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Old 02-05-2003, 05:14 PM
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Post Dead miss

New 350 running really bad. It has a really bad miss. Checking for problems this evening I found that only 4 of the cylinders are firing, all spark plugs are sparking. I pulled each plug wire off while the engine was running and cylinders 8 3 5 2 would not change engine sound, indicating these are not firing. Cylinders 1 4 6 7 indicate they are firing, engine changes rpms & sound when wire was pulled off. Every other cylinder is firing as far as the firing order.

Any ideas, please help. It's making me crazy

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Old 02-05-2003, 05:22 PM
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Have you checked the compression?
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Old 02-05-2003, 05:24 PM
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what ignition system are you using? you are only firing every other plug, it isn't an old mallory dual point is it?
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Old 02-05-2003, 05:27 PM
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Had problems with the dual-point in my mustang last year. Bought a Mallory Unilite instead, best money I've spent since the 3.70 gears.
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Old 02-05-2003, 06:20 PM
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Ignition is HEI stock chevy dist. Haven't done compression test yet.

It seem kinda odd that every other cylinder was firing,
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Old 02-05-2003, 09:36 PM
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I would look at the induction system 1st. What is common to all missing cyls??? 2 3 5 and 8 are all on the "high side" of the dual plane manifold. 1 4 6 7 are on the low side. I'm looking at my old Edelbrock 3cbx manifold right now. 235+8 are fed from the left (driver) side, it also has the vac fittings on that plane. Look for vac leak on the fittings, put vac caps on the ports to eliminate possible vac leaks until testing is done. Suspect lean condition from the carb or gasket. Look at the base gasket and make sure its on the right way. If its on backwards it will suck air from under the carb. Use your mechanics stethascope to listen for vac leaks. Check carb by putting a little gas in a small bottle (those plastic squeeze kinds that have a screw on long neck, like the ones for your air tools) With the engine running, drip or squirt some gas down the "lean side", idle should smooth out if its a lean side problem. If the intake gasket is damaged on just one intake port, it can cause that whole side to lean out. Poss carb circuit? Blow it out with air or rebuild it. REMEMBER Gas is dangerous if your not careful here. Just use common sense with the gas!!! If anything bad happens here (fire), you didnt hear this from me!!!
Also check for vac leak into brake booster. Pinch off hose with long nose vice grips to test.

[ February 06, 2003: Message edited by: 2-manytoyzs ]</p>
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Old 02-06-2003, 01:28 PM
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Thanks 2-many, thats what it seems like, I'll try that this evening.
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Old 02-08-2003, 06:42 AM
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I found the problem, thanks for the replys.

The problem was the intake gaskets onthe left bank on 3 & 5. This was causing every other cylinder to be dead and not fire.

Very strange, I've never had this problem before. I used SCE gaskets, which no more, they seperated like they were two gaskets put together. So needless to say I won't be using SCE gaskets.

Thanks again guys.
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