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02 4.7 Ram 1500 LEAN FUEL TRIM after complete rebuild of engine
I watch all of Scanner Danners videos and own his book! I have personally rebuilt a 4.7 engine! Yes what a piece of crap! It dropped at valve seat at a gas station when she went to start it boom! It blew off the back of the intake and tried to blow itself up with high vacuum full throttle and she shut it off in time. Two pistons was damaged one very badly beat up with the seat in 10 pieces and one other piece went across to the other side of the engine through the intake and got another piston. What a year rebuild here and there. So the gas sit in truck a year and 4 months with stable and fuel Stabilizer I added over the months. It was for my wife and its her dream truck or I would have not rebuilt this one ever! Ive got almost 1000 miles on the new rebuild now, changed the oil 500 miles. I have a snap on verus and checked all the spark waveforms. I'm fixing to scope each injector. The injectors are flow matched and look rebuilt bright green color off of ebay. The coils are coils are brand new. I started getting 10.8 miles per gallon and now up to 11.2 and that Is all I can get on the highway, town is 10.5ish. I have noticed that anytime I'm on the throttle it is adding fuel in the long time fuel trim. Around 2000 rpm on the hwy it sits 14 to 18 positive. It does not have a MAF sensor. It does not have a EGR. Vacuum is 19.8 to 20. I cannot figure this out. I have put a fuel pressure gauge on the rail and its 60psi and doesn't drop when revved up. I would think it would be a dirty MAF but there its not one anywhere but may have a temp air sensor, and map. Map is almost 10psi at 2000rpm. Please help, Thanks Vance!
I changed to NTK oxygen sensors and it fixed it. Bosch was in there and I noticed when I tried taking it out it took over 10 minutes fighting to find out the welder that welded my catalytic converter in last year had done a messy job and almost welded the sensor in from the inside threads leaving splatter where it wouldn't unscrew. I had splatter all over the bottom of the sensor giving false readings.
