RE: Help! 16V High RPM Miss!

["Shannon Fenton" <sfenton@amazon.com>]

Allyn
Sounds very familiar. Was it a miss above 3000rpm or was it just running out
of steam. I did the mist test last nite and couldn't get any arcing about
the plug wires. This miss appears across all four plug wires as well. Its
somewhat rhythmic when seen with the strobe light.

Josh
Intercam and ignition timing are dead on. Cam sprocket set to 0.



Shannon Fenton
Telecom Resource Management
Desk 206.266.6736
Cell 206.953.6170
Pager 206.541.7831
http://internal.amazon.com/it/infrastructure/telecom/
www.amazon.com

-----Original Message-----
From: Allyn [mailto:amalventano1@home.com]
Sent: Thursday, June 07, 2001 12:37 PM
To: josh Wyte; David Guido; sfenton@amazon.com; scirocco-l@scirocco.org
Subject: Re: Help! 16V High RPM Miss!


Shannon,
i had a single plug wire go bad (30 mins on the way into the cincy trip,
argh). note it was not the coil wire (that you changed). what coaxed the
wire into going bad was my just pulling the wires before the trip to change
the plugs, and i guess it aggrivated it enough to fail. result was low power
that only showed up above 3000 rpm. idle was perfect. miss was audible when
reving at idle. seems similar to your problem, as it kinda acted as a rev
limiter. i also noticed that the problem was much worse with engine under
load. timing light pickup may be on the very same wire thats bad, try using
a different wire for the pickup. also, i've noticed some timing lights go
crazy in severe timing jumps/reving and 'miss' the light flash for that
fire.
hope this info helps
al


----- Original Message -----
From: "josh Wyte" <josh_wyte@yahoo.com>
To: "David Guido" <guido_david@hotmail.com>; <sfenton@amazon.com>;
<scirocco-l@scirocco.org>
Sent: Thursday, June 07, 2001 1:08 PM
Subject: Re: Help! 16V High RPM Miss!


> Shannon, please check your cam timing.
>
> -josh
>
>
> --- David Guido <guido_david@hotmail.com> wrote:
> >
> > Shannon,
> >
> > I think your idea of pulling the Schricks and
> > replacing the stock cams is a
> > good one. This way you will be able to tell if there
> > is a "cause and effect"
> > to the Schricks alone. If the problem goes away with
> > the stock cams and
> > you're still not 100% convinced, put the schricks
> > back in. If the problem
> > reappears then by god it must be the Schricks. How
> > could this happen with a
> > high quality cam is beyond me. Perhaps the cams
> > effect another part of the
> > engine management system adversely?
> > Sorry your having problems.
> >
> > David Guido
> > 1981 "S"
> > 1980
> >
> > >From: "Shannon Fenton" <sfenton@amazon.com>
> > >To: "Scirocco List" <scirocco-l@scirocco.org>
> > >Subject: Help! 16V High RPM Miss!
> > >Date: Wed, 6 Jun 2001 17:24:07 -0700
> > >
> > >Well as many of you know I have been having some
> > pretty bad probs with the
> > >car since the swap to Schrick 276 cams. I have been
> > working pretty much
> > >every night on the car trying to find the prob but
> > Im now completely at a
> > >loss and frustrated as hell. Read on.
> > >
> > >Problem: Car misfires at high RPM. Usually starts
> > at 4300-5000rpm and will
> > >effectively prevent any further acceleration. The
> > miss feels like a soft
> > >rev
> > >limiter. The miss is less severe when the car is
> > cold but still very
> > >prominent. It all most feels like I am running out
> > of fuel intermittently,
> > >but the car is coughing great clouds of black smoke
> > and I get small
> > >children
> > >high off the fumes while idling at stoplights.
> > Going stop to stop on the
> > >mixture screw has little effect on the miss. This
> > leads me to ignition but
> > >all components check out and/or have been replaced.
> > Car never did this
> > >before the cam swap.
> > >One thing we have found while testing is that above
> > 2K rpm I am losing all
> > >ignition output from the coil. This is evident in a
> > audible miss and black
> > >spot in the timing light strobe. Underway this
> > cannot be felt, unless this
> > >lack of ignition is only appreciable while underway
> > at high RPM.
> > >
> > >The prob was initially worse when I did the cams, I
> > did some testing and
> > >took it to Momentum due to ND coming up and time
> > constraints. We put in a
> > >brand new distributor, checked all grounds, swapped
> > in a newer coil and the
> > >ignition could still be seen cutting out on the
> > timing light. But after the
> > >coil swap the prob could no longer be felt. Drove
> > all the way down to CA
> > >prob free even with the miss still showing up on
> > the timing light. Shut the
> > >car off in the hotel in CA and upon restart car
> > missed worse than it ever
> > >had.
> > >
> > >Variables checked:
> > >WOT Switch in and out of loop, no difference.
> > >All TB Switches in and out of loop (unplugged TB
> > wire harness), no
> > >difference.
> > >A/C Idle switch in and out of loop, no difference.
> > >Knock Sensor in and out of loop, no difference.
> > >Timing good.
> > >Intercam Timing good.
> > >
> > >Things checked/replaced:
> > >Swapped Knockbox
> > >Swapped ICM
> > >Swapped FI computer
> > >Swapped Fuel Pump Relay
> > >Swapped Coil
> > >Swapped Coil Wire
> > >Brand new Distributor
> > >Checked and rechecked all under hood grounds
> > >Cleaned all under hood grounds
> > >Mixture setting has very little effect
> > >Timing has very little effect
> > >
> > >Components Changed wCams:
> > >Valve Springs
> > >Valve Guide Seals
> > >Intake Manifold
> > >TT Adjustable Cam Gear (set at 0 right now)
> > >
> > >Please help...these cams are no fun w/o letting
> > them unwind. I probably
> > >going to take the cams out in the next week or so
> > and hope the prob goes
> > >away with the stock cams. Arghh...Im at my wits
> > end.
> > >
> > >Shannon Fenton
> > >Telecom Resource Management
> > >Desk 206.266.6736
> > >Cell 206.953.6170
> > >Pager 206.541.7831
> >
> >http://internal.amazon.com/it/infrastructure/telecom/
> > >www.amazon.com
> > >
> > >
> > >--
> > >Email LIST problems to:
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> > >
> >
> >
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>
> =====
> Josh Wyte
> Momentum Motorsports
> 508-833-3024 After 5 pm EST
>
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