Topic: no spark !!
in Forum: C3 Engines
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Thanks - will let you know the results.
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IF you are dropping to 6 volts when cranking, see if you have the same voltage drop at the battery. If so, you could just have a bad battery. Or the starter is pulling WAY too much power. Either way, the engine would be cranking slowly.
See if you have enough voltage at the battery connection at the alternator when cranking. You need at least 9 volts at the dist and the alt both. If not, but it cranks okay and the battery voltage at the battery is okay during cranking, then check the connectons at the starter and the fusiable links coming off of the starter.
If the alt voltage is good, but the dist voltage is low, look at the ignition switch. At that point the suggestion of running a jumper from the alt to the dist would be a good easy test.
Lifetime MemberLanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 828
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
try getting a new battery. sometimes with a dead battery such as yours a jump wont give it enough juice to start. i have had this happen on a couple of cars and once a new battery was in there was no problem. one car ran to auto store and would not start when i came out and it was showing spark. turned out the battery was bad and i even tried jumping it. good luck
LIFETIME MEMBER #97
THE DYNAMIC DUO
THE DYNAMIC DUO
OK, here's the update. Replaced the ignition switch - still no spark. I tested the volts at the distrib. while jumping & the reading was 13 while on & then falls to 6 while cranking. I received the same readings while jumping from the alt to the distrib. I then removed the battery & noticed some corrosion. I cleaned that up. I went to the store & purchased a new battery on the advise from eddie20875 (thanks). I replaced the battery & still no spark 
. I performed the same tets as above & the readings are now 11.75 while on & 9.50 while cranking. I hope this info helps. By now I think I've replaced everything except the wiring. While it's been fun working on my baby, it's getting frustrating.
. I performed the same tets as above & the readings are now 11.75 while on & 9.50 while cranking. I hope this info helps. By now I think I've replaced everything except the wiring. While it's been fun working on my baby, it's getting frustrating.Do you have spark at the plug wire terminal at the distibutor? Or no spark at the end of the wires? Need to maybe start to check for ground problems.... is the little wire that attaches to the coil with the 1/4" bolt grounded? and make sure that where the connectors go on are not bent over and not making contact.
John
I have no spark at the plugs. How should I test for spark at the distrib ? The little wire appears to be grounded & I don't see any of these connectors being bent. Is there a test I can do with my digital meter to make sure it's grounded properly ?
Lifetime MemberLanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 828
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
is it possible you installed a bad ignition module? maybe too much of the diseletric grease or not enough? this is a strange problem. sorry that the battery advice didn't work
LIFETIME MEMBER #97
THE DYNAMIC DUO
THE DYNAMIC DUO
I bought the ignition module new from the parts store...I guess I could do a check on it to make sure it's good....I didn't use any grease...should I have ? where does the grease go...what is it used for ? no problem on the battery, I needed a new one anyway & right about now I'm willing to try all options.
The greas goes on the back of the module, its helps tramsfer heat from the module to the case, you might double check the contact and seal between the coil and the cap
in Forum: C3 Engines
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