well, if the tune you're running is programmed for the 42# injectors (or whatever they are), don't put the smaller ones in there.
you sure there ain't any vacuum leaks? i just installed my headers last night & the first start surged to about there & promptly died. thats when i remembered i forgot to plug the hole from the EGR delete
00 FRC - just top end, exhaust, and a hot-air intake
99 Sierra - 5.3 / 5spd
↓ click the pic for the build ↓
Okay. So I made a few changes. I now have a 5.3 block, with the 4.8 intake manifold, cable operated throttle body, original 5.3's injectors, and a properly tuned ECM. The idle is now at about 2,000 RPM! I've checked for vacuum leaks, with a gauge this time, and it's showing normal at about 20. I cannot think of any other issues. Any ideas? Can anyone tell me how to make the IAC motor relearn?
you ever figure out the problem?
mine was doing something similar. I replaced the iac, went thru the idle learn procedure. Replaced the maf sensor. still had the prob. I had a ver slight vacuum leak at the intake gaskets. Replaced the intake gaskets and it idles smooth as new.
01 GMC Sierra 1500 4.8 auto. CAI is all the help she has. 300k miles and counting
Posting Permissions
Reply With Quote