Is fitechefi intake leaks
Start off with 5.3 .030 cast block , flat top prisons, AS A CAM 226/236. .525/525 110+4. 862 worked heads . Howard springs, pushrods. New plugs, 10.5 spark wire, coils, reworked rocker arms, ls7 lifters. Full exhaust
Started out p0355 code changed CRANK position sensor . Got it ideling basically. At 170 vacuum 12 to 15. Really bad idle surging no rev cuts out. Smells really rich , gassy raw fuel. Have the o2 set to 16.
Checked plugs this morning after blasting clean re-ran engine seemed better pulled plugs #3,5, 4and6 black #1,7,2 and 8 white. That's why it's running like sh-t. Pulled intake looks like seals n place but seems to have been leaking what the problem ?????
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Sorry this is the fitechefi 70002 with trans controller 500hp unit. No trans hooked up at this time fuel psi 58lbs.
Do you think it is a manifold issue or it may not have seated correctly during install?
Good thing is you found the problem.....
Not sure yet! Going to straight edge the manifold flanges . I did notice the seals where set. Do u think that would explains the discoloration on the plugs ?
Yep, getting air where it's not supposed to come from. Would lean out that side.
Plugs 2 and 8 where white. 4and 6 where black. 1 and 7 white 3 and 6 black. Odd patterns.
Update ! Found damage on underside of intake on the flanges . Made by the 3 inboard head bolts from both heads. That made it imposible for the intake to make as seal. Recessed contact points on intake and ground down head shoulder on bolts. Note: while installing intake hade to remove IAC sensor and noticed the sensor tip was melted from the engine backfire. Coursing the engine to run rich. Part of the initial complant.
I have the part number a link for the IAC. The LS is the same as the throttle body units. Check the Parts and Accessories topic.
What am I missing done everything by the book and still can't get this engine to run ! Now when I power up the system no fuel pump prime . By past wiring to pump got 58p psi at gauge. Engine trying to run . I'll move the throttle by hand and it will sputter for a few min 2 . Checked plugs at least four was wet. Full power to coils key on and cranking seems like no matter just won't run. Even done a compression test looking at 110 / 120 all cylinders .
Possible issue. The factory coil harnesses have some design flaws. You may not be firing all your coils or may be intermittent. I beleive there is a MSD harness available to fix. Just a thought, may not be the issue.