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Old 11-10-2012, 09:55 PM   #1 (permalink)
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Default Cant figure this out!

(sorry if there is another thread for this, I couldn't find anything.)
I have a 2002 Taurus 3.0L V6 OHV 133,000mi.

Im getting codes PO301, PO302, and PO316.
I know
PO301 is misfire cyl #1
PO302 is misfire cyl #2
PO316 is misfire in first 1000rpms

I have put in a new
Crankshaft positioning sensor
Coil pack
all plugs and wires
PCV valve and elbow

I have checked
injectors(all good)
IAC valve(cleaned and good)
for any vacuum leaks(cant find any, used carb cleaner method)

Any thoughts of why I am still getting these codes after doing the above?
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Old 11-10-2012, 10:12 PM   #2 (permalink)
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Have you checked your fuel pressure? (I'm notorious for asking this question in misfire threads). IIRC your pressure should be between 32-42psi at idle and the same or higher under load (not lower).

Could try the cigar smoke method to look for vacuum leaks. Get a super smoky cigar and blow the smoke into a vacuum line. Will go out of any leaks! I like it better than the other methods.
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Old 11-10-2012, 11:07 PM   #3 (permalink)
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You're going to have to do some functional tests here to help us out.

First do a test for strong spark on all cylinders, especially #1 and #2. If you need help, search YouTube for "How to perform a cylinder drop test".

Next check the fuel pressure as Sam instructed. It should increase to 40+ psi when you pull off the vacuum line on the pressure regulator.

Finally I would do a compression test on it. Has the engine had any history of overheating or shows any other signs of head gasket failure?
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Old 11-11-2012, 12:31 AM   #4 (permalink)
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Someone should really make a sticky for misfires.... There could be a quick write up with the drop test video, etc... It would help so many people what to try before posting here.
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Old 11-11-2012, 08:12 AM   #5 (permalink)
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Default

By crank shaft sensor are you referring to the one at the crankshaft??
You might check your cam sensor which is for engine firing order. They will also cause misfire if worn. This part should be Motorcraft only part. Dorman sensors are not good!!
Get a spray bottle of water and at dark try to spray around the electrical connections and plug wires. Any blue arcing will show you the way~~
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