Check valve/diagnostic ? in exhaust system...

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Old 12-04-2003, 11:02 AM
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Default Check valve/diagnostic ? in exhaust system...

Hey guys...

[I don't have my Bentley here at work and I can't remember the exact name for what I'm trying to ask you about. It's in the exhaust system and can be easily reached behind the front passenger wheel of my 85 4kq. I think I looked it up once before and it's a spot perhaps where the dealer does emissions or diagnostic tests?]

Anyway, I usually keeped it plugged up with an epoxy putty so my car doesn't sound like a hot rod (since I blew what ever original cap was once there). Thing is, my "plug" repeatedly blows off. It's no big deal...just have to crawl down and re-plug it again.

Question: Do any of you guys have this similar problem? And if so, do you know of a better means of plugging it (other than getting it welded or getting a new one)?

Thanks for your input...it drives me crazy!

--morgan
Old 12-04-2003, 11:04 AM
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Default Yes, it's common. Answer = weld. ;-(

I've tried epoxy too. Problem with welding is that areas is so corroded, it takes a little grinding to find weldable metal.
Old 12-04-2003, 11:10 AM
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Damn. I'll just keep on plugging it till she falls off. Thanks!
Old 12-04-2003, 11:30 AM
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you might try a product called JB Weld... might be stronger than the epoxy you're using.
Old 12-04-2003, 11:51 AM
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JB and I are close...before I replaced my mid-muffler, it was entirely JB Weld and screen!! Thanks.
Old 12-04-2003, 11:58 AM
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Default Re: Check valve/diagnostic ? in exhaust system...

The tech broke mine off when he was trying to remove it a few weeks ago. He showed me that he really plugged the hole good. Funny thing is, is when I removed the downpipe, I kept that thing attached, and it came out fine. He seemed shocked that I didnt remove it. I had no idea what it was at the time, and it came out fine with the downpipe, oh well.

Mike
Old 12-04-2003, 12:28 PM
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Default Its for testing the CO when you are adjusting the mixture..

Its so you can hook up the CO tester to measure it up front rather than out the rear tailpipe..
Old 12-04-2003, 01:41 PM
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Default Here's what I did.....

I got a stainless sheet metal screw that fit the hole. I went to the local home depot and found a very fat, very short ss screw that fit the hole, and screwed it in. Tightened it up, and no more leak. Had one of my 4kq's like that for about a year and a half. No problems.

Good Luck!
Greg Roa
Cincinnati, OH
86' 4kcsq x2
87' 5kcstq
93' 90CS
83' 944
Old 12-04-2003, 02:18 PM
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Default w00t.... a love connection?

'Seeking a nice girl who knows about the amazing power of JB weld. Must have Audi 4000s and S4's. Please send pictures of S4.'
<3 Brad
Old 12-04-2003, 02:22 PM
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hehehe... 8-)
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