1995 Eldorado Fuel Injector Maintenance Question
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 1995 Eldorado Fuel Injector Maintenance Question in Past Cadillac Vehicle Discussion; Greetings again, I am trying to perform n Injector Flow/Voltage Drop Check in accordance with FSM, Chart 6C-3 page 6C-29 ...
  1. #1
    adc
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    Question 1995 Eldorado Fuel Injector Maintenance Question

    Greetings again,

    I am trying to perform n Injector Flow/Voltage Drop Check in accordance with FSM, Chart 6C-3 page 6C-29

    I'm at the block which requires the following to be done;

    1. SELECT PCM OVERRIDE PS05 (FUEL PUMP RELAY)
    2. PRESS WARMER BUTTON FOR 5 SECONDS
    3. SELECT PCM OVERRIDE PS10 (INJECTOR FLOW)
    4. PRESS 'COOLER' BUTTON UNTIL DESIRED INJECTOR IS SELECTED
    5. PRESS WARMER BUTTON NOTE GAGE AND RECORD PRESSURE DROP ON CHART
    REPEAT ABOVE STEPS FOR ALL 8 INJECTORS

    Every thing goes well until step 4.
    Pressing the "cooler" button doesn't seem to do anything at that point.

    Any thoughts, or advice.

    The "cooler" button does function with the A/C running.

    Thanks in advance.

    Al

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  3. #2
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    Quote Originally Posted by adc View Post
    Greetings again,

    I am trying to perform n Injector Flow/Voltage Drop Check in accordance with FSM, Chart 6C-3 page 6C-29

    I'm at the block which requires the following to be done;

    1. SELECT PCM OVERRIDE PS05 (FUEL PUMP RELAY)
    2. PRESS WARMER BUTTON FOR 5 SECONDS
    3. SELECT PCM OVERRIDE PS10 (INJECTOR FLOW)
    4. PRESS 'COOLER' BUTTON UNTIL DESIRED INJECTOR IS SELECTED
    5. PRESS WARMER BUTTON NOTE GAGE AND RECORD PRESSURE DROP ON CHART
    REPEAT ABOVE STEPS FOR ALL 8 INJECTORS

    Every thing goes well until step 4.
    Pressing the "cooler" button doesn't seem to do anything at that point.

    Any thoughts, or advice.

    The "cooler" button does function with the A/C running.

    Thanks in advance.

    Al
    -----------------------------
    it's been too long since I last messed with a 95 Deville -

    if you want a quick and easy way to test the fuel injectors -

    do an OHM test on each one - replace all that are out of speck -

    or if you want to "play" with the computer -
    do a cylinder balance test - and note the RPM change with each test -
    replace those injectors that show little to no change -

  4. #3
    adc
    adc is offline Cadillac Owners Member
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    Quote Originally Posted by basscatt View Post
    -----------------------------
    it's been too long since I last messed with a 95 Deville -

    if you want a quick and easy way to test the fuel injectors -

    do an OHM test on each one - replace all that are out of speck -

    or if you want to "play" with the computer -
    do a cylinder balance test - and note the RPM change with each test -
    replace those injectors that show little to no change -
    I can check the resistance on the injectors tomorrow. FSM indicates between 8-25 ohms as measured at the main injector harness connector.

    The main reason for my testing is I believe I have a injector that is not operating properly and/or not shutting off completely. Fuel pressure drops over time when the key is off. Not much but does drop. Maybe 7psi in several hours from a nominal 40psi

    I'm not sure just checking resistance on the injectors will indicate a faulty injector that is leaking slightly.

    The FPR and Fuel Pump are new.

    As for the Cylinder Balance Test, I can't find anything in the FSM on that unless it's called something else.

    Thanks for your reply.

    Al

  5. #4
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    Quote Originally Posted by adc View Post
    I can check the resistance on the injectors tomorrow. FSM indicates between 8-25 ohms as measured at the main injector harness connector.

