Thread: 930 misfire
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jwasbury jwasbury is offline
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Join Date: Jan 2008
Location: Weehawken, NJ
Posts: 3,627
Agree with Helmsy to check fuel pressure. Follow the standard "tune-up" procedures:

Verify CIS system and control pressures are within spec
Inspect distributor cap and rotor, replace if suspect
Inspect spark plugs and wires, replace if suspect
verfiy ignition timing is within spec
verify operation of advance/retard mechanisms as equipped

tools needed:
CIS fuel pressure gauges (best price from JC Whitney ~$60 IIRC)
Timing Light ~$35 from your FLAPS
MityVac to pull vacuum or apply pressure to vacuum pod on distributor and to vac/boost port(s) on CIS Warm-up regulator ~$30 from your FLAPS

Every 930 DIY wrench should have these items in his/her toolbox
Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
Old 05-21-2012, 06:51 AM
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