apparent lean running issue?

[LL - NY]

You HAVE to take it off. Then manipulate, poke and prod it trying to see if
light gets through. The ideal would be to pressure test it, but I don't know
a convienient way of doing that with CIS. FWIW, my igloo had a leak in 1 cm
vacuum line fitting on the throttle body end (small end, not the meter plate
end) of the igloo. Never would have found it on the car.
The other place to check is IC hoses (the bottom hose is HARD to see, and it
accumulates oil and eventually fails) and the IC itself, although I would
think if the IC is leaking, it'll prevent boost from building up, the hoses
can sometimes hold, then fail. BTDT.

LL - NY

On 11/10/08, David M. Yentema <yentemad at rider.edu> wrote:
>
> 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
>