Re: just joined and need help - elusive misfire !

["Baden LP" <fantasybkb@hotmail.com>]

Thanks for the comments and welcome
I have fiddled with the timing and agree that specs often are not relevant 
to running of the engine. Car runs better, but still problematic at higher 
revs and under load.
Still thinking about it,....

Ian


>From: "Julie Macfarlane" <juliemac57@hotmail.com>
>To: fantasybkb@hotmail.com
>Subject: Re: just joined and need help - elusive misfire !
>Date: Tue, 31 Jul 2001 15:44:07 +0000
>
>Misfire is caused by timing. Move the dist advanced. I am using a 50mm tb 
>with an 85mm air flow plate. When timed to spec's I misfire as well.
>I run about 3 deg off and the power is there & no misfire.
>
>PS... Welcome to the list. Drive safe, but have fun!
>
>Julie Macfarlane
>(Web Developer/Project Manager)
>Albany NY
>'81 8v-FF (FronkenMom)
>'81 16v-2A (FronkenDad)
>ICQ: 7704980
>
>
>
>>From: "Baden LP" <fantasybkb@hotmail.com>
>>To: scirocco-l@scirocco.org
>>Subject: just joined and need help - elusive misfire !
>>Date: Tue, 31 Jul 2001 07:11:56 +0000
>>
>>Hi all,
>>I am hoping someone here can help with my misfiring scirocco...?
>>
>>Here's the gen:
>>
>>Stock 8 v engine (1.8 carb EX) running with Weber conversion, tubular
>>exhaust manifold and free flow system.
>>
>>Car was running fine upto about 2 months ago (it then had the Pierburg 2E2
>>carb). It also had new fuel lines then and ran fine with them. Started to
>>develop a misfire at higher revs and under load, sometimes so bad that it
>>stalled the engine.
>>
>>Initially thinking it was the carb, this has been replaced with a known 
>>good
>>s/hand weber (its jetted for a 1.6 not the 1.8)- but that I feel is not a
>>major concern ...as the problem persisted
>>
>>In attempting to solve the misfire I have:
>>
>>replaced coil
>>new fuel filter
>>replaced fuel pump
>>plugs
>>leads
>>cap
>>checked rotor arm for resistance (within Haynes tolerance (1.05k ohms)
>>Swapped ignition unit for a spare
>>cleaned up contacts on coil and rewired some suspect wiring
>>cleaned up contacts on alternator that supply 12v (I read somewhere this
>>could also cause problems)
>>stripped, cleaned and reassembled dizzy
>>
>>What else?????
>>
>>
>>The coil gives a 1-2sec reading of 6v falling to 0 at the coil with 
>>ignition
>>on (Haynes says it should fall from 2v - is this a problem?)
>>
>>If I then earth the central contact of the dizzy multiplug (as in Haynes ) 
>>I
>>get a voltage of about 2mV steady across the coil with the ignition on - 
>>not
>>the 5-6 V Haynes suggests. Again - anyone know if this is a problem ??
>>
>>(For these voltages - I checked on another rocco and they were the same 
>>???)
>>
>>I have also noticed if I advance the timing, the misfire range moves lower
>>down the rev band, but car accelates more smoothly - i.e. I get a lumpy
>>cruising at about 40 mph but Ok acceleration. If I retard the timing a 
>>tad,
>>its the reverse situation (OK cruising, lumpy acceleration).
>>
>>AM I missing something here?
>>
>>ANY help appreciated!! I love the car but its driving me crazy!!
>>
>>Ian
>>
>>1987 Scirocco Scala (the white one!)
>>
>>
>>
>>
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>


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