455 sputters when accelerating - Pontiac GTO Forum
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post #1 of 12 (permalink) Old 05-04-2011, 06:10 PM Thread Starter
 
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455 sputters when accelerating

hello. i have a 69 gto with a 455 ho with m21 4speed. 800 cfm eldelbrock carb,
msd distributor coil and 6A ignition box. hooker competition headers etc.
my question is why would it sputter while accelerating? is it my total advance? or fuel pump? or how i have the carb set up? it idles fine and coasts fine..

any input would be appreciated... thanks

69 gto with a 455 HO
video of the beast runnin
http://www.youtube.com/watch?v=hkpC9y92tBk
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post #2 of 12 (permalink) Old 05-04-2011, 06:37 PM
 
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Originally Posted by tyler t View Post
hello. i have a 69 gto with a 455 ho with m21 4speed. 800 cfm eldelbrock carb,
msd distributor coil and 6A ignition box. hooker competition headers etc.
my question is why would it sputter while accelerating? is it my total advance? or fuel pump? or how i have the carb set up? it idles fine and coasts fine..

any input would be appreciated... thanks
define sputter
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post #3 of 12 (permalink) Old 05-05-2011, 04:25 PM Thread Starter
 
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when i accelerate the engine violently shakes and has no power.. when i let off it has power again so i have to ease the throttle very gently

69 gto with a 455 HO
video of the beast runnin
http://www.youtube.com/watch?v=hkpC9y92tBk
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post #4 of 12 (permalink) Old 05-05-2011, 05:06 PM Thread Starter
 
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it was my coil takin a crap... again... i hate msd....

69 gto with a 455 HO
video of the beast runnin
http://www.youtube.com/watch?v=hkpC9y92tBk
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post #5 of 12 (permalink) Old 05-05-2011, 05:14 PM
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Run a magneto instead.
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post #6 of 12 (permalink) Old 05-05-2011, 05:25 PM Thread Starter
 
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if only i had the cash :/

69 gto with a 455 HO
video of the beast runnin
http://www.youtube.com/watch?v=hkpC9y92tBk
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post #7 of 12 (permalink) Old 05-05-2011, 05:41 PM
 
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Tyler, you need to figure out WHY your coils keep crapping out. What kind are you using, is the wiring correct, do you need a "ballast resistor", or are your coils just coming from a "bad batch"????? E



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post #8 of 12 (permalink) Old 05-05-2011, 06:26 PM Thread Starter
 
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i have another thraed for that exact problem.. i know the wirings correct.. i even have spoke with a msd service tech over the phone... the only thing the guy said is the wont look at my msd box free of charge cause it not under warranty and that i had a bad coil.
im using msd blaster 2.. i tried blaster 3 but it had the same issue... if i had the money for a new distributor id eliminate the msd problem all together.

69 gto with a 455 HO
video of the beast runnin
http://www.youtube.com/watch?v=hkpC9y92tBk
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post #9 of 12 (permalink) Old 05-06-2011, 01:07 PM
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I'm with Eric on the balast restistor. Chrysler used them on their electronic ignitions (well they used them on points cars too) they regulate voltage to the coil and it will act as a "fuseable link" in the ignition system so if for some reason there is a spike it will blow the ballast instead. I always ran a "double" which actually was just two built into one, and when I blew one I could plug in the spare.

Is your coil hot to the touch after you drive? I'll bet it is....
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post #10 of 12 (permalink) Old 05-06-2011, 03:47 PM Thread Starter
 
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not too hot to touch. just as hot as any thing else in the engine compartment

69 gto with a 455 HO
video of the beast runnin
http://www.youtube.com/watch?v=hkpC9y92tBk
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