fuel injector removal
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Northstar Engines and System Technical Discussion Discussion, fuel injector removal in Cadillac Engine Technical Discussion; I 've got a '97 SLS with codes 171 and 174 current. I've tried probing with a propane torch (unlit) ...
  1. #1
    Harry Yarnell is online now Cadillac Owners Fanatic
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    fuel injector removal

    I
    've got a '97 SLS with codes 171 and 174 current. I've tried probing with a propane torch (unlit) to try to detect a leak to no avail.
    Next I want to remove the intake system.
    I've got a spare intake system from a parts motor ('96) that I want to disassemble to familiarize myself with how it's put together and look for potential leak points to minimize the down time with the car, I can't figure out how to remove the injectors as a unit (all 8 injectors and fuel rail). I've done this with 3.8 GM motors, but these N*'s are different.
    Before I break something, I thought I'd ask you guys...

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: fuel injector removal

    It's basically the same. Remove the hold downs, disconnect from the supply line, unplug the 8 electrical connectors and lift it out.

  4. #3
    Harry Yarnell is online now Cadillac Owners Fanatic
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    Re: fuel injector removal

    Well after a good nights sleep, it became obvious how it comes apart. Press the little black tab to release the fuel rail at the injector, pry the injector out of its hole, and you can remove the whole assy (rail, 8 injectors, wiring) as a unit.

  5. #4
    Harry Yarnell is online now Cadillac Owners Fanatic
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    Re: fuel injector removal

    Well this thread is two months old, and I'm just getting around to swap out the intake plenum to (hopefully) cure a code 171, 174.
    All other avenues to locate the lean condition have come up clean.
    I cleaned up a plenum from a '96 and used it and its injectors. The '96 had plastic fuel rails; the '97 was steel. Somewhere in the back of my mind I thought there was a recall to replace the plastic ones with steel. Yes/no?...and why. The plastic lines are nicely formed so it's easy to remove the plenum bolts; not so with the steel lines.
    Anyway, no obvious cracks were found on the '97 plenum, BUT there was oily drool coming from the backfire door. Door looked ok, as did the seat, but maybe...this is the vacuum leak.
    Car runs fine; will report back if the codes return.

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: fuel injector removal

    A NHTSA recall went to steel fuel rails.

    Ranger has graphic pictures of why.................. Here's one. Eldorado

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    Re: fuel injector removal

    The recall was for the '95 - '97's. If you still have the nylon rail, get it changed.

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