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  1. #1
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    Corvette(s)
    1989 black

    Default fuel injector problems

    I just tried testing the resistance readings on all injectors on my 89 c4 and found that three of them read 6.1 ohms, two read 10.7, one reads 11.7 ohms and two read 16.9 ohms. Is this possibly the reason that it won't start when it is hot??? If the answer is yes, is there a good publication out there that would guide me through the replacement process??

  2. #2
    Member LT4man's Avatar
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    96 Collectors Edition LT4

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    Call Jon at Fuel Injector Connection in Georgia.

    Google his company and give him a call. Jon will call you right back.

    Also search his company (FIC) here to find threads regarding the Bosch Design III fuel injector for your Vette. You will be glad you did!

    SAVE the WAVE!
    An attendee at all the CruiseFests including the one which never happened.


    Autosig (Shadow) A

  3. #3
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    Corvette(s)
    1990

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    Quote Originally Posted by LT4man View Post
    Call Jon at Fuel Injector Connection in Georgia.
    You will be glad you did!
    The Man
    Rave reviews for product and exceptional customer service across many Forums
    http://forums.corvetteforum.com/c4-t...on-91-l98.html

    Best $170 you will spend
    CorvetteInjectors.com - 1986-1992 Corvette, Camaro Pontiac T/A Bosch Desig

  4. #4
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    Quote Originally Posted by Bentas1ent View Post
    I just tried testing the resistance readings on all injectors If the answer is yes,
    Almost certain to be you problem
    If not those readings show your old injectors are on the way out , not going to get any better and long overdue for replacement
    see
    http://forums.corvetteforum.com/1560021781-post5.html

    Quote Originally Posted by Bentas1ent View Post
    is there a good publication out there that would guide me through the replacement process??
    The factory service manual is best but plenty online
    http://www.thirdgen.org/injectorswap
    http://www.corvettefever.com/howto/c...uel/index.html

    Cheat way ( need to download file and print )
    http://webpages.charter.net/buddiel/...al)%201-04.doc

  5. #5
    Member Schrade's Avatar
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    '90 LT 5

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    Some more pics here on injector removal and dis-assembly...

    I have a set of new O-rings, if your injectors pass the spray test. They're yours if needed.
    Never got a nickel for wrenchin', so I know nuthin'...

    Get rid of your electrons. Be positive (+).



  6. #6
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    Quote Originally Posted by Schrade View Post
    Some more pics here on injector removal and dis-assembly...
    LT1 injector replacement is a lot easier than TPI

  7. #7
    Moderator vetteboy86's Avatar
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    1986 Black "Indy 500 Pace car replica"

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    I did mine in an evening. I would recommend if you aren't very familiar with the engine compartment to take lots of pictures during the removal. The plenum and runners can be a pain, but as mentioned well worth it. Use bags contain hardware as removed, and label with detail.

  8. #8
    Member Schrade's Avatar
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    '90 LT 5

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    Quote Originally Posted by vetteoz View Post
    LT1 injector replacement is a lot easier than TPI
    Sure was. Especially those 2 base endbolts on the runners on my '87.

    3/8" drive -> 3/8" x 1/4" adapter -> 1/4" x 8" adapter extension ->1/4" x 3/8" adapter -> 3/8" Torx (plus some skin off the knuckles ).
    Never got a nickel for wrenchin', so I know nuthin'...

    Get rid of your electrons. Be positive (+).



  9. #9
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    87 z-51

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    Quote Originally Posted by Schrade View Post
    Sure was. Especially those 2 base endbolts on the runners on my '87.

    3/8" drive -> 3/8" x 1/4" adapter -> 1/4" x 8" adapter extension ->1/4" x 3/8" adapter -> 3/8" Torx (plus some skin off the knuckles ).
    I did my injector swap in about 4 hrs...the back ache lasted much longer.

    There is lots of good info on youtube for someone thinking of doing this. Here is a link to one video that gives an idea of what to expect...

    YouTube - GM Corvette TPI L98 Step by Step Injector Swap Video Guide (10 min. video)

  10. #10
    Member Schrade's Avatar
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    Quote Originally Posted by boomdriver View Post
    I did my injector swap in about 4 hrs...the back ache lasted much longer.

    There is lots of good info on youtube for someone thinking of doing this. Here is a link to one video that gives an idea of what to expect...

    YouTube - GM Corvette TPI L98 Step by Step Injector Swap Video Guide (10 min. video)
    I can't put a bolt back in a hole until it's been through a tumbler (ammo brass), or cleaned with a brush (literally), and the hole is chased and lubed, sometimes block holes Shop-vac'ed clean (and usually taken pics).

    I spent 9 FULL days doing that thread above, and about 3 weeks on my L98.
    Never got a nickel for wrenchin', so I know nuthin'...

    Get rid of your electrons. Be positive (+).



  11. #11
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    87 z-51

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    Quote Originally Posted by Schrade View Post
    I can't put a bolt back in a hole until it's been through a tumbler (ammo brass), or cleaned with a brush (literally), and the hole is chased and lubed, sometimes block holes Shop-vac'ed clean (and usually taken pics).

    I spent 9 FULL days doing that thread above, and about 3 weeks on my L98.

    I did all the work prior....new bolts bought, taps in tool tray, top of engine always sterile. The slowest part was the assembly of the rails, O rings and then check and recheck the pressurized system before going further. The rest? just turning wrenches and staying focused.

    Planning ahead for everything was the only reason it did'nt take me a week. I approached the job with every possible combo of extentions and swivel joints and long reach torx that has ever been made knowing the bolt behind the EGR was a PIA and I did'nt want to stop and have to hunt for tools, so I got everything I might need before starting.
    The first time I did L98 injectors it took a week or two....that was an education. This last time I knew exactly what I was gettin into. Day before I called a couple local shops to see what they'd charge.....as I did'nt really want to do the job myself.

  12. #12
    Member Marv02's Avatar
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    1986 C-4 Corvette

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    Quote Originally Posted by boomdriver View Post
    I did my injector swap in about 4 hrs...the back ache lasted much longer.
    One thing I have learned from working on these cars If you have back Issues like lot of us lets say Older guys with back Issues is Put the car on jack stands so you dont have to bend over as far for hours at a time.

    I feel you'r Back Pain LOL Back Pain sucks.
    383 4 bolt main (10.5 to 1) Balanced, Flat top , pistons LT-4 Hotcam, C C ultra pro magnum steel 1.6 RRA, Trick Flow Heads Super 23 (195 runners) 62cc , SPL runners, Hi Flow intake base, 24# FIC Bosch 3 Injectors, Chipped, Melrose full headers, 3 way Main cat, Borla 11134.
    700r4 Trans built, 2500 Stall Lock up Convertor, 307 rearend.373
    403 H/P @ 5000
    498 TQ @ 2500

  13. #13
    Member LT4man's Avatar
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    FIC LT4 fuel injectors work..........AWESOME! (Caution: long read!)

    Long read, but well worth the effort!

    Only my opinion.

    I spent a little more for NEW injectors from Jon. Only the BEST for my LT4!

    SAVE the WAVE!
    An attendee at all the CruiseFests including the one which never happened.


    Autosig (Shadow) A

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