Northstar Intermittent misfire-Pulling hair out!!

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Northstar Engines and System Technical Discussion Discussion, Northstar Intermittent misfire-Pulling hair out!! in Cadillac Engine Discussion; Northstar Intermittent misfire-Pulling hair out!! Now what? My 96 Eldorado (60,000 miles) still has an intermittent misfire on #1 cylinder. ...
  1. #1
    KrazyK55's Avatar
    KrazyK55 is offline Cadillac Owners Member
    Automobile(s): 1996 Eldorado
    Join Date
    Jun 2003
    Illinois (Metro St. Louis MO A

    Northstar Intermittent misfire-Pulling hair out!!

    Northstar Intermittent misfire-Pulling hair out!!

    Now what? My 96 Eldorado (60,000 miles) still has an intermittent misfire on #1 cylinder. The darn thing might run fine for weeks at a time and never miss a lick then when you least expect it, it starts missing again. When it sets a code it is always #1 cylinder misfire.
    One thing you can bet on, it darn sure will not misfire when you take it to a tech to be checked out! 3 trips to the shop, ran great all 3 times.

    So far I have installed New AC plugs properly gaped and installed, New Factory plug wires, replaced the coil pack with factory A/C Delco replacement. Engine idles fine but misses sometimes on acceleration or when pulling a slight grade. The misfire usually occurs below 3000 RPM. There have been a couple of times that the engine sounded like it backfired just as the misfire started. (Fuel injector maybe?) I have preformed all of the different suggested test that I have seen on the forum with no negative results and have now resorted to parts changing as a last ditch effort. Next comes the 16 lb sledge or maybe a trip to the crusher. LOL

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  3. #2
    haymaker is offline Cadillac Owners Fanatic
    Join Date
    Sep 2004

    Re: Northstar Intermittent misfire-Pulling hair out!!

    Try swapping the #1 injector with #3 injector to see if the miss follows that injector.

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