Tuning question...
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Senior User
Joined: Mar 2004
Posts: 375
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From: East TN.
Tuning question...
I am trying to tune on the 390...so I would like to check the timing. I have an edel 600 1406. I disconnect the vac. advance hose from the dizzy and the engine quits. No matter which vac. port I plug the hose into the truck will not stay running. Is there something simple I'm missing here or do I have problems. The truck is not running well at all...Its very hard to start and will even at times back fire through the carb. I've replaced the plugs to no avail, and have backed the idle screws out a turn and a half, then wanted to check the timing. Any help would be greatly appreciated. Corey
Lead Driver
Joined: Jan 2003
Posts: 9,893
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From: Ohio
Hmmm, if you unplug the dizzy and it quits, it sounds like you have it plugged into MANIFOLD vacuum?(below the throttle plates) and thus it's pulling timing IN and once you unplug it, it allows it to drop back to not enough to run.
Plug the fitting at the carb, loosen the dizzy and try to start motor. Can you get it to start by moving dizzy around slightly? Leave the idle mixtures screws out at 1 1/2 turns(from bottomed out). Once truck is running, set the timing to 10 degrees.
Once you get it started, timing at 10 deg, and idling at 700 rpm you can fiddle with idle screws for max idle speed(usually start turing them each in slowly til it speeds up slightly). Do each so that they are about equal setting(turns).
Plug the fitting at the carb, loosen the dizzy and try to start motor. Can you get it to start by moving dizzy around slightly? Leave the idle mixtures screws out at 1 1/2 turns(from bottomed out). Once truck is running, set the timing to 10 degrees.
Once you get it started, timing at 10 deg, and idling at 700 rpm you can fiddle with idle screws for max idle speed(usually start turing them each in slowly til it speeds up slightly). Do each so that they are about equal setting(turns).
Thread Starter
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Senior User
Joined: Mar 2004
Posts: 375
Likes: 0
From: East TN.
Hey Larry thanks for the response...I figured it out. Yours truly the moron forgot to pull the vac. hose off the dizzy when initially timing the motor, so it was all screwed up to begin with. I retarded it until it would run then tuned the correct way!! Wow sometimes I wonder about myself...
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