I've been tuning on my 76 highboy 360 c6 for what seems like forever. Carb rebuild, set timing(12 degrees),new plugs, Vacuum guage tuned (16lb) Runs nice just has a hesitation off idle while driving that you can throttle threw that I have been trying to tune out with no luck. I thought it was something to do with my accelerator pump but no matter how I adjust it it still hesitates. Tonight I put on a tach so at least I would know what rpm its sputtering at. When I went to hook the wire up to the coil I noticed there is a plug end coming from the coil that was unplugged going to what looked like a AAA battery sized thing. I have no idea what this is. I plugged it back in and took it for a drive hoping this fixed my prob, but it was worse. now it sputters bad at all rpms over 1000rpms going down the road. I unplugged it but it is still doing it. I'm sure I must have a bad connection somewhere in my ignition coil.

My question is would a bad coil cause hesitiation? What is the AAA sized thing on te side of the coil that was unplugged? I think I'm gonna lose my mind trying to get this thing to run perfect. Ive spend over $100 in fuel just in tuning and test driving this thing lately. Please help me and my truck out guys!

 

Is your vacuum advance connected? if so, where is it connected? is it functioning?

 

Is your choke connected?

 

vac advance is hooked up to ported vac on carb by the choke assembly. The choke is connected but the thermostat peice is worn out so I turned it clockwise until butterfly is fully open at all times. Truck does it cold or hot so I doubt its choke related. It starts easy but I am going to get a new thermostat for he choke before too long.

 

Why are you convinced the coil is causing problems? What data do you have that actually points to an issue with the coil? The only way to truly quantify the coil's performance is to ring it and watch it on an oscilloscope (impractical), or measure the primary and secondary winding resistance (highly practical). Since you haven't done the latter, you have nothing that tells you anything about the coil.

Many folks are eager to blame the coil because it is cheap to replace, and easily accessible. Neither are reasons to start diagnosis there.

An engine is a complex system consisting of many components that must operate in harmony. Theoretically anything could cause hesitation. The ignition coil is seldom the cause. The coil has little sense of RPM. It either works or it doesn't. Hesitation is almost always a vacuum issue, timing issue, or fuel delivery issue.

That's an ignition noise suppression capacitor. It's job is to keep the high-frequency switching from the ignition coil primary winding out of the radio power supply. It has nothing to do with your problem.

 

I'm 100% positive the coil has a bad connection causing my cutting out problem at all rpms because it didn't do that until I put the tach on last night. It got late on me so I didnt have time to fix it. Im sure that is the cause for that problem. Just wondering if maybe a coil or other electrial could cause my off idle hesitation?


I got a new coil from NAPA today for $22 I figured might as well replace it sense the old one is prolly the original. I asked about the thing on the side of the coil and they said the same thing about the noise suppresor.