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Old 05-30-2015, 09:24 PM   #1
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Misfire? / Stutter

If you've done the SeaFoam through the intake or similar cleaners you'll know the feeling I'm speaking of ...

So I have this low RPM stutter. Similar to a misfire I can't say it is a misfire.

I've replaced/swapped with good parts,
MAF
Plug Wires
Plugs
Coil
Injectors
Tune (return to stock + change AFR for E-85)

Nothing has made any difference. Not even a little.


Far as my last datalog shows, Fuel Pressure holds 55 PSI (+/- 3 PSI). Exactly where I have it set. That is all the way through the RPM range, so I doubt any problems are there.
Compression is 180 PSI across all.


I'm stumped. Everything I think it is (ignition) I've replaced and it's made no difference. The pigtail is perfect and everything is getting good strong spark. But the way it runs says it's not.


Ideas?


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Old 05-30-2015, 09:42 PM   #2
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No codes ?? Maybe bad gas.
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Old 05-30-2015, 10:03 PM   #3
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Codes are irrelevant. Trust me.

Could be bad fuel. It'd be the first time in 8 years though.
I'll have to open the tank and scoop a sample ...
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Old 05-30-2015, 10:12 PM   #4
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Duratec or zetec?
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Old 05-30-2015, 10:13 PM   #5
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zetec
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Old 05-30-2015, 10:20 PM   #6
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High miles?
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Old 05-30-2015, 10:28 PM   #7
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12,000'ish
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Old 05-31-2015, 03:54 AM   #8
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More description might help.

Happens only at idle? -or between gears (mtx right?) -or during load, take-off, -or also during 55-mph cruise? Original recipe, extra crispy or oven baked?

Your answers might not help much, but more descriptions might help spark an idea with someone.

Drag chute deployed and still dragging behind ya?

First guess = spark plug health, fuel flow, fuel filter, air filter, vac leak...
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Old 05-31-2015, 11:09 PM   #9
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I'm saying it has to be something mechanical, ******' awesome ...
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Old 05-31-2015, 11:46 PM   #10
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Thinking of timing/valve possibilities despite the compression numbers or are you worried about bottom end?
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