apparent lean running issue?

[Robert Myers]

Simple gadget to build and use.  Get a 5-6 inch 
long piece of 3" PVC pipe and a cap for said 
pipe.  Drill appropriate sized hole in cap for 
tire valve.  Inserft tire valve and then use PVC 
cleaner/cement to attach cap to pipe.

Now disconnect induction hose from MAF and clamp 
it onto your new pipe.  Pressurize the system 
with shop air to perhaps about almost sorta close 
to (;-)) 10 psig.  If it won't hold air at all 
look for a big leak.  If it will hold some air 
listen for snakes hissing and follow the sounds to the leak.

I can send a photo if you want/need it.

Bob


At 09:11 AM 11/11/2008, kneale at coslink.net wrote:
>Unfortunately, I don't have the link on this computer, but somewhere in the
>Audifans archives there have been repeated references to a page describing
>and picturing how to test the intake hoses with slight air pressure using a
>rubber end cover for a 3-inch sewer line with a schrader valve glued into
>the end.
>
>Original Message:
>-----------------
>From: David M. Yentema yentemad at rider.edu
>Date: Mon, 10 Nov 2008 21:57:13 -0500 (EST)
>To: larrycleung at gmail.com, quattro at audifans.com
>Subject: Re: apparent lean running issue?
>
>
>hmm... can't say that i have. how would i got about doing that?
>----- Original Message -----
>From: "LL - NY" <larrycleung at gmail.com>
>To: "Dave Yentema" <yentemad at rider.edu>
>Sent: Monday, November 10, 2008 9:17:20 PM (GMT-0500) America/New_York
>Subject: Re: apparent lean running issue?
>
>Did you check the igloo for leaks. They're kind of hard to find.
>
>
>On 11/10/08, Dave Yentema < yentemad at rider.edu > wrote:
>
>OK well, I've got every vacuum leak that I know of taken care of, just put
>a
>new VC gasket on, replaced 90% of my vac lines (the rest I know are fine),
>put a new o-ring on my oil dipstick, new oil filler cap, silicone breather
>hoses from 034, etc. I wish I had a WB 02, but my narrowband shows a
>definate trend of running lean. At idle sometimes it'l wobble back and
>forth
>around stoich, going slightly(like one "bar") rich which is the way I had
>originally set it. But most of the time it bounces slightly lean to high
>stoich, sometimes rich, and the idle surges as it changed. When I first hit
>the gas to accelarate, it'll snap down so lean its not on the gauge and
>then
>come back up, bouncing from like 3 bars of lean to 1 bar of rich, while
>spending more time in lean. Under full throttle it'll go rich like it
>should, but the second I let off the slightest bit it'll start bouncing
>lean
>again even under boost!!!. on decel(letting my foot off completely from
>doing like 50) the exhaust pops irradically, and the gauge is all over the
>place but likes to hang out in the rich area( my car's an autobox, so no
>decel valve) I felt it miss twice the other day under mild accelaration. I
>was thinking perhaps it was my injectors/seals because for a while I had a
>leaky VC gasket, so maybe the seals got soaked with oil and got destroyed.
>Any suggestions are awesome
>
>Oh yea, its a 87 5ktcs
>
>TIA
>-Dave
>
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>
>--
>David M. Yentema
>Rider University Racing with Embraced Vehicle Design(RUREVD)
>President
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>- Release Date: 11/11/2008 8:59 AM