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{ Scaring babies and little old ladies with open headers since 1964 }
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{ Scaring babies and little old ladies with open headers since 1964 }

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backfiring 350

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{ Scaring babies and little old ladies with open headers since 1964 } :: GARAGE :: Tech

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Post by 911TAZZ January 10th 2013, 9:29 pm

Was driving home from work and out of the blue the wagon starts missing and backfiring under load , well I checked the distributor and wires.all seem fine. The carb is a little rich but nothing out of the ordinary. Anything you guys think I'm over looking?
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Post by Nanook January 10th 2013, 10:16 pm

Got a crack in the distributor cap? Lock down tab is tight on the actual distributor?

Later,

Lee
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Post by 911TAZZ January 10th 2013, 10:21 pm

Didn't see a crack.lock down tab is tight.have another cap. will put it on and see if there's any change.
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Post by falconwagon62 January 10th 2013, 11:49 pm

Cam lobe/Valve issue wore also will do that, weak coil as well....
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Post by Brownie January 11th 2013, 12:53 am

I agree.... Check the coil. Had a Unlite cap do that once. The carbon was bad and worn down. Couldn't believe it still ran.
Good luck!
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Post by dieseldr January 15th 2013, 1:50 am

What year 350 with which dizzy in it? If still running points, that is likely your problem.... among other things.
I just saw your avatar picture, if it is that wagon, it might be the module under the dizzy cap.
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Post by 911TAZZ January 15th 2013, 3:10 am

Running a1985 350 with an Accel performance HEI distributor. It doesn't start missing until it warms up.
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Post by dieseldr January 15th 2013, 3:31 am

Heat related - breaking down module in dizzy? My guess. The old HEI modules got pretty cheap last I knew. A thorough going over of the HEI sounds like it is in order.
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Post by 911TAZZ January 15th 2013, 3:36 am

Thanks will do that.
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Post by Nanook January 15th 2013, 5:56 am

dieseldr wrote:Heat related - breaking down module in dizzy? My guess. The old HEI modules got pretty cheap last I knew. A thorough going over of the HEI sounds like it is in order.

Yeppers, I agree here. Those modules are a pain when they start to go south.

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