Say goodbye to K Jet injection ... again | FerrariChat
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Say goodbye to K Jet injection ... again

Discussion in '308/328' started by [email protected], Jul 18, 2010.

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  1. andy2175m4@yahoo.com

    [email protected] Formula Junior

    Dec 7, 2008
    473
    Los Angeles, CA
    Full Name:
    Andy Rein
    #1 [email protected], Jul 18, 2010
    The EFI saga continues, when I got this car 2 years ago, the K-Jet was rusted out, spent a lot of $$ and a lot of time trying to fix the K-jet myself, to no avail (learned a lot but could not stomach paying $2000 for someone else to rebuild the whole thing) I installed a Holley EFI/MPI system, worked for a little while, but the ECU was flakey, kept quitting.

    I bought a Megasquirt I from a local guy, and after some learning curve and growing pains, now it actually runs and start everytime, works quite well actually. Runs clean, starts right up, tunes quickly. All those years of fooling around with Mr. Bosch and the Holley paid off, now I can actually tune the thing.

    BUT................since I am trying to make this gutted Florida car Calif smog legal, I have new cats on the thing, and now that it's running long enough to get up to operating temperature for the first time, but one of the two cats is getting RED HOT. I did not have 02 sensor working at first, but with some fiddling, now it seems to be working, and tune seems to be close ot 14.7 at idle, as the 02 sensor voltage is bouncing back and forth past 0.5 VDC, as it should

    Also, the air pump is not quite up to speed yet, it's not putting out a huge amount of air, will the cats light up red hot if the fresh air supply to the cats is a bit weak ?? I probably know the answer is yet, but I am hoping .... I don't want to rework that pump again, but maybe I will have to.
     
  2. Birdman

    Birdman F1 Veteran

    Jun 20, 2003
    6,689
    North shore, MA
    Full Name:
    THE Birdman
    #2 Birdman, Jul 18, 2010
    You can remove the air pump entirely and that should not harm the cats in any way (i.e. it should not make them run hotter...in fact it will likely make them run cooler because the air pump puts fresh air in the exhaust to help burn off more hydrocarbons. Without a source of O2 for the burning, there is less burning. Neither of my cars have the air pumps anymore.

    A red hot cat is usually caused by a cylinder that is not firing, and the excess fuel is being pumped into the hot cat where it is burning off, thus making the cat glow. BTW, this is very very bad for your cat and a fire hazard for your car.

    A exhaust can also get really hot (like red hot headers) if the car is running very lean, or if the timing is off (retarded). But those issues usually affect the headers more than the cat. When a cat is glowing, it's almost always going to be raw fuel getting into it.

    Birdman
     

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