302 stalling, won\'t idle, misfiring - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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Old 04-09-2005, 10:06 PM   #1 (permalink)
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302 stalling, won\'t idle, misfiring

Today I went to help out a buddy of mine with his '69 Mustang. Said he was having carb trouble and it would stall when stopped in gear. He knows pretty much nothing about carbs. The carb was totally out of whack so I set the float levels, fixed a problem with the secondary fuel bowl, idle mixture, fast idle, choke, and also set the timing. After that it ran much better. It was smoother and we took it for a test drive and it kinda acted like it wanted to stall when stopped in gear (would stumble and sputter occasionally but not stall. He said it was a million times better than it was before.

The engine is a fresh 302, Torker II intake, Holley 4150 (rebuilt by some carb shop or some such place), and a 'hot cam' not sure of the specs but you can definitely tell it had a somewhat radical cam.

I wanted to know the specs on the cam but he wasn't sure where the cam card was. He's gonna look for it in all his receipts. In any case, I was thinking maybe it was too much cam for the stock stall converter which was causing the problems with stalling in gear. Also were getting into issues where the idle screws were getting less effective. Was thinking we may have to drill holes in them.

So we start up the car again after it was off for a few minutes and it runs like crap. Wouldn't idle on it's own. Gotta feather the gas. I was thinking perhaps a vacuum leak, but I couldn't find one. Sounded like it was misfiring. All plug wires were good, cap and rotor good, point gap good. Timing 14* initial. I don't know what the problem is. It seems kinda like a vacuum leak but I didn't find any. I had to go shortly after that so I didn't get to look at it too long after it started running like crap.

Next time I go look at it I'm gonna check again for vacuum leaks, adjust all the rocker arms (think I hear one tapping, shouldn't cause it to run so bad but maybe he set some too tight), and if the problem persists perhaps swap my carb onto the engine to see if that makes a difference.

Any thoughts or things to try?
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Old 04-09-2005, 10:22 PM   #2 (permalink)
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302 stalling, won\'t idle, misfiring

car have an aftermarket ignition? ie. MSD?

check the carb, maybe something is staying open?

and re-check the rocker arms

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Old 04-09-2005, 10:46 PM   #3 (permalink)
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302 stalling, won\'t idle, misfiring

It's a new accel single point distributor with vacuum advance and an Accel Super coil. No MSD box or anything fancy. Timing is set to 14* initial. Haven't don't anything with the curve as we gotta get it idling properly first.

I strongly suspect the rocker arms may not be properly adjusted, from what he was telling me and the fact that at least one was making some noise.

I'm not sure about the carb. I adjusted everything like I have on other Holleys I've set up. I wonder about the quality of the rebuild. The floats are cheapo plastic ones, and the idle mixture screws feel a bit loose. That is to say they have a little wobble in them. Just seems a bit questionable as to the quality of the rebuild. May be worth getting a kit and rebuilding it to ensure everything is nice and clean and as it should be.
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Old 04-10-2005, 05:25 AM   #4 (permalink)
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302 stalling, won\'t idle, misfiring

Did you check the firing order??? Perhaps the cam needs the "alternate" order such as 302 vs 351?

Other than that, it does sound like a vacuum leak. Break out some carb cleaner and spray the intake manifold and carb base.
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Old 04-10-2005, 10:52 AM   #5 (permalink)
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302 stalling, won\'t idle, misfiring

Possiby a bad power valve? Or the wrong size in it for the vacuum you are holding at idle. Check with a vacuum guage a see what it is then pull the carb apart and see what's in it. Also be sure the floats are set right, had one doing similar things and the level was too high.
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