Bad missing after running out of fuel!
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Bad missing after running out of fuel! in Past Cadillac Vehicle Discussion; Ok... So the bad fuel float issue on my 2000 Seville STS caught up with me Monday and I ran ...
  1. #1
    vincent12773 is offline Cadillac Owners Member
    Automobile(s): 2000 STS
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    Bad missing after running out of fuel!

    Ok... So the bad fuel float issue on my 2000 Seville STS caught up with me Monday and I ran out of gas on the freeway. After putting some fuel in it, it ran like crap. Almost like it was running on 7 cylinders. I figured I'd dragged crap from the tank bottom into my fuel system so I replaced the fuel filter. Also put sea foam in the fuel to help break up anything that might have passed through. Still ran horribly all day. Came home today and pulled the ignition coils to remove and check plugs (new a year ago). All there seemed fine as well...

    Question... The rear Ignition coil bank is still original (150,000 miles). Could the stuttering if the engine as it was low on fuel finish off one of those coils? Is there any way to check a coil out? It doesn't seem so. Is there anything else I might be missing? Thanks for any advice! Oh yeah... Only code history or current was p0300. Yeah, no kidding!

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    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: Bad missing after running out of fuel!

    Quote Originally Posted by vincent12773 View Post
    Ok... So the bad fuel float issue on my 2000 Seville STS caught up with me Monday and I ran out of gas on the freeway. After putting some fuel in it, it ran like crap. Almost like it was running on 7 cylinders. I figured I'd dragged crap from the tank bottom into my fuel system so I replaced the fuel filter. Also put sea foam in the fuel to help break up anything that might have passed through. Still ran horribly all day. Came home today and pulled the ignition coils to remove and check plugs (new a year ago). All there seemed fine as well...

    Question... The rear Ignition coil bank is still original (150,000 miles). Could the stuttering if the engine as it was low on fuel finish off one of those coils? Is there any way to check a coil out? It doesn't seem so. Is there anything else I might be missing? Thanks for any advice! Oh yeah... Only code history or current was p0300. Yeah, no kidding!
    --------------------
    Could the stuttering if the engine as it was low on fuel
    finish off one of those coils?

    no - the coil could care less whether there is fuel present or not -

    Is there any way to check a coil out?
    not without a TECHII -

    Is there anything else I might be missing?
    the fuel pump is cooled by being submirged in gasoline -
    it's possible the FP has been "hurt" by running with an almost empty tank -
    what is the fuel pressure at idle - it should be around 45PSI -



    Only code history or current was p0300

    I suggest having someone - autozone - etc - check the codes -
    the P0300 is a generic misfire codes -
    and our on-board scanners will not give the specific cylinder -
    a hand-held scanner will - P0301=Cylinder #1 - P0302=Cylinder #2 - etc -

    --------------------

  4. #3
    vincent12773 is offline Cadillac Owners Member
    Automobile(s): 2000 STS
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    Cleveland Ohio
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    Re: Bad missing after running out of fuel!

    Thanks Basscat... I never knew that about the on board diagnostics. I have a code reader and hooked it up... P0303... Cylinder #3 misfire. Need to find out which one that is and then what? Check plug again? Coil? Is impossible junk got by the fuel filter and plugged the injector?

  5. #4
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: Bad missing after running out of fuel!

    Quote Originally Posted by vincent12773 View Post
    Thanks Basscat... I never knew that about the on board diagnostics. I have a code reader and hooked it up... P0303... Cylinder #3 misfire. Need to find out which one that is and then what? Check plug again? Coil? Is impossible junk got by the fuel filter and plugged the injector?
    ---------------------
    1-3-5-7
    2-4-6-8
    front

    Is impossible junk got by the fuel filter and plugged the injector?
    ya - pretty unlikely - unless the fuel filter disintegrated - also pretty unlikely -

    I would first test the fuel pressure at the fuel rail -

    then OHM out the injectors -

    if it were a coil problem - you could swap coils -
    if the misfire goes to #6 - the coil is bad -

  6. #5
    vincent12773 is offline Cadillac Owners Member
    Automobile(s): 2000 STS
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    Cleveland Ohio
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    Re: Bad missing after running out of fuel!

    Thanks again Basscat... I didn't realize the coil banks were identical. I switched them and, yep, it then threw a p0306 code. Bad coil. Must have been a fluke'

  7. #6
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
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    Re: Bad missing after running out of fuel!

    Quote Originally Posted by vincent12773 View Post
    Thanks again Basscat... I didn't realize the coil banks were identical. I switched them and, yep, it then threw a p0306 code. Bad coil. Must have been a fluke'
    ----------------------
    don't we all wish diagnosis was ALWAYS that easy - and 100% positive -

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