Thread: L67 grampy car cat issue, or maybe coils?

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  1. #1 L67 grampy car cat issue, or maybe coils? 
    3repete
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    Default 03-12-2017
    I've been bringing this L67 Buick Ultra along. Looking for some input. I have already found a misfire & replaced the wires and plugs with NGK stuff. The plugs are iridium.
    I get a ratcheting noise under power at higher rpm. Originally was at 4000 revs so I swapped in the coils from my other car and the ratcheting went up to 4500 rpm.
    I'm thinking sure coils, but is that how these cars act when there's a clogged cat? No engine codes are being displayed, though I do have a trans problem code (PO741) that I am separately working on.
    Which coils do the best? And would a voltage upgrade sometimes help? This car is loaded with power accessories.
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  2. #2 Re: L67 grampy car cat issue, or maybe coils? 
    cheatah faheatah
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    Default 03-12-2017
    Ratcheting ?? Like pre-ignition (ping) ?
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  3. #3 Re: L67 grampy car cat issue, or maybe coils? 
    Scottydoggs
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    Default 03-12-2017
    check for zip ties on the axles lol

    for real tho vids help for sounds.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  4. #4 Re: L67 grampy car cat issue, or maybe coils? 
    cheatah faheatah
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    Default 03-12-2017
    Or playing cards in you spokes ? ... lol
    For the record : I am NOT a naked meth-head who shoves rocks up my butt.
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  5. #5 Re: L67 grampy car cat issue, or maybe coils? 
    3repete
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    Default 03-12-2017
    Yeah, like a fast clicking under load. And nope no zip ties. I'll smack the cat to check for rattles, put in new coils and report back.
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  6. #6 Re: L67 grampy car cat issue, or maybe coils? 
    Slick2500
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    Default 03-12-2017
    Quote Originally Posted by 3repete View Post
    Yeah, like a fast clicking under load. And nope no zip ties. I'll smack the cat to check for rattles, put in new coils and report back.
    Usually when the cat goes, there will be a lack of power under load, and the cel flashes.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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  7. #7 Re: L67 grampy car cat issue, or maybe coils? 
    lola
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    Default 03-14-2017
    Grampy.
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  8. #8 Re: L67 grampy car cat issue, or maybe coils? 
    cheatah faheatah
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    Default 03-14-2017
    Post a vid w/good sound...
    For the record : I am NOT a naked meth-head who shoves rocks up my butt.
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  9. #9 Re: L67 grampy car cat issue, or maybe coils? 
    rynoman03
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    Default 03-14-2017
    I've been bringing this L67 Buick Ultra along.

    What does that even mean???
    1999 GTPHP Tuned, Ported SC/TB, 42#'s, SSAC's, ZZP Modded 1.9's/LS6 Springs/Manley's, TransGo Shift Kit, Poly Uppers, KYB GR2's/Springtech's. - 231k and traded it in. - Gone
    2000 GTP: XP, P&P'd Heads, N*\Lq4 MAF, GenV, 42#'s, PRJ Rails\FPR, Racetronix, TEP w/ 3.29 Gears, 300m, 7/8" chain, SSAC's. - Collecting dust in my garage.
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  10. #10 Re: L67 grampy car cat issue, or maybe coils? 
    lola
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    Default 03-16-2017
    I'm willing to bet the noise (since you have a transmission code) is trans related.
    2012 Buick Regal Premium1 Turbo - White Diamond Tri-coat - 20% Tint - 5k HID Head/Fog Lights - ZZP CAI
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