Re: Help! 16V High RPM Miss!

[josh Wyte <josh_wyte@yahoo.com>]

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
> >
> >
> >--
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> >
> 
>
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=====
Josh Wyte 
Momentum Motorsports
508-833-3024 After 5 pm EST

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