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Registered
Join Date: Oct 2001
Location: Redondo Beach, CA, USA
Posts: 78
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Ignition problems
Two cylinders are not firing. I replaced the spark pulgs and ignition leads. Whats the
deal? Thanks Eric |
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05-13-2002, 07:56 AM
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Registered
Join Date: Nov 2001
Location: New York, NY
Posts: 362
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Hmm the same two cylinders every time? Are they not firing at all? (i.e. if they never fire, the plugs will be wet and sort of clean from all the gas washing them off). If so, work your way backwards, swap the non firing plugs with ones from the firing cylinders, check your leads to make sure they're seated well, replace the distributor cap if it is old, check for play in your distributor shaft. Other sources of failure can be ground strap, CDI box, coil, etc but usually these are random misfires (not the same two).
Brad
__________________
73 911S Coupe sold |
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05-13-2002, 08:02 AM
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Registered
Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
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If its the same two cylinders my first guess is that you have switched (reinstalled incorrectly) a couple of the plug wires at the distributor. Check your plug wires against the firing order and correct as required. Cheers, Jim
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05-13-2002, 08:47 AM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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May guess is that the wires on the non firing plugs got swapped by mistake.
Joe |
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05-13-2002, 05:41 PM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Eric,
Test the two non-firing wires for end-to-end continuity ... they should measure 3000 to 4000 Ohms. Another rare possibility is defective, shorted spark plugs. I have seen new ones that were shorted!
__________________
Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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05-13-2002, 06:10 PM
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