Car has a 3 liter v6 and cylinders 1, 3, and 4 are misfiring. Codes are p0351, p0353, and p0354. I've checked the voltage repaired the wiring to the (COP) which all now have 12 volts, but all 3 cylinders still misfire. Vehicle has a new PCM was installed before I acquired the vehicle. I've also swapped out each of the (COPs) on all 3 cylinders with other (COPs) and its still misfiring. Im out of options and scratching my head. Can anyone advise something new to try?

 

u have 12v on one wire and a ground pulsing on the second wire do u have them both?

 

yes it is

 

Mine misfired had to get head rebuilt, replace water pump, camshaft seals and rocker arm assembly. Apparently there is issue with rocker arm assembly and when not caught and fixed it causes domino effect. all under manufacturer warranty mine 2010 47k mile

 

After rechecking every thing over 4 time i decided to go to a junk yard and get a ecm ( i got the same part # or id # that the car calls for )for the heck of it and what do you know it fixed the problem. How ever another has came up now i think it has gone into security more after 3 starts and the car will not start it is not getting signal to the starter Now ive talked to 3 dealers 1 says ALL ecm's have to be programed to the car 2 say's they do not so im at a stumped point again and yes i have checked the starter and it is working properly anyone know witch is the truth ?

 

the car has programed pin numbers into the computer u can swap them put the old one back on

 

If you can get the SKIM and the key from the same car as the PCM (ecm) swap into your car all good. If not the Dealer will be needed to program your "new" one.
Sentry Key Immobilizer Module is located in the steering column at the key switch. It must match the PCM, and you can tape the key to it. This would avoid having to replace all key locks.