[Shotimes] Smog Woes

Fri, 5 Mar 2004 13:50:45 -0800 (PST)

You can run the wires w/o removing the intake. Its not
the funnest thing in the world but it's do-able.

Shylo McKinsey

'91 White MTX

--- Mike.Wojton@us.o-i.com wrote:
> AC affecting idle.  That sounds familiar.  When my
> defroster is on,
> the idle will sometimes drop enough to stall the car
> if I don't catch
> it in time.  When I pull the intake off to finish
> the plug wire job I
> plan to clean the IAB.  If that doesn't work, I'll
> have to start
> trouble-shooting.
> 
> 
> Mike Wojton
> Toledo, Ohio
> 
> -'95 White MTX
>    '96 Brake Upgrade
> 
> "Avoid the clap." - Jimmy Dugan
> 
> 
> 
> 
> shotimes-admin@autox.team.net wrote on 03/05/2004
> 10:20:54 AM:
> 
> > I've been too busy at work to make much progress
> on the car, but I did 
> get a
> > new intake manifold gasket installed this week. I
> had mangled the 
> previous
> > one after removing the manifold after my first
> smog test - now at least 
> I
> > know it's not contributing to my woes.
> > 
> > Original test results with 80mm maf and lpm were
> as follows:
> > 
> >             Item    max/ave/meas
> >  15mph       HC     114/31/38
> >              CO     0.73/0.10/.01
> >              NO     785/237/1064
> > 
> >  25mph       HC     88/20/34
> >              CO     .61/.09/.01
> >              NO     724/199/723
> > 
> > So I have some HC I could "trade" for NO with some
> lpm programming, I
> > suppose. Not a very precise way of doing that,
> though, unless it can be 
> done
> > in real time.
> > 
> > My subsequent test attempt was done on a rainy day
> with the OEM maf 
> setup
> > (no lpm) and the spout plug pulled. That resulted
> in an aborted test, 
> after
> > several attempts, due to difficulties maintaining
> a constant rpm. I 
> think
> > Leigh's comment below regarding the AC system may
> be correct though - it 
> was
> > raining and the defroster may have been on. The AC
> system on this car 
> does
> > have issues that affect the rpm's when it kicks
> in.
> > 
> > The EGR passages are very clean. The back sides of
> the valves have a 
> little
> > crud on them, but from my untrained eye it doesn't
> seem like a lot.
> > 
> > The intake tract is pretty oily, but I believe
> this is a typical result 
> of
> > the PCV system, right?
> > 
> > Where do I get GM top cleaner and is this used in
> the gas tank or 
> applied
> > directly thru the intake?
> > 
> > Thanks much,
> > 
> >     Alan
> > 
> > 
> > > Turn the A/C off, restart the car, and see if
> that helps. My 
> compressor on
> > > my 89 was seizing intermentantly, and it thru
> off the idle control 
> computer
> > > bigtime for over a year til I found it.
> > > To check for vacuum leaks: disconnect hose at
> engine, need hand held 
> vacuum
> > > pump/guage, should hold.
> > > I've seen leaks in hoses, connections, fittings,
> vacuum tank in 
> fender, and
> > > the vacuum pull hose for the cruise control down
> by the clutch pedal 
> where
> > > it rubbed thru the hose by the steering gear (my
> 94 with dead cruise).
> > > Manifold vacuum leaks can be checked with a
> spray of some type at the 
> gaket
> > > area with engine running.
> > > With all the mods you have you may need to check
> that your O2 sensors 
> are
> > > good, and the mixture is right. Did you get CO
> readings during you 
> smog
> > > check?
> > > Good luck
> > > Lee
> > > 
> > > 
> > > ----- Original Message -----
> > > From: "Alan Fanning" <Awfanning@earthlink.net>
> > > To: "SHOtimes" <shotimes@autox.team.net>
> > > Sent: Thursday, February 26, 2004 12:53 AM
> > > Subject: [Shotimes] Smog Woes
> > > 
> > > 
> > >> Between the weather (rain), work (12 hr days),
> and the SHO I'm about 
> to go
> > >> 'round the bend. I figured I was a shoe-in to
> pass smog today with 
> cool
> > > damp
> > >> weather and the SPOUT plug pulled. No such luck
> - besides running 
> like a
> > >> pig, as you had warned, the engine wouldn't
> hold a steady rpm setting
> > > while
> > >> on the dyno and the test was ultimately aborted
> after several 
> attempts.
> > > Last
> > >> time around (a couple weekends back) it seemed
> to hold rpm but 
> wouldn't
> > > pass
> > >> on NOx.
> > >> 
> > >> I removed the intake last weekend to clean the
> EGR passages (didn't 
> seem
> > > to
> > >> be clogged) and buggered up the gaskets in
> reinstalling the manifold. 
> No
> > >> spares, so I just put it back together. No
> doubt this didn't help 
> matters,
> > >> but one of the things that has puzzled me on
> this car from the get-go 
> is
> > >> that, with the trans in neutral or clutch pedal
> in, I can't get it to 
> hold
> > > a
> > >> constant elevated rpm below about 2000 rpm. It
> either scoots up or 
> down
> > > from
> > >> the point I'm trying to hold. Seems like a
> connected symptom. Vac 
> leak
> > >> maybe?  I've previously checked/replaced all
> the hoses and the intake
> > >> gaskets.
> > >> 
> > >> I've got about 5k on new plugs, plug wires, O2
> sensors, IAC valve, 
> and
> > > just
> > >> about everything else that is replaceable. I
> was running a 55mm MAF 
> which
> > > I
> > >> believe to be good, and no LPM. Spec's include
> Stage 1 cams, SHOShop 
> 3.2l
> > >> w/10.5:1 compression, stock manifold,
> new/rebuilt OEM-spec injectors.
> > > Engine
> > >> seems a little rough at idle, but I have no way
> of 
=== message truncated ===

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