Thread: 91 Pontiac Grand Prix with 3.4 litre DOHC 24 valve

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  1. #1 91 Pontiac Grand Prix with 3.4 litre DOHC 24 valve 
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    Im hoping someone can help me with this beast. I just bought it and am having issues. Starts and idles but you excellerate to 3000 rpm and it wont go past that. Push it to hard and it stalls. No engine light on and no codes in the OBD. Any ideas?
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  2. #2 Re: 91 Pontiac Grand Prix with 3.4 litre DOHC 24 valve 
    Florida Tuner Z34Phoenix's Avatar
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    could be clogged cat converter. sounds like typical symptoms.

    96 Z34 (RIP LQ1 14.81@92.3) L36 Swap 14.9@91.5 www.cardomain.com/id/z34phoenix
    Topswap: P&P All,Si Valves,L76's,LW Pushrods,SD's,DHP PT PB 13.91@99.8
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  3. #3 Re: 91 Pontiac Grand Prix with 3.4 litre DOHC 24 valve 
    I live here. Slick2500's Avatar
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    Does it idle normal or do the rpms fluctuate?
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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  4. #4 Re: 91 Pontiac Grand Prix with 3.4 litre DOHC 24 valve 
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    Idle normal and Cat is new.
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  5. #5 Re: 91 Pontiac Grand Prix with 3.4 litre DOHC 24 valve 
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    Restricted fuel filter or weak in tank fuel pump. I own one with a 5 speed stick.
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