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Northstar Engines and System Technical Discussion Discussion, Name That Part in Cadillac Engine Technical Discussion; I have yet to locate a FSM and since I am still under warranty I am not in a big ...
  1. #1
    Ranger's Avatar
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    Name That Part

    I have yet to locate a FSM and since I am still under warranty I am not in a big hurry, but I see two items under the hood that I am unsure of. I think these are the same for all post 2000 Northstars.

    The first is a square module mounted dead center on the firewall. Since the 2000+ has COP (Coil On Plug) vs the coils mounted on the ICM, I suspect this is the ICM.

    The second one, I am clueless. Looking at the firewall from the front of the car, Just to the left of the previously mentioned module there is a valve of some sort mounted on the rear cam cover. It has a vacuum hose on the top of it, what appears to be a rubber coolant hose (about 3/4 - 1" in diameter) off the side (may not be coolant) and a corrigated flexable aluminum tube (like the EGR tube) off the bottom. What is it?

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  3. #2
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Name That Part

    y2k northstar's don't have an ICM as far as I'm aware. The coilpacks plug straight into the PCM.

    The second "valve" sounds like something that has to do with the PCV, but hard to tell without pics.

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    Re: Name That Part

    I just changed my spark plugs on the car, and am aware of the part you speak of. I am not sure what it is, but looks like it has something to do with the EGR. It has the flex pipe that EGR's normally have, and the vacuum ports also. I will search a bit, and see what i can come up with.

    Don

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    Re: Name That Part

    Quote Originally Posted by eldorado1
    y2k northstar's don't have an ICM as far as I'm aware. The coilpacks plug straight into the PCM.
    Something still has to tell the coils when to fire. That would be the ICM, right?

  6. #5
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Name That Part

    Quote Originally Posted by Ranger
    Something still has to tell the coils when to fire. That would be the ICM, right?
    Nope, the PCM tells the coils when to fire. Before, the crank and cam sensors went to the ICM, but y2k brought about the elimination of the ICM... So the crank and cam sensors go straight to the PCM, along with the control of the coils.

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    Re: Name That Part

    OK, in that case, I have no clue on either part. No one knows? No one with a manual?

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    Re: Name That Part

    The part over the cam cover is the secondary air vent solenoid. I have no idea what it is for though.

    Don

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    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Name That Part

    sounds like a handy thing to have in case the primary air vent solenoid cops out on you...

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    Re: Name That Part

    "Secondary air vent solenoid"? The plot thickens.

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    Re: Name That Part

    Quote Originally Posted by Ranger
    "Secondary air vent solenoid"? The plot thickens.
    Maybe secondary AIR vent solenoid makes more sense?

    Don

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    Zorb750 is offline Cadillac Owners Connoisseur
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    Re: Name That Part

    AIR as in Air Injection Reaction?

    Smog system?

  13. #12
    WOTMODE is offline Cadillac Owners Fanatic
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    Re: Name That Part

    Secondary AIR injection is just like old AIR pumps on '70s and '80s cars except it has an electric pump and electronic controlled solenoids and valves. It doesn't hurt power, only helps pollution. To mess with will turn on check engine light.

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    Re: Name That Part

    OK, upon further inspection, the module mounted on the firewall is for the cruise control. I noticed a cable coming out og the side that I didn't see the first time, and it runs to the throttle linkage.

    The secondary air vent solenoid, as Dadillac called it has a twin. She is mounted just behind the radiator under the radiator hose, between the water pump pully and the air box. What I thought was a coolant hose appears to be an air hose and the corrigated flex pipe under is runs to the appropriate exhaust manifolds. As mentioned, it appears to be vacuum operated and I see no electrical connections so I don't know how they could call it a solenoid. At any rate, it does appear to be supplying fresh air to the exhaust manifold as the old A.I.R. pumps used to. What I can't figure out is where the supply is coming from and how it overcomes exhaust manifold pressure to keep the flow from backing up as I could see no pump of any sort. I gotta get a FSM.

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    Re: Name That Part

    Quote Originally Posted by Ranger
    OK, upon further inspection, the module mounted on the firewall is for the cruise control. I noticed a cable coming out og the side that I didn't see the first time, and it runs to the throttle linkage.

    The secondary air vent solenoid, as Dadillac called it has a twin. She is mounted just behind the radiator under the radiator hose, between the water pump pully and the air box. What I thought was a coolant hose appears to be an air hose and the corrigated flex pipe under is runs to the appropriate exhaust manifolds. As mentioned, it appears to be vacuum operated and I see no electrical connections so I don't know how they could call it a solenoid. At any rate, it does appear to be supplying fresh air to the exhaust manifold as the old A.I.R. pumps used to. What I can't figure out is where the supply is coming from and how it overcomes exhaust manifold pressure to keep the flow from backing up as I could see no pump of any sort. I gotta get a FSM.
    When ever I go on ebay I've been on the lookout for one(fsm) for ya. If one comes along I will let you know.

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    Re: Name That Part

    Thanks Al. Much appreciated. I check from time to time myself, but those '02's are scarce as deer on opening day.

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