oregonloyale Posted November 3, 2005 Share Posted November 3, 2005 90 Legacy 2.2l MT wagon I recently cleaned my MAF w/100% 0 residue electronics cleaner and also cleaned my IAC. Well put it all back together and the IAC was bad. Bad magneto = idle at 1500- 2000 rpm and wouldnt drop. Magneto wasnt dropping the plunger down. I replced the IAC with a good one and now my idle is great. Problem is , now I have a wierd kinda loud trumpet hum/howl sound coming from my MAF area? I pulled it all apart and I have no restrictions, no vacumn leaks and the car drives great. just this weird sound that goes away as the rpms increase. Could this be my MAF? I have a check engine light on and one of the codes is for the MAf , thats why I cleaned it to begin with. I have used this cleaner before on countless other MAF's , so I know its safe. Help! Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted November 3, 2005 Share Posted November 3, 2005 90 Legacy 2.2l MT wagonI recently cleaned my MAF w/100% 0 residue electronics cleaner and also cleaned my IAC. Well put it all back together and the IAC was bad. Bad magneto = idle at 1500- 2000 rpm and wouldnt drop. Magneto wasnt dropping the plunger down. I replced the IAC with a good one and now my idle is great. Problem is , now I have a wierd kinda loud trumpet hum/howl sound coming from my MAF area? I pulled it all apart and I have no restrictions, no vacumn leaks and the car drives great. just this weird sound that goes away as the rpms increase. Could this be my MAF? I have a check engine light on and one of the codes is for the MAf , thats why I cleaned it to begin with. I have used this cleaner before on countless other MAF's , so I know its safe. Help! It's easy to miss the tabs going in correctly on bottom of the air filter box. I dunno - just a guess. Link to comment Share on other sites More sharing options...
Legacy777 Posted November 3, 2005 Share Posted November 3, 2005 Yeah check the filter box area. The engine will make a certain hum sound through the intake.....but I don't know if I would describe it as a trumpet. Link to comment Share on other sites More sharing options...
oregonloyale Posted November 3, 2005 Author Share Posted November 3, 2005 I have pulled the air box apart and put it back together a few times to no avail. I wish I had a sound bite , it is considereably loud with the hood open in the garage. I even took the maf sensor off , left it connected electricaly and to the intake tube started the car and it still made the sound. i thought it was the actual airbox aswell , but after doing the above test ,now I think its the MAF. Link to comment Share on other sites More sharing options...
Legacy777 Posted November 3, 2005 Share Posted November 3, 2005 Unplug the maf, remove it, and start the car. It'll probably not run real well, but it should run. Link to comment Share on other sites More sharing options...
oregonloyale Posted November 4, 2005 Author Share Posted November 4, 2005 Thanx , wasnt sure If I could do that? Ill try tonight. Link to comment Share on other sites More sharing options...
Danbob99 Posted November 4, 2005 Share Posted November 4, 2005 Your car won't run well at all with out an maf, and you will then most certintly throw a cel, in adition to whatever it is now. I've worked on cars in the past that have developed that same hum, its a tough one to find, but it is usually to do with the resonator setup on the car. Check to see that you didn't knock any of the resonators partially free of the intake... if the air leak is after the maf that would be enough to cause your cel... you might might want to stop by some wehere to find out what the light is... that might be a little more indicitive of what the problem really is, the light may be something completely un related... Link to comment Share on other sites More sharing options...
oregonloyale Posted November 4, 2005 Author Share Posted November 4, 2005 I have already pulled the codes, and I know what they are. I have also removed the intake tube from the back of the MAf while it is running to isolate the sound and it is coming from the Maf tunnel. throwing a CEL is no big deal. Pull battery cable off for 30 minutes reconnect , dont touch anything , turn off once warm. ECU reset. Anyways. Thanx Link to comment Share on other sites More sharing options...
bfg9k Posted November 4, 2005 Share Posted November 4, 2005 I have already pulled the codes, and I know what they are.I have also removed the intake tube from the back of the MAf while it is running to isolate the sound and it is coming from the Maf tunnel. throwing a CEL is no big deal. Pull battery cable off for 30 minutes reconnect , dont touch anything , turn off once warm. ECU reset. Anyways. Thanx I have the identical issue on my '98. I recently replaced the K&N air filter with a run of the mill STP, having lost faith in the K&N's filtering ability after reading about many tests of it. The air box is tightly sealed, along with the tube to the air reservoir...I'm thinking I may peek inside the air box to make sure the filter is seated correctly. Link to comment Share on other sites More sharing options...
