1995 Eldorado Northstar Engine Skips
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Northstar Engines and System Technical Discussion Discussion, 1995 Eldorado Northstar Engine Skips in Cadillac Engine Technical Discussion; Hello... I have a '95 Eldorado with a Northstar engine. Recently it is beginning to skip once it has warmed ...
  1. #1
    rochjest is offline Cadillac Owners Member
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    1995 Eldorado Northstar Engine Skips

    Hello...
    I have a '95 Eldorado with a Northstar engine. Recently it is beginning to skip once it has warmed up. Prior to that, engine runs fine.
    I run premium gas, 93% octine. No water in tank. Has 109,000 miles. Service engine light comes on from time to time, but not when this problem occurs. Light has come on from time to time for over a year. Any thoughts?

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    LT5's Avatar
    LT5
    LT5 is offline Cadillac Owners Member
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    Re: 1995 Eldorado Northstar Engine Skips

    Ever do the spark plug's and wire's ?

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    clusco is offline Cadillac Owners Enthusiast
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    Re: 1995 Eldorado Northstar Engine Skips

    Say what you will but since I switched from Premium gas to Regular gas my car has been running much rougher than normal.

  5. #4
    swimmster is offline Cadillac Owners Fanatic
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    Re: 1995 Eldorado Northstar Engine Skips

    i run 87 octane in my 94 eldo and it runs just fine.. runs 14.94-14.97 at the drag strip every weekend. I used to run 92 until the price went thru the roof. Gotta love that Bush family..

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    Re: 1995 Eldorado Northstar Engine Skips

    My 95 SLS has been doing that since I bought it a year ago. I've replaced the wires and plugs w/ Delco's, new injectors and fuel rail...pretty much everything except the coils. My engine vibrates for about 15 seconds when it first starts then kinda smooths out. I've tried premium and regular gas and noted there is no difference in how it runs, I keep with the regular.

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    Re: 1995 Eldorado Northstar Engine Skips

    Quote Originally Posted by Pjs
    My 95 SLS has been doing that since I bought it a year ago. I've replaced the wires and plugs w/ Delco's, new injectors and fuel rail...pretty much everything except the coils. My engine vibrates for about 15 seconds when it first starts then kinda smooths out. I've tried premium and regular gas and noted there is no difference in how it runs, I keep with the regular.
    Check all the grounds.

  8. #7
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    Re: 1995 Eldorado Northstar Engine Skips

    When the engine was out last time I went through the entire wiring harness checking, cleaning and retaping every connector as well as doing a resistance test on the entire harness. I've checked the grounds several times and can't find a problem. I forgot to say that I've even replaced the O-ring on the pressure relief vavle on the front of the manifold thinking that perhaps I was getting leak but that didn't help either. Any other suggestions would be greatly appreciated.

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    Raze's Avatar
    Raze is offline Cadillac Owners Enthusiast
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    Re: 1995 Eldorado Northstar Engine Skips

    Check your intake manifold, there could be a vaccuum leak somewhere. Just try retorquing the bolts when it's cold, I had a rough idle/skip problem that would correct itself once warm and I traced it back to bad intake manifold gaskets. You should also look into your plugwells, is there oil dripping in from the valve covers? Have you tested the coilpack? Hope this helps, goodluck!

  10. #9
    eld1995 is offline Cadillac Owners Member
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    Re: 1995 Eldorado Northstar Engine Skips

    I Get better gas mileage on my 95 eldo when I use premium

  11. #10
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    Pjs is offline Cadillac Owners Fanatic
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    Re: 1995 Eldorado Northstar Engine Skips

    Quote Originally Posted by Raze
    Check your intake manifold, there could be a vaccuum leak somewhere. Just try retorquing the bolts when it's cold, I had a rough idle/skip problem that would correct itself once warm and I traced it back to bad intake manifold gaskets. You should also look into your plugwells, is there oil dripping in from the valve covers? Have you tested the coilpack? Hope this helps, goodluck!
    I've checked the intake thoroughly, installed new gaskets and haven't been able to pinpoint a leak. I've had the engine out and have completely resealed it top to bottom except for headgaskets including new cam covers and plugwell o-rings. The only thing I can think of is the coils but others have said that a coil problem should manifest itself more in the form of a pronounced miss as opposed to a slight miss or skip.

  12. #11
    Raze's Avatar
    Raze is offline Cadillac Owners Enthusiast
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    Re: 1995 Eldorado Northstar Engine Skips

    What code is the car throwing? you said the SES light comes on from time to time. Have you ever stalled?

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