2001 Northstar - Head Gaskets blown or not?? I'm stumped!! - Page 10
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Northstar Engines and System Technical Discussion Discussion, 2001 Northstar - Head Gaskets blown or not?? I'm stumped!! in Cadillac Engine Technical Discussion; I was mistaken about being interchangable front to rear. 0301 tob 0308 codes identify which cylinder is misfiring, 300 just ...
  1. #136
    jimsbox is offline Cadillac Owners Enthusiast
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    I was mistaken about being interchangable front to rear. 0301 tob 0308 codes identify which cylinder is misfiring, 300 just means a misfire

  2. #137
    hms200 is offline Cadillac Owners Member
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    I don't get a 0301 or 0308...just 0300. You mean one code would indicate left bank and the other would indicate right bank? I'm not aware of any way with my built in to get other data, such as anything down to a specific cylinder number?

  3. #138
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    One code can indicate which CYLINDER is misfiring, i.e. 0301, 0302, 0303.....

    Coil packs and plugs have been mentioned. You've replaced the plugs recently, yes? If so, I'd take it to a big chain auto parts store and see if you can get a definitive answer on the misfire, so you can replace the packs. IMHO, though, I'd replace both and be done with it

  4. #139
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    Your onboard diagnostics will only give you a P0300 code. AutoZone's scanner will point to the offending cylinder P0301, P0302 .P0303, P0304 etc.

    I am pretty sure your ignition cassettes are interchangeable. I think the only difference is the color.

    Have your codes pulled by AZ and then swap cassettes and have then read again. If the misfire follows the cassette, you've found your problem.

  5. #140
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    the cassettes are not interchangeable due to their shape but the ICM inside them is interchangeable between cassettes ... although usually the ICM is fine and the problem lies in the coils

    and getting the specific P030x code is about the only time that you would need to get a scan done at autozone, o'riely, etc
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  6. #141
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    I have two brand new DELPHI coil/ICM cassettes for a 2002 Northstar engine sitting on the bench as I type. They are identical except for color. The ICM's are the same GM P/N.

    If you check the orientation of each cassette you'll see that they're identical. I'll upload pictures of the two side-by-side if necessary. Otherwise look at the thumbnails in RockAuto and or the diagrams in GMPartsGiant.

    FWIW, I picked these two up in '09 when RockAuto blew them out at $108 apiece.

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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    Sub - they are different GM part numbers

    1104076 - left/front/grey
    1104075 - right/rear/black

    the only difference could be the color but that wouldn't make sense... there's got to be some internal difference
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    I could be wrong Chris, but I swear that the only difference is the color. That's probably the reason for the different part numbers.


    Sub,
    You must have a parts store in your garage.

  9. #144
    hms200 is offline Cadillac Owners Member
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    Ok well - this is all very interesting dialog, because I do really want to replace the coil packs - cost having been only reason I've resisted so far.

    Rock Auto current price is $178 (right/black) and $188 (Left/Gray) + shipping - typical 5% discount. This is for the DELPHI (OEM) /w module.

    AutoZone only carries their house brand (Duralast), plus only the Gray (L) one - and they do not specific for Left or Right (just color Gray) - $193

    O'Reilly Auto only carries the Left/Gray only in DELPHI (and they do specific 1 per vehicle, so they are saying Right side only I assume) - $329. They also have L/R in BWD...$194 (R-Gray) and $212 (L-Gray)

    Expensive buggers!!

  10. #145
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    Quote Originally Posted by hms200 View Post
    Ok well - this is all very interesting dialog, because I do really want to replace the coil packs - cost having been only reason I've resisted so far.

    Rock Auto current price is $178 (right/black) and $188 (Left/Gray) + shipping - typical 5% discount. This is for the DELPHI (OEM) /w module.

    AutoZone only carries their house brand (Duralast), plus only the Gray (L) one - and they do not specific for Left or Right (just color Gray) - $193

    O'Reilly Auto only carries the Left/Gray only in DELPHI (and they do specific 1 per vehicle, so they are saying Right side only I assume) - $329. They also have L/R in BWD...$194 (R-Gray) and $212 (L-Gray)

    Expensive buggers!!
    Correction on the O'Reilly BWD colors...intended to say it's Left/Gray & Right/Black...the standard GM color scheme.

    If I do bite the bullet and replace then I do believe I'll go with Rock Auto Delphi.

  11. #146
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    Quote Originally Posted by RippyPartsDept View Post
    Sub - they are different GM part numbers

    1104076 - left/front/grey
    1104075 - right/rear/black

    the only difference could be the color but that wouldn't make sense... there's got to be some internal difference
    There is a 2001 SLS two blocks from here that is running two black cassettes right now, and over the years there have been pictures of 2000+ Northstar engines with a black cassette on the left (2-4-6-8) bank.

  12. #147
    hms200 is offline Cadillac Owners Member
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    Hmm...and as I said in last post, AutoZone only sells one part (the gray one)...assuming qty 2 required per vehicle I guess.

    Oh wait...just checked AZ site again and the note says "Front/Gray".

  13. #148
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    Quote Originally Posted by hms200 View Post
    Hmm...and as I said in last post, AutoZone only sells one part (the gray one)...assuming qty 2 required per vehicle I guess.

    Oh wait...just checked AZ site again and the note says "Front/Gray".
    Any junkyards in the area ?? Northstar coil cassettes are a dime a dozen at a DIY pick-a-part.

  14. #149
    hms200 is offline Cadillac Owners Member
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    Ok - all seriousness aside - I discovered what the true difference is...

    The color coding between the two is special GM instructional design. It's purpose is to help us all better understand which direction the engine goes back in after dropping it to make the mandatory H/G block repairs.

  15. #150
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    Re: 2001 Northstar - Head Gaskets blown or not?? I'm stumped!!

    yeah i guess the color difference would explain the part number difference
    just doesn't make sense as to why the color difference then


    oh well
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