    The main reason for my testing is I believe I have a injector that is not operating properly and/or not shutting off completely. Fuel pressure drops over time when the key is off. Not much but does drop. Maybe 7psi in several hours from a nominal 40psi

    I'm not sure just checking resistance on the injectors will indicate a faulty injector that is leaking slightly.

    The FPR and Fuel Pump are new.

    As for the Cylinder Balance Test, I can't find anything in the FSM on that unless it's called something else.

    Thanks for your reply.

    Al
    ----------------------
    I can check the resistance on the injectors tomorrow.
    FSM indicates between 8-25 ohms
    as measured at the main injector harness connector.

    I thought the resistance of each injector was much "tighter" than that -
    somewhere around 15 - keep looking in the book for the specs -

    As for the Cylinder Balance Test,
    I can't find anything in the FSM on that unless it's called something else.

    it would be in the injector diagnosis area -

    what you do is bring up the RPM display -
    and bring up the injectors -

    with the engine running you shut down one injector at a time -
    and note the RPM change -

    you can also shut down various combinations of injectors -
    1-3-5-7 or 2-4-6-8 etc -

  6. #5
    adc
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    basscatt,

    I found the Power Balance Check procedure in the FSM which looks like what you describe.

    As for the resistance of the fuel injectors, I couldn't find anything else in the FSM, but further reading found that a value of 12-16 ohms should be the norm for this type of fuel injector..

    I have a brand new ACDelco and an old one from a newer Caddy. They both read 12.4 ohms.

    I'll be doing some further testing on the car later today.

    Thanks.

  7. #6
    basscatt's Avatar
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    Quote Originally Posted by adc View Post
    basscatt,

    I found the Power Balance Check procedure in the FSM which looks like what you describe.

    As for the resistance of the fuel injectors, I couldn't find anything else in the FSM, but further reading found that a value of 12-16 ohms should be the norm for this type of fuel injector..

    I have a brand new ACDelco and an old one from a newer Caddy. They both read 12.4 ohms.

    I'll be doing some further testing on the car later today.

    Thanks.
    ------------------------
    I have a brand new ACDelco and an old one from a newer Caddy.
    They both read 12.4 ohms.

    that sounds better -

    and when you test the resistance - you MUST test directly on the injector -
    NOT the entire wiring loom -

  8. #7
    adc
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    Quote Originally Posted by adc View Post
    Greetings again,

    I am trying to perform n Injector Flow/Voltage Drop Check in accordance with FSM, Chart 6C-3 page 6C-29

    I'm at the block which requires the following to be done;

    1. SELECT PCM OVERRIDE PS05 (FUEL PUMP RELAY)
    2. PRESS WARMER BUTTON FOR 5 SECONDS
    3. SELECT PCM OVERRIDE PS10 (INJECTOR FLOW)
    4. PRESS 'COOLER' BUTTON UNTIL DESIRED INJECTOR IS SELECTED
    5. PRESS WARMER BUTTON NOTE GAGE AND RECORD PRESSURE DROP ON CHART
    REPEAT ABOVE STEPS FOR ALL 8 INJECTORS

    Every thing goes well until step 4.
    Pressing the "cooler" button doesn't seem to do anything at that point.

    Any thoughts, or advice.
    In response to my original problem, I found that what really works in the above procedure is;

    1. SELECT PCM OVERRIDE PS05 (FUEL PUMP RELAY)
    1.5. Decrement back down to PS05 as when you select PS05 to OVERRIDE, the display
    increments to PS06, then go to step 2.

    2. PRESS WARMER BUTTON FOR 5 SECONDS
    3. SELECT PCM OVERRIDE PS10 (INJECTOR FLOW)
    3.5. Decrement back down to PS10 as when you select PS10 to OVERRIDE, the display
    increments to PS11, then go to step 4.

    4. PRESS 'COOLER' BUTTON UNTIL DESIRED INJECTOR IS SELECTED
    5. PRESS WARMER BUTTON NOTE GAGE AND RECORD PRESSURE DROP ON CHART
    REPEAT ABOVE STEPS FOR ALL 8 INJECTORS

    Being that it was the first time I had tried any of the PCM Override options, it apparently wasn't all that clear to me.

