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Cummins isx 400 st wobbles!

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Hush, Oct 27, 2013.

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  1. Oct 29, 2013 #11
    Hush

    Hush Bobtail Member

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    Oct 27, 2013
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    Dropped the truck of at the shop, will know something by tomorrow. Will update then, hopefully they willf ind the problem.
     
    Hush, Oct 29, 2013
    Hush, Oct 29, 2013
    #11
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  3. Nov 4, 2013 #12
    Hush

    Hush Bobtail Member

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    Oct 27, 2013
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    Well, got my truck back, still wobbles like a drunk. The shop tightened the yoke, but said the bearing on the transmission is bad!?

    Fan, fan hub and balancer are all good, so are the engine mounts.

    400 dollars of diagnostic time found nothing wrong with the engine! Although it still has a rough idle!

    I guess the mechanic can't start the truck and sit in it for a minute or two!

    My only option is to change the bearing, but I have no idea how that effects my idling?

    They said I could run my truck for a while before needing to replace the bearing. So that is what I am doing.
     
    Hush, Nov 4, 2013
    Hush, Nov 4, 2013
    #12
  4. Mar 19, 2016 #13
    michael tretter

    michael tretter Bobtail Member

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    Mar 19, 2016
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    I am having similar issues with my '12 Volvo. Rough idle when cold. Smoothes out after reaching operating temp
    Any ideas? Oh, 470k miles
     
    michael tretter, Mar 19, 2016
    michael tretter, Mar 19, 2016
    #13
  5. Mar 19, 2016 #14
    beckstr

    beckstr Bobtail Member

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    Feb 9, 2013
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    Its injectors. Well at least one . Cut out test wont tell you which one if you run it when warm .
     
    beckstr, Mar 19, 2016
    beckstr, Mar 19, 2016
    #14
  7. Mar 19, 2016 #15
    Pablo-UA

    Pablo-UA Road Train Member

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    Borispol, Ukraine
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    but I'd check solenoids too.....
     
    Pablo-UA, Mar 19, 2016
    Pablo-UA, Mar 19, 2016
    #15
  8. Mar 19, 2016 #16
    taxihacker66

    taxihacker66 Road Train Member

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    Feb 26, 2012
    Concrete jungle.
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    When I start my 06 isx when it's cold it( "hunts"KW mechanic term) idles rough. We did injector cut out test(cold engine) and they were fine. Was told it was the timeing solenoids.
     
    taxihacker66, Mar 19, 2016
    taxihacker66, Mar 19, 2016
    #16
    Straight Stacks Thanks this.
  9. Mar 19, 2016 #17
    Tug Toy

    Tug Toy Road Train Member

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    What do the solenoid actually do? I have an isx and just curious? I have asked a few mechanics and have not gotten a clear answer?
     
    Tug Toy, Mar 19, 2016
    Tug Toy, Mar 19, 2016
    #17
  10. Mar 19, 2016 #18
    taxihacker66

    taxihacker66 Road Train Member

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    Concrete jungle.
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    Two are timing metering solenoids ,two are fuel metering solenoids and one in the middle is for shutting the fuel on and off.
    download.jpg
     
    taxihacker66, Mar 19, 2016
    taxihacker66, Mar 19, 2016
    #18
    yb226, Tug Toy and Straight Stacks Thank this.
  11. Mar 19, 2016 #19
    Tug Toy

    Tug Toy Road Train Member

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    Yea thanks, I know that. I am curious at to there actual function? I see there are 3 holes on the back side of them. I pulled and cleaned my shutoff valve this weekend and it works much better. My truck idle a little funny and cummins said it would be the fuel metering solenoid. Just curious what they actually do?
     
    Tug Toy, Mar 19, 2016
    Tug Toy, Mar 19, 2016
    #19
  12. Mar 19, 2016 #20
    taxihacker66

    taxihacker66 Road Train Member

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    Feb 26, 2012
    Concrete jungle.
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    My understanding is the two timing solenoids use fuel pressure to adjust the timing on the engine. The two fuel metering solenoids adjust the amount of fuel?
    @Smellfunny would be the guy that could answer that question.
     
    Last edited: Mar 19, 2016
    Reason for edit: Spilling
    taxihacker66, Mar 19, 2016
    taxihacker66, Mar 19, 2016
    #20
    Tug Toy Thanks this.
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