[cmalove08]

we changed the spark plugs and wires on my stang last night everything was set up according to the ignition pack and now it wont start! i just found out that some models need half the banks on a diferent plug for reverse polarity is this true?

[bdcardinal]

no, they come that way from the factory on some cars, but the service part numbers are the same part number for both banks.

[MustangLX-5.0]

What year V6? if this is 05-09 then your in the wrong forum. I never heard about polarity and ignition...thats why I think its a 4.0.

can you be a little more specific? bdcardinal knows this cause he's a tech and has worked on 4.0's. I have never diagnosed CAN OBD's except maybe a few times.

[bdcardinal]

ford had different spark plugs on the banks on some of the waste spark cars. both the 3.8 and 4.0 are waste spark. Sean Hyland gave a good explanation in his book about 4.6's, but basically the other bank's plugs are designed differently to get the vehicle through the warranty/ emissions warranty period.

the replacement service plugs are the same part number as the warranty thing isnt a concern anymore, that and it would confuse the hell out of people.

EDIT: if none of that makes sense, its a combination of being sober and not having caffeine when i typed that.