Misfire solutions - TCCoA Forums

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post #1 of 4 (permalink) Old 03-01-2017, 02:52 PM Thread Starter
Join Date: Feb 2017
Location: Rockland County, NY
Posts: 6
Misfire solutions

Here's where I'm at with this one... Misfire cylinder 6 on 1996 3.8. I can feel the car lacking some power at the line, but power picks up at around 2500 rpm. I have changed the plugs, wires, coil, and ran seafoam through as to clean up my injectors. Pulled the cables to reset the system, but still im getting p0306 from the computer. Next I plan to do a propane enrichment check around the plug to check for cracks. It's cylinder specific so I doubt vacuum line as it would lean out the bank, rather that pointing to that one cylinder. Any other ideas for this one?
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post #2 of 4 (permalink) Old 03-01-2017, 03:20 PM
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Join Date: Aug 2007
Location: S.W. Michigan
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I had this problem with a 3 liter last month- replaced the plugs, wires, coil pack, and even two injectors- nothing. Gave up and sent it to the repair shop. In the end the problem was a faulty NEW spark plug.

Try swapping the number 6 plug with another cylinder and check if the misfire follows it.

1995 T-Bird. PI 4.6. Bullitt intake. Big MHS cams. 4,200 Dirty Dogg converter. Kooks headers. Full exhaust. 4" Drive Shaft. 4:10s.
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1997 Lincoln Mark VIII FX2 Sand Dune Machine.

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post #3 of 4 (permalink) Old 03-02-2017, 07:45 AM Thread Starter
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Location: Rockland County, NY
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I'll give it a shot and see if it work, thanks!
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post #4 of 4 (permalink) Old Yesterday, 08:31 AM
Join Date: Oct 2016
Location: NW of ATL
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One other thing that can cause misfire is a leaking intake manifold gasket. From what I understand, the coolant passage portion of the gasket can leak coolant into the combustion chamber and cause misfire.
If you have the old plugs, compare #6 to the rest and note if it looks as if it had been 'steam cleaned'. The coolant flash to vapor will make any deposits on the plugs get 'steamed' away.
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