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07-31-2010, 11:08 PM
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#1 |
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12psi boost
Join Date: Jul 2010
Location: Utah
Posts: 332
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MKiii making a weird noise
My mkiii turbo auto. that i just bought which is num 3 for me has been makin a weird noise sounds like out of the transmission. the tranny has been rebuilt in 08 car came with the receipts for rebuild. its kind of a whining noise and it gets louder with rpm's i am planning on doin a auto to manual swap but i dont have the money for that right now. car kinda feels slow motor runs good beside the knock sensor code (in the middle of rewiring them) not surre if tranny is to blame but comin off freewy decelarating rpms jump up and down?? any suggestions would be greatly appreciated. Thanks
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08-03-2010, 01:55 AM
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#2 |
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12psi boost
Join Date: Jul 2010
Location: Utah
Posts: 332
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So i am starting to think my cat is clogged the noise goes away when its warm. and yes it has completely stock exhaust no bolt has ever been un turned on this car..
Is it common for cats to clog on these cars although i know not many of them have them anymore and mine is only goin to have one and turbo back exhaust ASAP. does anyone have one for sale. Car feels alot more responsive since i rewired knock sensors but turbo lag is just crazy.. I have taken intake off and checked turbo and wastegate both are in good workin order no bearing play. |
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08-03-2010, 02:04 AM
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#3 |
 Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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They generally breathe well enough to avoid clogging... that's not to say it doesn't happen.... too much carbon released all at once thanks to the brilliant use of seafoam or similiar... too much soot from run deadly rich... collapsing of the catalyst structure due to significant vibration or a couple bad hits to the front of the unit.
How quickly is the turbo spooling? What kind of mileage are you getting? Have you checked for exhaust leaks?
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If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal.  Tip Jar --->  |
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08-03-2010, 08:14 PM
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#4 |
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12psi boost
Join Date: Jul 2010
Location: Utah
Posts: 332
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the guy i bought it from did mention something about sea foam.. i took the car today to get it inspected and emissioned and it passed with flying colors so i dont think its the cats anymore...
the noise goes up with rpm so maybe like the main shaft bearing in the tranny i am thinkin.. and for the turbo lag i took the BOV out to atmesphere and blocked intake hole (just for troubleshooting) and it starts whistling while im in boost so the BOV is not closing all the way im sure thats my problem there.. have yo heard of the shaft bearing going out on rebuilt tranny? the car has 176k on it so there is a chance they didnt change the bearing during rebuild. |
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08-04-2010, 12:47 AM
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#5 |
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Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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A clogged cat doesn't mean you'll fail emissions... a glazed cat means that. The stock cat flows maybe half the capacity of the engine at a medium load... actually, probably less.
Could definitely be the bearing, never presume a component (even new) isn't likely to fail. I was under the impression that when those bearings went that you felt it more than heard it though. Very much not a fan of seafoam... but in this case even steaming the inside of the engine could have the same effect of loosening too much debris at once.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> |
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08-04-2010, 03:31 AM
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#6 |
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12psi boost
Join Date: Jul 2010
Location: Utah
Posts: 332
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Did some more wrenching today and set the timing with the jumper in at 10 degrees it was at 15 and now the turbo spools noticeably quicker...this is the fun part about buying a car u get to go CSI to find there mistakes... car runnin better everyday so I think injector were dirty . Ordered a new saab bpv to fix boost prob. but the noise is bugging it goes away when warm and whn in gear stopped. Definatly coming from the pass. Side. I appreciate all you help. I'm stumped
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