at sea level) but 25 RPM, 2% engine load, and 0.4 lb/min air flow (i know, it should be 0 for all of them). After the pedal manuver, the pressure jumps to 30.1, 25 RPM persists, but the other values go to 0. WTF? Am I overanalyzing? I get that on my 4EAT vehicle. I always assumed it was sound the duty-cycle of solenoid "C" in action. In order to control analog fluid pressure to the rear clutch, it needs to be rapidly pulsed (buzzed) with a variable duty-cycle the same way that fuel injectors are. So if you tell me that you have a manual trans then then I'm completely wrong. Quote Link to comment Share on other sites More sharing options...
Lawsonmh15 Posted October 9, 2005 Share Posted October 9, 2005 So, we have votes for TPS, fuel pump, and ABS. It doesn't really matter.I guess I can ask my wife to press the pedal and I will check myself what is making the noise. Can someone try and tell me if it can be duplicated in another subaru? Thanks! ************ man, I can duplicate it with no prob. Just played a little jig with the pedal. LOL. I think it's the "everything's fine, now drive me" sound. BTW: This is on a 99 2.5L DOHC. Hope this helps. Quote Link to comment Share on other sites More sharing options...
subie94 Posted October 9, 2005 Share Posted October 9, 2005 i've always been told not to depress the gas pedal without the engine running. :-\ Quote Link to comment Share on other sites More sharing options...
blitz Posted October 9, 2005 Share Posted October 9, 2005 On second though, I think it may be the sound of the main pressure solenoid duty-cycling. The electronic tranny adjusts the shift-firmness according to throttle position. Quote Link to comment Share on other sites More sharing options...
friendly_jacek Posted October 9, 2005 Author Share Posted October 9, 2005 On second though, I think it may be the sound of the main pressure solenoid duty-cycling. The electronic tranny adjusts the shift-firmness according to throttle position. You are probably correct, I have 4EAT and the sound is coming somewhere from the tranny rather than engine. Quote Link to comment Share on other sites More sharing options...
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