Lawsonmh15 Posted November 5, 2005 Share Posted November 5, 2005 90 Legacy 2.2l MT wagonI recently cleaned my MAF w/100% 0 residue electronics cleaner and also cleaned my IAC. Well put it all back together and the IAC was bad. Bad magneto = idle at 1500- 2000 rpm and wouldnt drop. Magneto wasnt dropping the plunger down. I replced the IAC with a good one and now my idle is great. Problem is , now I have a wierd kinda loud trumpet hum/howl sound coming from my MAF area? I pulled it all apart and I have no restrictions, no vacumn leaks and the car drives great. just this weird sound that goes away as the rpms increase. Could this be my MAF? I have a check engine light on and one of the codes is for the MAf , thats why I cleaned it to begin with. I have used this cleaner before on countless other MAF's , so I know its safe. Help! I've cleaned my MAF ALOT with BG 402 Brake and contact cleaner. I don't know what YOU used, but the BG clearly states that it is o2 Sensor safe. BUT, keep in mind that your primary part of the MAF, is a THERMISTOR. (Thermal Resistor). Incredibly THIN and SENSITIVE. You must LIGHTLY spray it to avoid damage. If you're throwing a code, it could be that you didn't reconnect the connector, or the most common, forgot to reconnect the hose at the bottom of the first resonator air intake. The last possibility I could think of, is that your airbox isn't properly seated. Heard horror stories of people getting the AF changed at a lube joint and they put it on wrong. You pretty much HAVE TO remove the first resonator air intake from the MAF side in order to get it to properly seat. Trust me, backing out the one screw and pulling the tube is ALOT quicker than elbow grease and frustration. Good luck Link to comment Share on other sites More sharing options...
oregonloyale Posted November 5, 2005 Author Share Posted November 5, 2005 Everything is tight. disconnected the MAF and started it and made no noise. I have since sold the vehicle. Thanx Link to comment Share on other sites More sharing options...
Lawsonmh15 Posted November 5, 2005 Share Posted November 5, 2005 Everything is tight.disconnected the MAF and started it and made no noise. I have since sold the vehicle. Thanx Quitter JK Why? What did you get? Link to comment Share on other sites More sharing options...
tunered Posted November 5, 2005 Share Posted November 5, 2005 you know this has to be a air leak,spray some wd40 around the air box and see if you can isolate it to one particular area. Link to comment Share on other sites More sharing options...
oregonloyale Posted November 7, 2005 Author Share Posted November 7, 2005 I am a mechanic and have been working on VW for 7 years. This is my 4th subaru. I dowsed EVERY point that has a vacumn and nothing. The car was bought to be sold , so I actually never quit. Now I have a 93 Legacy LS sedan AWD that will be gone thru and then for sale. Link to comment Share on other sites More sharing options...
n16ht5 Posted November 7, 2005 Share Posted November 7, 2005 my ej22 does it too. its from this wierd HUGE vacuum line just below the MAF.. these damn subarus.. i think im selling mine.,. i dont know what the hell they put in these engines nowadays Link to comment Share on other sites More sharing options...
tunered Posted November 7, 2005 Share Posted November 7, 2005 my ej22 does it too. its from this wierd HUGE vacuum line just below the MAF.. these damn subarus.. i think im selling mine.,. i dont know what the hell they put in these engines nowadays keep in mind that these cars are no different than any others,when something is broke it needs fixed. Link to comment Share on other sites More sharing options...
Lawsonmh15 Posted November 8, 2005 Share Posted November 8, 2005 my ej22 does it too. its from this wierd HUGE vacuum line just below the MAF.. these damn subarus.. i think im selling mine.,. i dont know what the hell they put in these engines nowadays That hose goes directly to your IACV. Yes it IS important. Link to comment Share on other sites More sharing options...
oregonloyale Posted November 8, 2005 Author Share Posted November 8, 2005 No worries , the car was bought to be sold. And it sold:) Link to comment Share on other sites More sharing options...
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