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Thread: Another CPI How-to

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  1. #1
    Insane Network Engineer rlith's Avatar
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    Another CPI How-to

    So I was having problems starting...(Mainly I'd have to prime the system before starting). My fuel economy dropped from 20 mpg local to 12 mpg local, this was significant and that much of a drop I could not attribute to winter gasoline formulas. I knew it was the CPI

    This how-to will focus on changing out of the regulator only though it can be applied to swapping the entire CPI... Typically it's the regulator that goes bad, but because of how detrimental this part is to running, I wouldn't advocate buying this part online. Since the regulator is now available at most autoparts stores from Help! Part #55162, it's much easier to swap out a defective unit.

    Tools needed.

    10mm deepwell socket (Must be a deep well)
    8mm socket
    T30 Torx Bit
    Paper towels
    Either a complete CPI
    or
    Help! Part # 55162 (the reugulator) Includes the needed Torx security bit for retainer removal. (About $40.00 at Autozone, Pepboys, or Advance autoparts)
    New plenum gasket.

    First remove your intake air feed and disconnect the air temp sensor. Then remove the 2 bolts holding the VORTECH cover on. (The bolts holding this on are T30)

    Here you can see where I disconnected the air intake temp sensor and started loosening the cover bolts


    Next Disconnect the linkage from the throttle butterfly and remove the 2 8mm bolts holding the top of the cable bracket to the upper intake.

    Disconnect all sensor connectors and move them out of the way.

    Using your 10mm deepwell socket, Starting with the bolt holding the bracket, work your way around the plenum. There are 9 bolts to be removed. As you get to the bracket holding 1st the coil bracket and then on the opposite side the fuel recovery module, you 1st need to remove the 2 top nuts then set the bracket out of the way then remove the bolt(s) holding the plenum down.

    As you remove these bolts (and nuts) Lay them out in order. Several of the bolts are different sizes, so if you lay them out in order, you can simply put them in reverse.

    Disconnect the small vac hose from the back of the plenum, then the larger hose at the brake booster.

    Lift the plenum straight up.

    Here we see that the passenger side of the upper plenum is very washed (note the gold covering)



    Here we have the lower intake. Note that the passenger side is almost clean while the driver's side with the nutkit is nice and dirty.



    Next I stuffed all the intake ports with paper towels. Why? Becuase you DO NOT want to take the chance of dropping something down there. (Last time I did I destroyed a motor, :D)



    Here is a shot of the regulator SImply remove the 2 screws holding the retaining ring on. (Help! was thoughtful enough to provide the security Torx bit needed to do this)



    A shot of the retainer ring removed


    A shot of the new regulator (left) and the old one (right)


    Here is the new regulator on the CPI (pre retainer installation)


    Now make sure that the mating area is completely clear of any old gasket material. If needed, use a razor blade to scrape the mating surface. For some areas if too difficult, use sand paper.

    A final shot prior to putting it back together w/ the new plenum gasket


    Simply reinstall everything in reverse

    Starting at the bolt at the bracket, torque in circular patter to 8 ft pounds

    Wala your're done!

    Note: Prior to putting it back together, it's a good time to pull the distributor cap and check the condition of your cap and rotor. The reason I mention this is because of how difficult it is to get to that front screw.
    Support Sattelite Radio! Goto www.siriusbackstage.com
    goto http://www.pghconsulting.net/teal to see my updated pics!
    ____________________________
    95 S10 Blazer 4x4, Vortech CPI, EGR mod, 99 Centerconsole w/ shifter, , 2001 Extreme zq8 steering box, Pioneer head unit, Leather interior

    -- I won't bag it and/or drop it, because face it, I'm too old to have a ghetto-mobile
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  2. #2
    Upright Member smsmith36's Avatar
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    Very good "How to". It should be a sticky. I'm glad you mentioned the torque of 8 lbs. Someone not familiar with aluminum could really bare down on the bolts and strip their threads out. The only thing I did differently is I didn't remove the cable from the throttle butterfly. You can sit it off to the left side over the AC - heater box with the cable still hooked up.
    Genius by birth, Slacker by choice.

  3. #3
    Zombie Killer 6SpeedBlazer's Avatar
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    can we get a mod to sticky this?

  4. #4
    SENIOR MEMBER JERM's Avatar
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    and then what about the newer motors?

    on my 98 i have two intakes, a plastic high rise on top of the metal one down in the middle.
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  5. #5
    Insane Network Engineer rlith's Avatar
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    Originally posted by JERM
    and then what about the newer motors?

    on my 98 i have two intakes, a plastic high rise on top of the metal one down in the middle.
    Same principal. But in your case it's more than likely your regulator unit inside the plenum. You have a different design than the CPI. So just pull the upper plenum and check for puddling.
    Support Sattelite Radio! Goto www.siriusbackstage.com
    goto http://www.pghconsulting.net/teal to see my updated pics!
    ____________________________
    95 S10 Blazer 4x4, Vortech CPI, EGR mod, 99 Centerconsole w/ shifter, , 2001 Extreme zq8 steering box, Pioneer head unit, Leather interior

    -- I won't bag it and/or drop it, because face it, I'm too old to have a ghetto-mobile
    "I live with 2 retards and a deaf person.....It's not so bad..." --Grandma

  6. #6
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    What does 'Sticky' mean?
    How do you make pictures show up in the post?

  7. #7
    Registered User Kraker_Jax's Avatar
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    Awesome sticky! Very helpful when I did this yesterday, took me just over an hour! Let's see that mileage get back up!
    tame the devil under your feet
    '94 4DR 4X4 CPI
    -5" drop
    -GMC Grille

  8. #8
    Registered User ssilk12001's Avatar
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    Could this cause my idle to rev up and down and make the service light come on. It barley idles right now!

  9. #9
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    Proper maintenance of your car's engine is essential for optimum performance. If your engine is misfiring it will decrease mileage. If the engine oil and filter changes have been neglected it will cause additional friction inside the engine and hinder the performance and gas mileage. Finally, remove all un-necessary objects from the car, added weight can decease mileage also inspect your engine service records and perform a tune up or oil change as recommended. Following these gas saving tips can increase your mileage and save you money.

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