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Thread: Wiring checked. Engine in. B1 02 error - lean. eeHack log attached. Paying bounty!

  1. #16
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    Quote Originally Posted by kur4o View Post
    I think that you will need a new tune with that intake manifold. Individual air to cylinder passage are different by stock manifold. Edelbrock must flow much more air than stock and the individual cylinder trims are off the chart. Mode 4 control allows you to control realtime how the engine runs.
    Thanks for the info. Yeah, I am starting to think this Edelbrock LT1 manifold may be the source of my ill's. I swapped over the OEM throttle body and it had no affect, so the 58mm one is back on there for now

    Quote Originally Posted by Terminal_Crazy View Post
    Haha. Thatís why i asked about the manifold! Yes i had issue (may still have) with the Edelbrock LT4 manifold. I remachined both faces as it was sucking air from underneath the ports.
    Thanks Mitch - you may have hit the nail on the head. I got the OEM intake off the shelf and started cleaning it up for re-installation within the next few days. We will see what sort of effect that has on all of this.

  2. #17
    Fuel Injected! steveo's Avatar
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    never used the edelbrock manifold, but in all my years of dealing with LT1 engines i've only heard of headaches, never any benefits

  3. #18
    Fuel Injected! Terminal_Crazy's Avatar
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    Easiest way to check the manifold when you clean it up...
    check it's not sat on the front or back walls.(verylikely not as it will be sat up on the port faces.

    lay 4 strips of some plumbers solder (about 2-3mm in diameter) across the port openings then snug the manifold down with a few bolts.

    When you lift the manifold, measure the solder at the top & bottom of each port opening front to back.
    There will probably be more clearance on the bottom. You are supposed to have a small clearance up at the top so the bottom fits in and the top is pulled up to the port faces.

    You could try pumping propane into the valley through the rocker cover and watch the O2's/BLM's drop if it is sucking under there.

    Good Luck
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  4. #19
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    Update: Huge air leak in the valley - both sides. The intake gaskets were a tick too small for the openings and as a result, it was sucking air. I have ordered the correct gaskets - which are not the FelPro LT1 - and we will see.

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  6. #21
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    Quote Originally Posted by steveo View Post
    cough cough ...
    Check your resfilter email.

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  8. #23
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    Quote Originally Posted by steveo View Post
    have you considered just swapping back to an oem manifold?
    Yes - that's what I set out to do yesterday. Have the manifold and gaskets ready to go. Once i saw the problem, though, I figured I'd give this thing one last shot. If it doesn't work, it only cost me $20 in gaskets and my time (outside of the purchase price of the manifold...)

  9. #24
    Fuel Injected! Terminal_Crazy's Avatar
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    Make sure you check the taper on the faces and the heads first.
    Is it LT1 or LT4 manifold?
    Just for my own interest.

    Thanks
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  10. #25
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    Quote Originally Posted by Terminal_Crazy View Post
    Make sure you check the taper on the faces and the heads first.
    Is it LT1 or LT4 manifold?
    Just for my own interest.

    Thanks
    Mitch
    It's the LT1 specific model - the 7107. Interestingly enough, its powdercoated red, which according to Edelbrock is only available for the LT4 - but its stamped clear as day 7107. I don't have the taper gauge, but it appears to sit down just as it should on the heads. I'll run a feeler gauge around it and see what I come up with.

  11. #26
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    Update: Installed the Edelbrock with correct gaskets, which fixed the left 02 going super lean. Now they're both swinging as they should, but the car is still dumping fuel and sits at 160 blm at idle. MAF is still showing low-ish readings so I think it is still sucking air from somewhere. Pulling intake off and re-installing stocker, along with stock throttle body.

  12. #27
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    Update: Removed the Edelbrock intake, installed the stocker. MAF readings are back where they should be, vac readings are spot on. However, the BLM at idle is still around 150-153, with both sides showing lean/adding fuel. One side is +25, the other is +10-13. ICV counts are highish - hovering around 90, but throttle plates (Holley 58mm) are closed with the stop backed all the way off, and voltage set to .67v. The throttle body has *not* been drilled, and the Holley has the dedicated idle control circuit, just like the stocker.

    Once it comes off idle, the trims pretty much fall back into shape and are very close. It's only at idle that things go weird. I understand that split BLM's are a common ailment in cammed LT1s, and even moreso with aftermarket tb's - but does anyone have any ideas?

    I am going to remove the Holley and throw the stock unit back on and see what I see.

  13. #28
    Fuel Injected! steveo's Avatar
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    ICV counts are highish - hovering around 90, but throttle plates (Holley 58mm) are closed with the stop backed all the way off, and voltage set to .67v
    that's good, that's how it should be.

    if you don't have enough idle fuel and everything else runs ok, maybe just add some idle fuel. lets see a log of your warm idle

  14. #29
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    Quote Originally Posted by steveo View Post
    that's good, that's how it should be.

    if you don't have enough idle fuel and everything else runs ok, maybe just add some idle fuel. lets see a log of your warm idle
    Thanks Steveo. I put the stock TB back on and the car straightened right up. Still have a split at idle, but it's only at +2/+11. I suspect I can get that down by tweaking fueling?

  15. #30
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    yep. Im sorry you had to figure out what i was trying to tell you a while ago. I dont come on the forums much anymore and just saw this thread. In the bottom of the eextra.xdf there is a setting for end of injection timing vs coolant temp. Add .2 to the entire table and check the trims again. you can calculate the difference in the stock cam overlap or more importantly the exhaust closing point of the current cam and extrapolate the needed number. This step before individual fueling adjustments. If your running long tubes id suggest set the entire table to 1.0 for individual fueling and use a temp gun outlined on fbodytech

    Chris

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