Need help with 389 tri-power - Pontiac GTO Forum
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post #1 of 5 (permalink) Old 12-25-2012, 11:21 PM Thread Starter
 
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Need help with 389 tri-power

cAN ANYONE TELL ME WHY THIS MOTOR IS IDLING SO RUFF? THE DISTRIBUTOR HAS BEEN CAPPED OFF BY THE MECHANIC AND THE
VACUUM PORT AT THE BACK OF THE CENTER CARB IS BEING USED
FOR THE VACUUM MODULATOR ON THE TRANSMISSION. THIS IS A NEWLY REBUILT MOTOR AND INTAKE SETUP. I WOULD APPRECIATE
YOUR ADVICE, INFO!
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post #2 of 5 (permalink) Old 12-26-2012, 08:59 AM
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If the mechanic 'capped off' the distributor and doesn't know why it's running so rough, you need another mechanic. There are lots of threads on this forum that deal with tune up issues, and a lot of information on the web. Depending on your mechanical savvy, you may need to do a little or a lot of homework. Start with basics: ignition dwell, timing, carb mixture, firing order, vacuum leaks, etc.
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post #3 of 5 (permalink) Old 12-26-2012, 10:30 AM
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You need to share the vacuum going to the modulator with the vacuum advance, Place a "T" inline and run a new vac tube to the distributor.

Then follow Lars' advice on fine tuning;

http://www.gtoforum.com/f50/gto-tuni...up-tips-13052/

Randy


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post #4 of 5 (permalink) Old 12-26-2012, 03:37 PM Thread Starter
 
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Yes, that was the first thing I did this morning and ta da! Now I just need to adjust the mixture screws, HOPEFULLY. Took her for a test run and man she darn sure ain't no single 4 barrel 389 anymore, chirps second gear with out even trying.

To all that have responded to my post, threads, questions or whatever you computer people call them or whatever the heck they are. GOD BLESS YA! HAPPY NEW YEAR!
THANK YOU VERY MUCH! I wish I knew how to post pics of the project! She's SWEET!
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post #5 of 5 (permalink) Old 12-27-2012, 08:30 AM
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After clicking "add reply" scroll down to "manage attachments" then download the pictures to the forum and they will appear as an attachment in the thread. Pictures that are around 600 pixels wide are easily downloaded.

Randy


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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring
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