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Old 02-28-2017, 05:47 PM   #676
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That sounds like a nasty vac leak
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Thank you very much everybody... i now feel sufficiently retarded and will go cry in the corner...
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Old 02-28-2017, 05:55 PM   #677
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WTF?
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Old 02-28-2017, 06:08 PM   #678
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Turbo-related? It definitely sounds like air going through a really small hole...
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Old 02-28-2017, 06:11 PM   #679
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The only time you can hear it really clearly is right as the engine is shutting down and it sounds like it's from around the turbo. Otherwise it's so loud that you just can't pinpoint it.

But my alternator still isn't charging right and that's making things difficult as my battery will eventually just die.
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Old 02-28-2017, 08:25 PM   #680
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So I noticed that you can hear it some while the car is cranking and if it's coming from a cylinder it sounds like only one. I'll have to wait until I have someone here to turn it over while I poke around.
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Old 02-28-2017, 08:40 PM   #681
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What if it's some really bad alternator brushes? I thought it sounded like air, but if it's coming from that area and you're having charging issues...
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Old 02-28-2017, 08:46 PM   #682
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It's done it with two different alternators now. I just put on a good used one after I thought my original one was bad. Maybe it wasn't after all That could be a ground issue with my bracket I guess.
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Old 03-02-2017, 07:19 PM   #683
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So I noticed that you can hear it some while the car is cranking and if it's coming from a cylinder it sounds like only one. I'll have to wait until I have someone here to turn it over while I poke around.
Why wait around for someone to help. You should be able to pick one of these up at the local auto parts:

https://www.google.com/search?q=remo...w=1366&bih=657
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Old 03-02-2017, 09:55 PM   #684
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I'll check it out this weekend. Thanks for the tip. I'm more frustrated that a noise this loud should be pretty obvious, but it apparently is not.
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Old 03-03-2017, 08:57 AM   #685
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Automotive stethoscope might help too
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Old 03-03-2017, 09:21 AM   #686
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I picked one up the other day but it hasn't helped much. It doesn't seem to pick up higher pitched noises very well. Maybe I'll borrow a better one and revisit that.
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Old 03-03-2017, 09:48 AM   #687
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Cracked spark plug? Or a worn out or stripped plug hole?
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Old 03-03-2017, 11:17 AM   #688
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I think I'm going to put some plugs in it anyway. I put these in about two years ago when I had the engine on the stand. And I want to check compression while I have the header off and can easily access #1.
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Old 03-04-2017, 01:03 PM   #689
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Recent discoveries have shown that I probably need to hook up my idiot light so my alternator will charge...
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Old 03-07-2017, 01:07 AM   #690
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Another old school trick: Get a 3-4 foot piece of vacuum hose, stick one end in your ear and point the other end at stuff. It can really isolate where the noise is coming from. Tape it to a long screwdriver to poke it into nooks and crannies.
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Old 03-07-2017, 11:15 AM   #691
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Recent discoveries have shown that I probably need to hook up my idiot light so my alternator will charge...
Yeah, it's part of the exciter circuit. Any progress on finding the noise?
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Old 03-07-2017, 12:48 PM   #692
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Nah I had half of the day Sunday to mess with it but I took a nap instead. Maybe tomorrow if I don't have to work. Starting to think I should prep a different car to take to the mountains in a month. I got a care package from Ian with everything I need to fix my 142 and I have some coilovers and new wheels that need to go on my Miata. Those projects are much more likely to be completed within a month.
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Old 03-07-2017, 03:21 PM   #693
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I bet you it's what Mike said - cracked plug, loose plug, or stripped thread.
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Old 03-07-2017, 03:37 PM   #694
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The only time you can hear it really clearly is right as the engine is shutting down and it sounds like it's from around the turbo
Like the turbo spinning down....
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Old 03-07-2017, 04:11 PM   #695
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Like the turbo spinning down....
Well not quite, but I wish. It's a weird sound to describe. It's a lot like a whistle but almost like a high pitched squeal. I'm definitely going to pull the plugs tomorrow and poke around while the header is off.
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Old 03-08-2017, 02:13 PM   #696
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Pulled the plugs and they look...like plugs? Nothing weird really. I'll replace them anyway. Header is currently off to replace a few gaskets.

Biggest find so far is I can fit a .004" feeler in between the intake flange and throttle body. So even if that isn't my noise, it's definitely a vac leak. Thinking of cutting a thicker gasket out instead of trying to machine this thing though.

I'll avoid RTV if I can but, then again, I'm me so there's no guarantees.
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Old 03-08-2017, 03:42 PM   #697
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Originally Posted by AndrewNance View Post
Pulled the plugs and they look...like plugs? Nothing weird really. I'll replace them anyway. Header is currently off to replace a few gaskets.

Biggest find so far is I can fit a .004" feeler in between the intake flange and throttle body. So even if that isn't my noise, it's definitely a vac leak. Thinking of cutting a thicker gasket out instead of trying to machine this thing though.

I'll avoid RTV if I can but, then again, I'm me so there's no guarantees.
I wonder if you could throw a NA manifold and down pipe on there and see if the noise is still there.
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Old 03-08-2017, 04:22 PM   #698
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sounds like a vac leak in the intake manifold/tb, as it changes when you rev it a little. Maybe a small crack between original/custom manifold or around the injector holes in the manifold?
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Old 03-09-2017, 08:09 AM   #699
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Not sure what fixed it as I replaced the plugs, exhaust gaskets, turbo flange gasket, and cut a thicker .012" TB gasket but the noise is completely gone. My money would be on a warped TB flange. Still an annoying bearing chirp that's probably the old timing belt tensioner that I never replaced.



I don't think I'm going to be able to use this turbine housing though. Someone welded a v-band flange to it and warped it all to hell and I can't get it to seal no matter what. From the driver's seat, you can see inside it when the car is cranking. I have a .63 T3 housing but I'm not sure it will work with the current wheel, and it will need the wastegate welded shut. It looks the same internally but I don't know anything about wheel stages, trims, etc. More on that later.





I ran a wire to my amp light and my alternator still doesn't seem to be charging and the light isn't working. It's only showing about 11.7v in MS. I remember having some issue with the light way back when the car got converted to an alternator about six years ago. The light would stay on with the engine off and go out when the key was turned on so we just put in a voltmeter and left the light disconnected. I'll have to poke around with the meter to see what's happening there.

Last edited by AndrewNance; 03-09-2017 at 08:18 AM..
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Old 03-09-2017, 08:32 AM   #700
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Awesome!! No more dental drill! Build is looking really good.
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