Try cleaning the MAF sensor.......use the correct spray cleaner....don't touch the wire....more help on the way if that doesn't help...

When you swapped injectors did you check the o-rings? Does the engine run rough like it's misfiring?
 

My only thought is the IMRCs. Do those cylinders have any vacuum ports or anything different from the rest? I'm purely spitballing here, but could a bad intake manifold gasket between the two cause a rich condition but not a poor idle?

Darren,
As a matter a fact i did do a compression check and this is what i got, 1=200  2=200  3=200  4=200
5=190  6=190  7=195  8=195 that was PSI. I havent done a leakdown test but im leaning towards the IMRCs too so i think im gonna clean them soon..

Thanx everyone.

Hey josh that link is not working!! 😱

Thank you again josh. It works now, ill keep you guys updated 👌

65svt

When it throw the CEL code?  Prior to that, was it running and driving ok?
Had you done any work on it before the code?
Are you using a K&N type air filter?
 

do you have the stock fuel pressure regulator or aftermarket? stock regulator can't be adjusted....what about doing a fuel pressure test and see what reading you get?  i don't know off the top of my head what is considered "normal" pressure but, could find out easy. vac leak(s), fuel, MAF, injector issues always are associated with this CEL code.........i read too that one guy had a bad EGR gasket....not sure if i'm helping but, i chased vac leak(s) on my 98 F-150 for awhile and with the help of another forum, solved it............two 90 degree rubber vac elbows, under the upper intake that support the PCV valve were cracked, rotted and had a hole in them.......drove me mad.....$20 fix and it was purring again...

Had the same vac leak on my 2000 Expedition as josh-kebob describes. Along the lines of Ron68's reply about causing a too lean code to throw, if the computer thought it was lean because of a vacuum leak on the other two cylinders on the bank, and fattened up the fuel curve to compensate, wouldn't the cylinders without the vacuum leak get fuel washed plugs?
I'm just throwing out "what-if" scenarios here..... a buddy who is a jet mechanic and myself can feed off one anothers suggestions and figure some pretty obscure stuff out.
*Edit... just re-read the OP post about the rich code.... too early for me, sorry.
I'm still leaning towards something non computer related being the culprit.

Last edited by darren (6/07/2013 5:58 AM)

UPDATE LONGGGGGG!!!  

Ive been doing alot of testing for RICH ON BANK 2, I checked the IMRCs to see if they were opening at 3200 rpm and to my surprise they were not opening at all but the weird part was that i wasn't getting any codes for that, so i got that fixed and the IMRCs work how they should now The issue was that i was missing a ground for the IMRC controller. I test drove it and I dindnt feel any hesitation until it started to smoke (wasn't sure if it was blue or white smoke ) on acceleration on any gear so I parked it checked oil for coolant and checked coolant for oil and everything was normal. I remove plugs to check them they were normal except for #5 and #7 were dark but #7 was wet with OIL, I looked inside of cylinders all looked normal to me except #5 piston looked darker than the other and a little wet also piston on cylinder #7 had oil stting there oil was black i would say there was like about 1 TEASPOON of oil sitting inside #7 piston all the other pistons looked normal and dry. I checked plug wires and plugs to see if they were wet with oil on the outside and they were dry so the oil didnt come from valve cover. I dried the oil from pistons gapped spark plugs and put them back on I did put new #5 and #7 plugs cus the old ones were black I started engine (starts like normal) but after 1 minute iddleing it starts smoking I think its blue smoke so I stop engine and check plugs and again plug #7 was wet with oil . Checked compression (was same as when I started this thread, GOOD) Did cylinder leakage test and was Good (around 10% leakage on all cylinders). I have been all over internet I found out that the valve stem seal can cause this but im not 100% sure about this, does any one have any input on this or what can I do to find a posible repair?

thanx everyone

I had that problem once when I had a blown head gasket.  I had the valve stem problem on my first 289 when it passed 200,000 - replaced it right away.  You could have either - or both!?!

With that much oil in the cylinder, I would surmise that a blown head gasket would be the cause.  You can't get that much oil past one oil seal. 

BTW:  If it is the seal. it is most likely to be the intake valve as there is a vacuum in the intake system and pressure in the exhaust.