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Old 01-17-2012, 11:39 AM
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Default Weird chirping noise

So since I have had this 40 it's had this weird chirping noise that comes from somewhere around the intake exhaust manifold. I can't make it happen it just does when it wants to. Sometimes after driving on the highway or just around town. I want to think it's my heat riser valve but I am not totally sure. BTW I have a 7/70 fj40 with a mostly desmogged 2f. Here's a link to a video I took, the noise will happen when I press the gas pedal.
http://www.youtube.com/watch?v=HofrZCGN0wE&context=C32fa300ADOEgsToPDskLdNNyUc6AV6TyPG49LZRld[/url][/url]

Tell me what you think, I have searched high and low for something that looks like it's loose and haven't found squat.
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Old 01-17-2012, 11:48 AM
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Exhaust leak?

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Old 01-17-2012, 12:19 PM
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[quote=corsair23;200970]Exhaust leak?

That would be my guess also..
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Old 01-17-2012, 12:20 PM
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Maybe, exhaust is new from the manifold back. I bet it's the oem gasket. But there's a distinct metal rattle. I wonder if that heat riser flap is busted. And if it is, I wonder if that affects my mileage also. Btw thanks for posting that video. I am not real computer savy.

Last edited by bigcity25; 01-17-2012 at 01:09 PM.
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Old 01-17-2012, 05:44 PM
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exhaust for sure.. possible cat
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Old 01-17-2012, 05:56 PM
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"cat" you lost me there
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Old 01-17-2012, 06:09 PM
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http://www.youtube.com/watch?v=xEcpEKEsh4Q[/url]

http://www.youtube.com/watch?v=pKAWV-m0axw[/url]

You can kind of hear the rattle at the beginning of the first video and at the beginning and end of the second.

I agree there's something with the exhaust. Just can't make it happen and pinpoint when it does and doesn't happen.
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Old 01-17-2012, 10:37 PM
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Quote:
Originally Posted by bigcity25 View Post
"cat" you lost me there
I think he means you ran over a cat
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Old 01-17-2012, 10:40 PM
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Quote:
Originally Posted by bigcity25 View Post
http://www.youtube.com/watch?v=xEcpEKEsh4Q

http://www.youtube.com/watch?v=pKAWV-m0axw

You can kind of hear the rattle at the beginning of the first video and at the beginning and end of the second.

I agree there's something with the exhaust. Just can't make it happen and pinpoint when it does and doesn't happen.


Maybe a shield or something rattling?

To imbed your YouTube links, put the part in bold above in the YouTube wrap - you won't see the icon for YouTube in a quick reply section but you do see it if you click on "Post Reply"...or just wrap "{YOUTUBE} {/YOUTUBE}" this around the bolded parts...except use the brackets [ and ] vs. { and }



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Jeff Z. (the "not quite as skinny" one)
TLCA #17037
'97 LX450 - aka "The Whale"
'97 FZJ80 Antique Sage AE #267, stock
12/74 FJ40, 2F, SM420, 4" Lift, ARBs, 33" MTRs

:

"...anything else i can do for you guys, how about i wash your car or mow your lawn while you figure out your firewall system? I am now boarderline insane/unibomber." Kipper

"That assumes I'm even capable of pulling and stabbing..." Jacket

"I really like having a detachable unit." Beater
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Old 01-18-2012, 07:20 AM
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Your FJ40 doesn't have a "cat" - catalytic converter - that's a '79 and later thing.

It sounds like it could be precombustion (also called "pinging") to me - what's your timing set at? If it is an exhaust leak, with it being that big and noticeable you should be able to feel puffs of exhaust while it's running if you move your hand around the exhaust manifold area. Or you will be able to see a black sooty area where it's leaking. You could also take a squirt bottle with soapy water in it and see if you can make bubbles appear somewhere...

In your hood-up videos, it looks like you have a Weber on there? It is making significant noise as you're blipping the throttle - maybe there's something loose inside it?
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