Thread: 3400 sfi H.O.

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  1. #1 3400 sfi H.O. 
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    need some help with a 99 pontiac grand am gt H.O. 3400 sfi. Its starting rough due to low fuel presure. it has a new fuel pump and the fuel lines have all been ran through. and for some reason all of the lights on the dash are on. Feel free to leave any advise thanks
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  2. #2 Re: 3400 sfi H.O. 
    The Blue One blueguy's Avatar
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    Junk pump replacement?

    You said the lines have been ran through, assuming you have a new fuel filter as well?

    Maybe there is a clog in the rail or...start checking fuses/relays/wiring to make sure its getting a solid connection.

    Also, this section is for the 3.4 DOHC...I'll move it for you
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  3. #3 Re: 3400 sfi H.O. 
    I live here. TLSheff's Avatar
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    Did you replace the fuel pump?

    Is it running rough all the time, or just idling?

    Does it cut out when driving?

    What all codes are showing up?
    (Go to a close auto place, they have scanners you can use for free to check codes, write each down Pxxxx - description, come back and well go from there)

    Quote Originally Posted by AmericanSoldier View Post
    ...not scanning/monitoring your motor is like bangin a hooker and you just HOPE your not infected.
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  4. #4 Re: 3400 sfi H.O. 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Bad Fuel pressure regulator can cause low FP at start up too.

    SMGPFC Member #1
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  5. #5 Re: 3400 sfi H.O. 
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    Yeah check fuel pressure reg.
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  6. #6 Re: 3400 sfi H.O. 
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    its just when your starting it and yes filter and pump are new and thanks ill look into it now
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  7. #7 Re: 3400 sfi H.O. 
    Moderator dsmuts's Avatar
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    I had a problem getting a 3100 running at start up and it was a lazy fuel pump. It's possible you got a bad one.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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