Thunderbolt timing.. Need to order quick.

[BajabossJD]

Hi Guys,

Well, after buying a new coil today, I still didnt have a spark. I posted a week back telling the story about the ground cable coming off the batter while running fast.

Well I tested the + tive side of the coil with the ignition on and I have 12volts when I grounded my Multimeter. I then checked the white/red wire coming from the distributor ( I disconnected the bullet connector) and I have no voltage. I also tried the white red wire coming out of the Ignition and had no voltage. Any other tests to confirm its my Thunderbolt?

I found a good working Thunderbolt with a 24r on it. The one I am taking off is a 20r. Its for a carbed 454 that was setup pretty conservative. Will the 4 degrees of timing make that big of a difference at 4k rpm? I really want to get on the water this weekend.. Havnt been out since the 4th.

Thanks,

Joe

 

[Druff1]

Re: Thunderbolt timing.. Need to order quick.

I had the same issue, (Thunderbolt V, 454)... Ended up being the ICM.. Mine was mounted on the back of the distributor, others may be mounted to the exhaust riser. What sucks is that it's a $300 part, and I don't know if there is anyway of checking it. Hope this helps.