Question about 1999 Buick LeSabre

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99 buick Lesabre

Remember this problem. Cylinder 6 misfire on 99 buick Lesabre. You recommended switching the injector. I finally got around to doing it. I took the rail off and removed the suspected bad injector. The rail was connected to all 6 injectors, so they all had to come out. I moved the bad injector to cylinder number 3 and rebuilt the rail. You were right, it wasn't that difficult removing injectors. The car still runs rough in gear, which I expected. I went back to the store to check the engine code expecting there to be a misfire on number 3. However, the misfire was still on cylinder 6? So my fuel injector is okay. Where do you think I should look now? As a reminder, here's what I've done so far.

1. Replaced all plugs and wires, no change (misfire # 6).
2. Moved ignition coils around, no change (misfire # 6).
3. Moved fuel injectors around, no change (misfire # 6).

Help. Thanks

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  • 2 more comments 
  • silverseven Sep 24, 2008

    Sprayed around cylinder 6 and didn't notice any change. Do you still think we need to check the compression? Can you rent or borrow compression gauges from part stores? If the compression is off, what has to be done? Thanks

  • silverseven Sep 29, 2008

    The car is fixed. I removed the plug to do the compression test and saw that the plug was damaged. The electrodes were touching. This was a new plug, so either I damaged it when installing it or I didn't look close enough when I took it out of the box. I cleaned it up and set the gap and now the car runs great. I appreciated all your help. I learned alot. Thanks

  • Anonymous Mar 15, 2014

    need to know how to remove injector rail on a Holden LG2 motor

  • Anonymous Mar 16, 2014




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Hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.

Posted on Sep 23, 2008

  • paul erickson
    paul erickson Sep 24, 2008

    yea that is what is next. when you do a compression test get your results and then add some oil to cyl 6 and try it again and see what your results are
    let me know



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you just need to remrber at the top of the injector is the fuel rail. that is what hold the injector in place. also remember that the fuel rail has pressure . so you need to be careful . also this area need to cleaned with air pressure . just remember the bottom of the injector sticks right into the intake manifold .there are a couple of bolt that hold the fuel rail in place. remove the bolts and pry off the rail. there is a special oring on the top and bottom of the injector. some times they will come off whenyou pull the injector. so make sure you know where these are at. if you loose one or if they are in bad shape auto part stores have these.. switch your injectors. when you stick the injectors back in you have to pull every injector on that rail. and lube the orings so they will slide into place.
its realy not to hard just takes time and need to be clean good luck.

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