Strange 930 Starting Problem
07-25-2008, 10:53 PM
#1
Rennlist Member
Thread Starter
Strange 930 Starting Problem
My 930 won't start after sitting for a couple of hours unless I pull a spark plug wire. I pull a wire, it starts. I turn 'er off put the wire back on and she starts up. Let 'er sit for a while and she won't cooperate again. Why would pulling a wire allow it to start up? 
Anybody ever heard of such a thing...? TIA for help solving this nagging oddity.
Cheers, PDQ
Anybody ever heard of such a thing...? TIA for help solving this nagging oddity.
Cheers, PDQ
07-31-2008, 05:06 PM
#4
Burning Brakes
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So when it does start, you have it running on only 5 plugs (one wire removed). Shut her down, plug the wire back in, and she starts right up on all 6. Shut her down for 2 hours, then nothing again until you repeat the magical sequence.
This symptom doesn't make any sense. Got power to the coil at all times? And is your coil wire clean and in good shape? I would say check your coil resistance as well (for whatever the spec is). I'm thinking the coil is going south on you (or your CDI or MSD or whatever ignition system you have), creating insufficient spark to get all 6 plugs sparking enough to start the cold engine. Pull one wire, and the other 5 plugs now spark just enough to fire the beast up. Then, once warm running on 5 plugs and connecting the 6th back up would probably still start even though t he coil output is weak.
Oh, and don't forget to have good grouding on all components.
All just a big guessing game, by my 2 cents for what it's worth.
This symptom doesn't make any sense. Got power to the coil at all times? And is your coil wire clean and in good shape? I would say check your coil resistance as well (for whatever the spec is). I'm thinking the coil is going south on you (or your CDI or MSD or whatever ignition system you have), creating insufficient spark to get all 6 plugs sparking enough to start the cold engine. Pull one wire, and the other 5 plugs now spark just enough to fire the beast up. Then, once warm running on 5 plugs and connecting the 6th back up would probably still start even though t he coil output is weak.
Oh, and don't forget to have good grouding on all components.
All just a big guessing game, by my 2 cents for what it's worth.
07-31-2008, 05:46 PM
#5
Race Car
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Hope these resistance readings may help...
OK, here are the resistances
At the CDI connector with it unplugged
Coax to dizzy (green cable) is 570 inner to outer wire.
Brown to White (coil primary) is .7
Coil secondary (coil HT to either + or -) is 649
At the CDI box
31/1 to 31d is 0 (closed circuit)
31d to 15 is 672
31d to TD will charge briefly and then go to infinity (open circuit)
31/1 to TD also charges briefly and then goes to infinity (open circuit)
My CDI is a 930.602.702.00
Bosch number 0 227 300 004
OK, here are the resistances
At the CDI connector with it unplugged
Coax to dizzy (green cable) is 570 inner to outer wire.
Brown to White (coil primary) is .7
Coil secondary (coil HT to either + or -) is 649
At the CDI box
31/1 to 31d is 0 (closed circuit)
31d to 15 is 672
31d to TD will charge briefly and then go to infinity (open circuit)
31/1 to TD also charges briefly and then goes to infinity (open circuit)
My CDI is a 930.602.702.00
Bosch number 0 227 300 004
07-31-2008, 07:33 PM
#6
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