apparent lean running issue?

LL - NY larrycleung at
Tue Nov 11 08:27:29 PST 2008

Don't know if he still has the kit, but Pete at DoubleZ motors (should be on
the vendor's list) had the proper injectors for quite reasonable when I did
mine (about 4 yrs ago). Just one possible source besides the more commonly
mentioned suspects.

On 11/11/08, Ben Swann <benswann at> wrote:
> Dave,
> If you have not replaced your injecvtor seals yet then by all means - do
> it! You could
> actually be blowing fuel out of the injector seal area while under boost
> and at idle
> pulling in too much air making it lean.  New injectors are not a bad ideal
> and in the
> interest of labor, I'd do sealks and injectors at same time, to save on
> labor.
> Ben
> [ate: Mon, 10 Nov 2008 19:33:07 -0500
> From: Dave Yentema <yentemad at>
> Subject: apparent lean running issue?
> To: quattro at
> Message-ID: <000001c94395$765e9d30$ae033b0a at Daveslaptop>
> Content-Type: text/plain; reply-type=original; charset=iso-8859-1;
>         format=flowed
> 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
> -Dave]
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