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I have an 06 Taurus with a vulcan 3.0L with about 120000 miles on it. A couple weeks ago it started to misfire and it came up with a P0302, P0351 code. Idle is not the best. I changed the coil pack, spark plugs and wires, all with genuine Ford parts. I cleared the codes, it ran fine for a day or two, and codes came back and started to intermittantly misfire again. I checked the plug wire connections to make sure I didnt connect 1 improperly. Everything checked out. I also changed the coilpack again with another Ford one. Cleared and came back again after a test drive. So I dug a little deeper and changed MAS, checked for vacuum leaks, took all grounds off that I could find and cleaned, and reconnected them. I did recheck the spark plug wires and found 1 with a cracked boot, causing a misfire. Changed that wire and checked all others,also pulled the plugs and cleaned and reinstalled. All plugs looked good. Cleared codes again and took out for another drive with obd2 reader attached. It ran good, then it misfired again. Not enough to turn check engine light on, came up P0351 only this time. Not sure where to go from here. I will list the freeze frame data, maybe I am missing something? Fuel Sys 1 OL Fault
Fuel Sys 2 NA
Calc Load% 95.3
ECT (°F) 186.8
STFT B1(%) 0.0
LTFT B1(%) -1.6
STFT B2(%) 0.0
LTFT B2(%) 0.8
Engine RPM 2195
Veh Speed 26
Spark Adv 15.5
IAT(°F) 37.4
MAF ( LB/MIN) 6.0
TPS(%) 44.3
O2S B1 S1(V) 0.050
STFT B1 S1(%) 3.1
O2S B1 S2(V) 0.155
STFT B1 S2(%) 99.2
O2S B2 S1(V) 0.115
STFT B2 S1(%) 1.6
O2S B2 S2(V) 0.100
STFT B2 S2(%) 99.2
Run time(sec) 1775
FP/VAC(PSI) 40.5
Command EGR(%) 0.0
EGR Error(%) -100.0
Command EVAP(%) 0.0
Fuel level(%) 1.2
Warm-up DTC CLR 1
CLR dist(miles) 9
Bar O(InHg) 30.7
Cat Te 11(°F) 1286.4
Cat Te 21(°F) 1286.4
ECU Volts 14.34
Load Value(%) 69.4
EQ Ratio 0.867
Rel TPS(%) 24.7
Ambient(°F) 27.4
I don't know what most of this means, any help is much appreciated! I am fearing a bad ECU.
 

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^^^ Agreed. Changed plugs on my long gone 02 Grand Prix GT 3.8 L. Ran like crap with bad miss. Pulled the new plugs and carefully inspected them. One had a hairline crack in the insulator almost impossible to see. Replaced that plug with another new one. Problem solved.
 

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I bought plugs and wires from a big box store once to do a tune up, car ran worse. Took those back, went to auto parts store and got proper parts, car ran much better. Where you buy parts matter.
 

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Isn't the PO351 a primary coil failure Been there and you need a new coil. Buy Motorcraft. This happened to me on my 2006. Read my post below.

 

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^+1. P0351= Ignition coil A primary/secondary circuit malfunction. Usually indicates coil pack malfunction. Replace with Motorcraft or Borg-Warner (BWD) coil only. Iirc, BWD available at Advance Auto Parts or O'Reilly Auto Parts.
 

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Don't try ohming it out because it didn't show bad for me. Also it could be broken wires or bad connection in the plug feeding the coil. It isn;t on the high voltage side it is on the 12 volt side into the coil.
 

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^+1. Primary/secondary resistance tests can be within spec with an ohmmeter, but still misfire under load. Btdt, lol!
 
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