Well at 183k on my 351w I decided to pull it tear down inspect if it needed machine work do it. Had the truck almost 80k now always ran good, but I didn't see this coming. had oval on intake gaskets, bearings were dated 9/95 ford. timing set still in good shape, checking bores right at top just at highest point of reach 12-14tho. on all of the cylinders. bearings still looked good, side clearance everything was in spec.
Now why I tore it down, had a set of gt40P heads that came off a 40k 99 explorer did port work on bowls and matched with port matched 351w lower to 5.0 truck upper left stock cam with scorpion racing roller 1.72 rockers. JBA short tube headers magnaflow y pipe welded o2 bungs in(OBD-II) new rings bearings oil pump trick flow spring kit stem seals.
Went together well, did reading here and other places told run 24lb injectors got matching pro-m 24lb 75mm mass air....What a disappointment feels like it pulled harder with e7te big cats well stock. and getting bank 1&2 lean code)

Curtis

 

The stock cam is tiny, you should have seriously considered replacing it with a few of the suggested ones from Conanski.

 

Yeah it is but .477 and .483 lift isn't horribly small now compared to with 1.6 rockers. Thing that gets me is scanner says bank 1 and 2 are lean with 24lb injectors theres no way it should be lean if anything the 24s should have been over kill. In park sounds great idles smooth as silk revs up really well in gear another story, will detonate with less timing than stock. 02, heater, egr all emission systems info on scanner won't complete. .

Curtis

 

I'll bet you're misinterpreting the codes you're getting, they're probably saying the computer is at lean adaptive limit which means it's stupid rich and the computer can't lean it out any more. Post up the exact code numbers you're getting.

P.S. Stock cam is 0-4000rpm in this motor doesn't matter what topend is on it, and given that you don't need 24lb injectors and a larger MAF meter so I bet it would run better with the stock parts on it.

 

Codes: P0171-System too lean(Bank1), P0174-System too lean(bank2)
Running down the road watching short and long the short term will get 5,2 area but WOT 20ish area.
o2s are 6 months old Motorcraft, idle they smooth out short term, idles beautifully. I know my flanges are leaking can hear a little leak on both but shouldn't throw it around for o2s.


Thanks for the help, I appreciate it
Curtis

 

Are you sure the injectors you put in were actually 24 lb-hr injectors? I don't really like those "calibrated" MAFs, they work by tricking the computer into thinking less air is going into the engine than there actually is. I'd try switching back to your stock injectors and MAF and see how it goes.

As mentioned, the stock cams are these trucks are worthless.

 

The injectors are light blue F55E-A2D came out of a 96 lincoln 4.6 DOHC car ran great just under 100k was rearended.
MAF is a PRO-M not a screwball cheap junk one.

 

Doesn't matter what brand the MAF is, they still work by effectively tricking the computer.

 

That's just proof the engine doesn't need 24s.

That's not good, any leak upstream of the O2 sensors will affect closed loop fuel trims.

 

Ok, I will throw the 19lb and oe MAF back on it and let you guys know.

 

Well 19s in oe MAF in, runs good not as well as it did with 24s. But I did notice the oe MAF reads like 3.5+ running down the road, the PRO-M was at like 6 no matter what idle or WOT, so there is my lean condition. But why? any ideas?

Thank you, appreciate it
Curtis

 

3.5 what? lb/s? volts?

 

That big 75mm is useless on a low rpm truck motor. All the work on intake/heads is not going to help the stock cam(restriction).

 

LBs yes, so the PRO-M not doing me any good as far as reading but truck few times did pull so much harder.
I just got off the phone with my cam guy he suggested a 5.0HOish grind with slightly less duration on the intake, being it is a truck with a E4OD 4250rpm is when it shifts anything more than that is wasted its like guys wasting their time with huge duration to get it to lope, sounds nice but when it does not make power until 2000+ -6500rpm that is mustang land.
Helped build a 460 for a friend that way, monster duration big lift with stock heads add a single plane intake and manifolds. Wondering why it does not perform like he wants call to my cam guy swap it and a dual plane manifold hey what do ya know now it runs.

Thank you
Curtis

 

Yes the E4OD WOT shift points in drive are fixed, but you can manually lock it into 1st, 2nd or D (OD locked out) and the engine will happily plow right into the rev limiter.

Is there any way you can get your scan tool to read MAF Volts? That will be a better indicator of how much "reserve" your MAF has left.