85 BII does some weird "stuttering"

deadatmind · Dec 31, 2010

Its always done this to a degree. I was hoping it'd stop all together when I ripped out the computer and dist. and threw in an MSD box to use the magnetic trigger from a new distributor. But now, sometimes while accelerating I don't get all the juice and it stutters like crazy. The only way I can describe it is when you talk in to a box fan on low and it chops your voice up. That's kind of what it sounds like with the jolting. It also does some bad surging and jumping when I'm cruising in gear and have my foot off the gas.

I removed and plugged all the vacuum lines at the tree in the back of the manifiold and plugged them off. All but the break booster and cruise control lines. Then cut the vacuum line at the front of the carb in half and put a T and ran the vacuum advance right in to there. Am I doing something wrong?

Thanks for reading guys. :icon_bounceblue:

deadatmind · Dec 31, 2010

Oh yeah, also

Happpy new year everybody! :icon_cheers:

84bluebronco2 · Jan 1, 2011

If you still have the feedback carb and tfi, check the tfi. My 84 did that for a long time then out of the blue quit.

deadatmind · Jan 1, 2011

Nope

84bluebronco2 said:
If you still have the feedback carb and tfi, check the tfi. My 84 did that for a long time then out of the blue quit.

Changed the distributor to that for the 2.8 in a 79 Mustang like the technical library told me to do. I tried out a stock DurasparkII module but I believe we fried that... So I went and bought a little black MSD Ignition box and a Blaster 2 coil. The MSD box plugs in to the magnetic pickup in the distributor.

So does this sound like my timing is off? Should I give it a compression test also? From what I said earlier, does my vacuum plumbing sound correct to anyone?

deadatmind · Jan 1, 2011

Nope

Also, it is the feedback carb. Just got a pretty good check, might buy a Holley 350cfm 2bbl next week. =D

Shran · Jan 2, 2011

Doesn't sound like a vacuum issue to me. Have you rebuilt the carb? Could have a plugged passage. I'd also look at your ignition system past the distributor - cap, rotor, plugs, and wires. Sounds like a miss to me.

85 BII does some weird "stuttering"

deadatmind

15+ Year Member

deadatmind

15+ Year Member

84bluebronco2

15+ Year Member

deadatmind

15+ Year Member

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