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Thread: 1998 k1500 5.0 305

  1. #1
    Senior Member JustinD's Avatar
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    Default 1998 k1500 5.0 305

    My buddy has a 98 K1500 with a 5.0 Vortec engine, he has a P0420 code coming up CAT code, can I just go in and make it no MIL not reported until he gets a new CAT? He just doesn't want to look at the light all the time.
    2001 Chevrolet K2500HD Duramax
    Suncoast SCIV 1056
    Kennedy twin lift pumps
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    MBRP 4" exhaust
    Air intake horn mod
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    Tuned with EFI
    12.65 @ 107 1.71 60'

  2. #2
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    You need the V2 unit to do what you suggested on a 98.
    98 GMC RCSB 2WD, Internally stock 305 w/Twin T-3 junkyard Turbos,4L80e,Ramjet intake,42lb.inj., 0411PCM, COS3,4675LBS w/me in it. Best Time on 5 passes-13.01@110

  3. #3
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    Lextech, Justin has a V2 for his Dmax and for at least his buddy's P12 so he's good there!

    Justin, I think you should still leave the code reported, just shut the MIL light off. Or you can kill both. Its gonna cost a license, might be about the same price for your buddy to buy a cat.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
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  4. #4
    Senior Member JustinD's Avatar
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    Yep, thanks Erik, thats what i told him, I suggested he buy a new high flow cat instead, is there much that can be done with his truck? It is a 5 speed manual so I can't imagine it has anything holding it back (TQ managment)??

    BTW Erik, I think we figured out the P12 issue, he had a compustar alarm in it, they used the OBDII port to steal the juice from. We are going to try again.
    2001 Chevrolet K2500HD Duramax
    Suncoast SCIV 1056
    Kennedy twin lift pumps
    Billet pick up
    MBRP 4" exhaust
    Air intake horn mod
    ARP head studs
    A few more go fast/truck pulling goodies!
    Tuned with EFI
    12.65 @ 107 1.71 60'

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