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  1. #31
    Member timfitz63's Avatar
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    Quote Originally Posted by c4c5specialist View Post
    ... And if you EVER try to put ethanol in pre 1997 Corvette, it can actually short out fuel injectors due to the corrosive nature of the fuel flowing past injector electrical windings. This is for Crossfire, L98, and Multec 1 design injectors...
    Paul:

    Since you list the 5.7L L98 TPI engine here, could this same problem affect the 5.0L LB9 TPI engine used in the GM F-Bodies? I'm having issues with my '89 Firebird Formula, and long story short, I'm starting to suspect a fuel delivery problem (fuel pump and/or injectors).

    1998 Aztec Gold #15||| 2004 Millennium Yellow

  2. #32
    Technical Writer for Internet & Print Media
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    Quote Originally Posted by Vettehead Mikey View Post
    On the other hand, I've been dealing with Ontario's 'drive clean' program and it's wacko testing methods. This is to get the daily beaters certified, not the Corvette. The approval system used till just recently measured actual tailpipe emissions. The new system in place now couldn't care less about that, and the technician simply plugs into the OBD2 port and looks for current fault codes, evidence that codes had been deleted or confirmation that all is well. The problem is that if any repair has been done to ready the car for the test and demonstrate that it's in top shape, this obviously can been seen in the computer, and gives you an automatic fail.

    Nice.
    Down here in the States, that's the system California is going to for many newer cars. No five-gas readings just connection to the MIL but the "smog machine" is not only looking at any DTCs and readiness flags, it's also looking at global OBD2 serial data.

    In my case, I had the classic loose gas cap scenario (P0456) which was easily fixed but gave me a fail as the technician reset all the codes. I had to do a 40KM drive around the countryside TWICE to get the car to complete the self tests and give the required P1111 'all is well signal'. What waste..................
    Common problem down here.

    When I need to set the flags prior to a test, I use the drive-cycle in the Service Manual. I can get it done reasonably quick, if I can start cold.

  3. #33
    Technical Advisor c4c5specialist's Avatar
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    Quote Originally Posted by timfitz63 View Post
    paul:

    Since you list the 5.7l l98 tpi engine here, could this same problem affect the 5.0l lb9 tpi engine used in the gm f-bodies? I'm having issues with my '89 firebird formula, and long story short, i'm starting to suspect a fuel delivery problem (fuel pump and/or injectors).
    absolutely!!!!!!
    GM World Class Certified Technician.
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  4. #34
    Member timfitz63's Avatar
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    Quote Originally Posted by c4c5specialist View Post
    absolutely!!!!!!
    Outstanding... Well, at least I have something concrete to chase now; up to this point, it's all been guess-work and speculation as to where the problem may lie... And so far, the guessers have been wrong...

    1998 Aztec Gold #15||| 2004 Millennium Yellow

  5. #35
    Technical Advisor c4c5specialist's Avatar
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    Quote Originally Posted by timfitz63 View Post
    Outstanding... Well, at least I have something concrete to chase now; up to this point, it's all been guess-work and speculation as to where the problem may lie... And so far, the guessers have been wrong...

    HI there,

    Start with checking your resistance on your fuel injectors. 16.5 ohms before running vehicle when cold.

    Allthebest, Paul
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  6. #36
    Member timfitz63's Avatar
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    Quote Originally Posted by c4c5specialist View Post
    HI there,

    Start with checking your resistance on your fuel injectors. 16.5 ohms before running vehicle when cold.

    Allthebest, Paul
    Thanks, Paul! Will do! I seem to remember stumbling across a diagnostic procedure on a forum somewhere, but if you've got a good summary on how to do that, it'll save me a bit of searching.

    1998 Aztec Gold #15||| 2004 Millennium Yellow

  7. #37
    Member timfitz63's Avatar
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    Quote Originally Posted by c4c5specialist View Post
    ... And if you EVER try to put ethanol in pre 1997 Corvette, it can actually short out fuel injectors due to the corrosive nature of the fuel flowing past injector electrical windings. This is for Crossfire, L98, and Multec 1 design injectors...
    Well, Paul, I think you pointed me in the right direction with my Firebird... I was back in San Antonio during the past week, and managed to find a half hour or so to check the resistance on the fuel injectors. And I've uncovered at least one problem with the car: I've got one injector that's bad, one borderline, and two more that are probably just starting to fail... About half the engine isn't running right due to a fuel supply problem...

    The failed injector measured 7.9 ohms -- about half of the 16 ohm specification; one was 14.7 ohms (barely in +/- 10% spec. tolerance, but more than 0.5 ohms difference from the 'good' injectors that read ~16.2 ohms); and two more were in the low 15 ohm range (again, more than 0.5 ohms difference from the 'good' injectors). These are the original, 1989-vintage injectors, by the way...

    So, I'm looking at replacing all of the injectors; I figure the four 'good' ones can't be very long for this world... Is this task (fuel injector replacement) a relatively simple DIY or best left to the professionals? And any suggestions on what injectors with which to replace these originals?

    1998 Aztec Gold #15||| 2004 Millennium Yellow

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