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Guys i need help asap please !!!!

This is a discussion on Guys i need help asap please !!!! within the General Help forums, part of the LSx Technical Help Section category; Ok so heres the problem i have a 98 firebird formula A4 with----- 40,000 miles Headers slp intake, ORY Magnaflow ...

  1. #1
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    Guys i need help asap please !!!!

    Ok so heres the problem i have a 98 firebird formula A4
    with-----
    40,000 miles
    Headers
    slp intake,
    ORY
    Magnaflow
    Frost Tune

    and i realized the other day that it was running kinda choppy then my light came on code P307 and the car smelled EXTREMLY rich! it was misfireing in cylinder 7 so i changed the coil pack the wire, the plug still ran like shit especially when i was sitting at a light it felt as if it was stutering
    so im pretty sure its the fuel injector its staying open and just dumping into the cylinder!

    what fuel injectors should i get? i only want to replace the one with a stock 28 lb injector, and autozone has a single Bosch for 129.99 or what size injector can i upgrade to without changing the fuel pump? what do you guys think?

    also any write ups on how to take off the fuel rails and replace fuel injectors?

    any help would be appreciated

    thanks guys
    i can always count on ls1.com!!!!!!

  2. #2
    408 ci + 4000 stall = fun lancesT/A's Avatar
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    you can upgrade quite a bit without changing your fuel pump anything around 60lbs or higher is where u start to look at changing the pump if your planning on running more mods (cam, heads, etc) you might as well spend 330 on a set of racetronix 42lbs or whichever brand you choose all around the same price. better than spending 130 on just one (stock replacement) injector


    my .02
    Last edited by lancesT/A; 05-29-2010 at 04:27 PM.
    501rwhp, 538 rwtq thru an A4 and a 4000 stall (n/a) not to shabby i say

  3. #3
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    Well I don't think I'll be putting in a cam or heads the only other work that will be possible going into the car is ls6 intake manifold, gears and rear end work what's the best size injectors to put in with my current mods and would I need to send it back out for another tune? If so where can I get a good set of stock injectors for a good price?

  4. #4
    408 ci + 4000 stall = fun lancesT/A's Avatar
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    price wise for a full set of 37lbs injectors from texas speed for 280 which i dont think u will require a tune it might be beneficial to get one however

  5. #5
    408 ci + 4000 stall = fun lancesT/A's Avatar
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    for stock ones they have them for 40 each on rockauto.com but that is for a reman injector but it beats 130 for a bosch

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    Member DaddySS's Avatar
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    When you pulled the plug was black & sooty or black and shiney?

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    Quote Originally Posted by DaddySS View Post
    When you pulled the plug was black & sooty or black and shiney?

    To be honest I'm not sure I didn't pull them and replace them my buddy did while I bought some parts I'll Check first thing tommorow, but why what does it mean for either condition?

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    Senior Member tatertot91's Avatar
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    did you try cleaning your MAF, its worth a shot
    CRC maf cleaner works good

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    Quote Originally Posted by lancesT/A View Post
    price wise for a full set of 37lbs injectors from texas speed for 280 which i dont think u will require a tune it might be beneficial to get one however
    Larger injectors require tuning or you'll wash the cylinders. I can't believe some of the bad info I read on here and LS1Tech.

  10. #10
    408 ci + 4000 stall = fun lancesT/A's Avatar
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    Quote Originally Posted by 02blkws6 View Post
    Larger injectors require tuning or you'll wash the cylinders. I can't believe some of the bad info I read on here and LS1Tech.


    i dont think a 28 to 37 jump will wash the cylinder but i guess il leave it be dnt wanna start an arguement especially over the internet
    Last edited by lancesT/A; 05-30-2010 at 01:37 AM.

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    Quote Originally Posted by lancesT/A View Post
    i dont think a 28 to 37 jump will wash the cylinder but i guess il leave it be dnt wanna start an arguement especially over the internet
    Going from a 28 to a 37 without a tune WILL wash the cylinders. If you don't believe me, try it on your car. What is there to argue about? You don't even know how to tune cars. You have a built 408 in your car? What's it run at the track?

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    Ok so ordered a remanufactured fuel injector from rockauto do i need new rings and seals for the injectors since i will be taking out the fuel rail on the right side do i need rings and seals for the fuel injectors that are coming out? im just changing one out but wondering if i will need them all for the fuel rail?

  13. #13
    408 ci + 4000 stall = fun lancesT/A's Avatar
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    Quote Originally Posted by 02blkws6 View Post
    Going from a 28 to a 37 without a tune WILL wash the cylinders. If you don't believe me, try it on your car. What is there to argue about? You don't even know how to tune cars. You have a built 408 in your car? What's it run at the track?
    no track times yet need to upgrade the rear end first just finished the 408 project 2 weeks ago and ur right i dont know how to do the tuning part

  14. #14
    408 ci + 4000 stall = fun lancesT/A's Avatar
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    Quote Originally Posted by rcorte3001 View Post
    Ok so ordered a remanufactured fuel injector from rockauto do i need new rings and seals for the injectors since i will be taking out the fuel rail on the right side do i need rings and seals for the fuel injectors that are coming out? im just changing one out but wondering if i will need them all for the fuel rail?
    i would replace them but thats bc i dont like to reuse anything but when u get them out u can always visually inspect them to look for any extensive wear or damage and go from there

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    Moderator Cutlass's Avatar
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    rcorte3001 if you just have a bad injector and wanna replace it, then just look for a used stock replacement. try junkyard or check the For Sale section for someone selling theirs because they upgraded

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    No need to replace all the injector o-rings. Smear a little clean motor oil on the o-rings to make assembly easy.

    lance, I'm still on a 10 bolt.


  17. #17
    408 ci + 4000 stall = fun lancesT/A's Avatar
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    Quote Originally Posted by 02blkws6 View Post
    No need to replace all the injector o-rings. Smear a little clean motor oil on the o-rings to make assembly easy.

    lance, I'm still on a 10 bolt.

    Click for full size


    nice

    i dont have problem with the 10 bolt i ordered my moser axles friday.... im actually really nervous about going to the track dont wanna break anything the 408 build was expensive and i dont wanna break anything but there is an 1/8 mile track in my town so im sure il be up there nxt weekend

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    Quote Originally Posted by Cutlass View Post
    rcorte3001 if you just have a bad injector and wanna replace it, then just look for a used stock replacement. try junkyard or check the For Sale section for someone selling theirs because they upgraded
    your best advise. Better listen.

  19. #19
    The injector may not fix the misfire.

    A compression test should be performed first.

  20. #20
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    Quote Originally Posted by Marc 85Z28 View Post
    The injector may not fix the misfire.

    A compression test should be performed first.


    What else would it be we have done spark plug wires coil packs and the only other thing is fuel injector

    Keeping in mind it only has 40,000 miles and it smells extremly rich

    I haven't done a compression test yet what should it be at 4ohms

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