need help with rough running northstsar
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Northstar Engines and System Technical Discussion Discussion, need help with rough running northstsar in Cadillac Engine Discussion; hi My daily driver is a 01 eldorado with the northstar engine. today i installed new fuel injectors ,fuel pressure ...
  1. #1
    FREDFLYPOGGER is offline Cadillac Owners Member
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    need help with rough running northstsar

    hi
    My daily driver is a 01 eldorado with the northstar engine. today i installed new fuel injectors ,fuel pressure regulator,new intake gaskets., and while i was at it i installed a starter as well. it went back together pretty easy but when i started it ran very rough,stumbling. it stays running, but like i said it idles very very rough. i double checked all my connections,it did set a code p308 cylinder 8 misfire. I almost seems like the map sensor or maf sensor isn't connected but they are. could it be the wrong injectors? i checked the part #'s and they were identical to the old ones. i am lost here. any help would be appreciated.
    UPDATE
    swapped back the old injectors and the car runs great. Bought these injectors for $90 on ebay, i guess you get what you pay for. i was suspicious when the boxes weren't GM. ordered a new set from rock auto.


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  3. #2
    ternstes is offline Cadillac Owners Fanatic
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    Re: need help with rough running northstsar

    What lead you to install all new fuel injectors? I would check the #8 fuel injector, make sure it pulses with the car running. Check for vacuum leaks as well around the intake.

  4. #3
    FREDFLYPOGGER is offline Cadillac Owners Member
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    Re: need help with rough running northstsar

    hi
    now i am getting p0300 random / multiple cylnider misfire. ran a little better but still rough. which is cylinder 8 ? can't find a diagram in the service manual
    thanks
    todd

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  6. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: need help with rough running northstsar

    #8 should be the front drivers side

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  7. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: need help with rough running northstsar

    FRED, Click on my username, open my profile - left column, 2 picture albums - 6 pages of pics, diagrams, and notes on our engines.

    .............and remove your e-mail from your post.

  8. #6
    ternstes is offline Cadillac Owners Fanatic
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    I don't get it. If your car is running fine now, why replace the injectors again?

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