Couple Problems..... Soft Code???

[Joel5.0]

Originally Posted by BowTie Eater 5 Liter

my problem is after 5000rpm the car doesnt like to work, it backfires and gets really stoopid... i just changed o2's, fuel filter, fuel pump relay(was getting a code for that). i get a "soft code" if i tromp on it through the first 3 gears(or more). the check light will come on and stay on until i let off, and i can not pull a code up for it. i was thinking the o2's were the problem, but now im leaning towards mass air sensor??? i havnt found a way yet to actually test to see if the meter itsself is screwed? does this sound like a condition of a bunk mass air meter?

another q, what should i have the fuel pressure set to running my combo(as ive just got the stock injectors for now) or should i leave it at 39psi?

thanks

That's the problem....anytime the CEL turns on, there should be a code registered in memory, not having a code means there's a problem with the EEC-IV...what kind of problem?.....anything from a bad EEC relay, wiring, VPWR supply, ground, fubar'ed PIP signal, bad TPS, bad alternator (bad rectifier causing electrical noise) or,.......fubar'ed ECM.

How did the voltage check on the MAF go? , did you get rid of code 56? LUK