Need Troubleshooting Tip Please!! - Team Camaro Tech
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post #1 of 8 (permalink) Old Nov 30th, 05, 12:29 AM Thread Starter
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Need Troubleshooting Tip Please!!

What could be some of the main causes of a cylinder misfiring (assuming that the plugs and wires are all good and the timing is set correctly)? Please note that it was first assumed that bad gas was the culprit, but the trouble seems to repeatedly occur on the same cylinder

When you buy an American car, you provide work for a man and his family for three months. -Jay Leno
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post #2 of 8 (permalink) Old Nov 30th, 05, 04:36 AM
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Re: Need Troubleshooting Tip Please!!

carbon deposits on the piston
or incorrect valve timing


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post #3 of 8 (permalink) Old Nov 30th, 05, 02:34 PM
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Re: Need Troubleshooting Tip Please!!

Try checking it in the dark with the hood up and the engine running. If you have a spark going someplace other than the plug you should be able to see it.

69 RS 355 Tremec 5-Speed 4.11's
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post #4 of 8 (permalink) Old Nov 30th, 05, 02:45 PM Thread Starter
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Re: Need Troubleshooting Tip Please!!

The engine was given a complete tune up just a few days ago.
(New rotor, dist cap, wires, plugs, air filter, coolant flush, & oil change)
The trbl seems to only be on cylinder #5

After double checking to make sure the plugs were all gapped correctly and the wires were all properly seated on each plug and are all in the correct firing order, we're starting to think that its a valve problem, so we're gonna try a compression test first and see how that goes..Thanks

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post #5 of 8 (permalink) Old Nov 30th, 05, 03:10 PM
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Re: Need Troubleshooting Tip Please!!

Make sure you dont have a vacume leak.The transmission and brake booster pull vacume from a fitting on the intake runner for #5 and #8 if one if the hoses are off it will cause it to skip at idle.If its an A/C car there is a canister in the drivers fender that ahs a hose running from the same place on the intake.

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post #6 of 8 (permalink) Old Nov 30th, 05, 03:53 PM
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Re: Need Troubleshooting Tip Please!!

Broken valve spring(s)?
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post #7 of 8 (permalink) Old Dec 1st, 05, 01:36 PM
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Re: Need Troubleshooting Tip Please!!

Quote:
Originally Posted by garfield
.........so we're gonna try a compression test first and see how that goes..Thanks
If you've already done a good tune-up and still have a misfire, then a compression test is always the next order of business.

When I was in the trade full-time, when a customer would bring in a mis-firing car for a tune-up, we would ALWAYS do a compression test before starting the tune.

Dave F. in Rhode Island
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Bought my first big-block Chevy in 1970
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post #8 of 8 (permalink) Old Dec 1st, 05, 06:00 PM
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Re: Need Troubleshooting Tip Please!!

What is this mystery motor and what is it installed in?

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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