Engine Missing - Team Camaro Tech
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post #1 of 8 (permalink) Old Oct 16th, 02, 07:17 AM Thread Starter
 
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Just rebuild a 350 for my 69 Camaro and it runs great except for a slight miss. I have put about 500 miles on it so far, and the timing is set. If the valves are to tight would that cause the engive to miss? Does anyone have any suggestions?
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post #2 of 8 (permalink) Old Oct 16th, 02, 08:11 AM
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Did you put new plug wires on it as well?


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post #3 of 8 (permalink) Old Oct 17th, 02, 05:38 AM
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You may want to check the #5&7 plug wires. They may be crossed. This is a very common mistake with both BB and SB engines. When you think you have it right, check them again. If they are absolutely correct and you still have a miss, remove one plug wire at a time. When the cylinder with the miss is identified, then you can check the plug, wire, and valves for the cause. I would do the 5&7 thing first.
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post #4 of 8 (permalink) Old Oct 17th, 02, 09:33 AM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by Spames:
Did you put new plug wires on it as well?


<HR></BLOCKQUOTE>

Yes, do you have any other suggestions?
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post #5 of 8 (permalink) Old Oct 17th, 02, 09:34 AM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by Shakenbaker23:
Yes, do you have any other suggestions? <HR></BLOCKQUOTE>Thanks I will check that!

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post #6 of 8 (permalink) Old Oct 17th, 02, 10:26 AM
 
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Could be a cracked spark plug.
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post #7 of 8 (permalink) Old Oct 18th, 02, 08:07 AM
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I've got the same deal with my truck.

Rebuilt the HEI, new MSD wires, new AC Delco plugs gapped @ 45, new cap and rotor, still a miss every once in a while. And I'm SURE 5 & 7 aren't crossed, I'm nitpicker when it comes to that.

I've just learned to live with it.

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1969 Base Camaro
Vortec 355, Perf. RPM, Demon Carb., TH-400
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post #8 of 8 (permalink) Old Oct 18th, 02, 11:38 AM
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You may want to try a different brand of spark plug as sometimes a specific brand of plug cannot handle the dynamic compression.

I use to work for a gas station having an AC Spark plug cleaner using liquid sandblast and fresh water rinse. Remember the blue machine?

After cleaning, you would screw the plug into a fitting which was pressurized with shop air and attach a plug wire onto it. Hit the button to fire the plug, see the reflection of the spark in the mirror and turn up the air pressure in the chamber to see when the plug would misfire. If the air regulator knob could not be turned out of the red zone, bad plug.

I use Autolite, but, everybody is partial to a brand of their choice. Champions and AC's misfired, but, Autolite always works for me.

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Everett "OBJECTS IN THE MIRROR DISAPPEAR UPON RAPID ACCELERATION"
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