Re: Help! 16V High RPM Miss!

["David Guido" <guido_david@hotmail.com>]

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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