Occasionally backfiring? Anyone else have this?

[TopherSho]

I assume this is what is being talked about

Thanks SHOdded,  i thought that might be it but wasn't sure. 

NEXT mystery ::
http://www.rockauto.com/en/catalog/ford,2010,taurus,3.5l+v6+turbocharged,1445050,exhaust+&+emission,oxygen+(o2)+sensor,5132

Brad says my primary O2's are sketchy ... but on the RA link above the closest thing i find to primary is ''upstream''.  any ideas?  since this is a race rig and DD i will pop for bigger cost/better quality pieces but i do not know which parts i need.. and to be honest if i should just replace all of them since i will be under there.

So far we are
6 new plugs to replace the 10k old NGK 6150's
6 new boots for the COP
2 new O2's for maybe 4 for good measure
..

thank you all in advance.

 

[SHOdded]

Primary = upstream
Secondary = downstream

When in doubt, go oem.

 

[TopherSho]

Primary = upstream
Secondary = downstream

When in doubt, go oem.

Thank you sir!

well all-righty then ..  I wonder if i should just buy them from the dealership. i will have to call a price qoute them.

 

[ZSHO]

I just opened one up for ya.!!  Nice made in Germany  Z 
SOLENOID VALVE - FORD  (BL3Z-9K378-A)
  $16.17

https://parts.levittownfordparts.com/oem-parts/ford-solenoid-valve-bl3z9k378a/?c=Zz1mdWVsLXN5c3RlbSZzPXR1cmJvLWNoYXJnZXImaT1LRjEzMzI1NSZyPWxheWVyXzIxJmE9Zm9yZCZvPXRhdXJ1cyZ5PTIwMTAmdD1zaG8mZT0zLTVsLXY2LWdhcw%3D%3D

 

[SHOdded]

Call up one of the online dealers for all the parts you need, discounted.  Levittown Ford, Tasca, and AutoNation of White Bear Lake are tops in the trade.

 

[TopherSho]

I just opened one up for ya.!!  Nice made in Germany  Z 
SOLENOID VALVE - FORD  (BL3Z-9K378-A)
  $16.17

https://parts.levittownfordparts.com/oem-parts/ford-solenoid-valve-bl3z9k378a/?c=Zz1mdWVsLXN5c3RlbSZzPXR1cmJvLWNoYXJnZXImaT1LRjEzMzI1NSZyPWxheWVyXzIxJmE9Zm9yZCZvPXRhdXJ1cyZ5PTIwMTAmdD1zaG8mZT0zLTVsLXY2LWdhcw%3D%3D

Thanks Z,  but i am 99% sure mines fine.