    But, after reading a little more, and messing around a bit, I stumbled on the solution.

    As for resistance checks I was able to check all injectors (at the injector) and found all to be in spec.
    All read 12.3 or 12.4 ohms.

    I also checked resistance from the Injector Harness connector to each injector and obtained the same result. All read 12.3 or 12.4 ohms.

    Tomorrow I'll try the Injector Flow/Voltage Drop Check and the Power Balance Check.

    Al

  9. #8
    Ranger's Avatar
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    Quote Originally Posted by adc View Post
    The main reason for my testing is I believe I have a injector that is not operating properly and/or not shutting off completely. Fuel pressure drops over time when the key is off. Not much but does drop. Maybe 7psi in several hours from a nominal 40psi

    I'm not sure just checking resistance on the injectors will indicate a faulty injector that is leaking slightly.
    I do not believe it will. If you suspect a leaky injector, just pull the fuel rail with the injectors still attached and turn the key on (DO NOT CRANK). The fuel pump will run for 2-3 seconds to pressurize the fuel system. Now watch for a leaky injector.

  10. #9
    adc
    adc is offline Cadillac Owners Member
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    Quote Originally Posted by Ranger View Post
    I do not believe it will. If you suspect a leaky injector, just pull the fuel rail with the injectors still attached and turn the key on (DO NOT CRANK). The fuel pump will run for 2-3 seconds to pressurize the fuel system. Now watch for a leaky injector.
    That sounds like an direct, and interesting way to check for a leaking injector, but is there enough slack in the Supply & Return lines to lift the fuel rail?

    Another thing I could accomplish with the fuel rail up, I suppose, is to clean the EGR.

    That's the one component in the Fuel/Emissions area that I haven't cleaned yet.

    And, yes...
    Quote Originally Posted by Ranger View Post
    turn the key on (DO NOT CRANK).
    Thanks for the input.


    Al

  11. #10
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    Quote Originally Posted by adc View Post
    is there enough slack in the Supply & Return lines to lift the fuel rail?
    I believe there is. Not so much slack as play in the nylon supply line.

  12. #11
    adc
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    Basscatt,

    It took awhile before I could get back to working in the Caddy.

    Anyway, I recently performed the Injector Flow/Voltage Drop Check and a Power Balance Check which didn't indicate any problem.

    So I moved on to check physically for leaking injectors.

    Quote Originally Posted by Ranger View Post
    I believe there is. Not so much slack as play in the nylon supply line.
    Ranger,

    There was adequate play in the fuel lines, and didn't have too much of a problem pulling the fuel rail up and over slightly to check for any leaking injectors.

    I didn't find any.

    With the fuel rail removed I was able to finally get the EGR Valve off to clean it. I was somewhat surprised that it didn't have any major buildup, and only a sooty residue was seen in the EGR Valve cavity, and there was no major buildup in the passages beneath it.

    It's operation seemed to be okay. By that I mean I could push up on the spring loaded valve and it moved fairly smoothly.

    I figured I might as well shoot some TBI cleaner around the base and clean up anything that might not be visible.

    After checking the injector o-rings, and putting a little oil on them the fuel rail went back without a hitch.

    I next fabricated a spacer to fit between the fuel rail support tab, and the front EGR Valve mounting ear, and replaced the front OEM stud/bolt holding the EGR Valve with a regular hex-head bolt. This will allow me to remove the EGR valve in the future without having to remove the fuel rail.

    I finished installing the EGR Valve and tested everything.

    Well, cleaning the EGR Valve finally corrected my long term problem of "stumbling" on take off.

    Thanks again.
    Al

  13. #12
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    Re: 1995 Eldorado Fuel Injector Maintenance Question

    With the fuel rail removed I was able to finally get the EGR Valve off to clean it. I was somewhat surprised that it didn't have any major buildup, and only a sooty residue was seen in the EGR Valve cavity, and there was no major buildup in the passages beneath it.
    As it should be.

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