My truck has sneezing fits

Discussion in 'Trucks [ Eighteen Wheelers ]' started by MTMAUS, Dec 12, 2021.

  1. MTMAUS

    MTMAUS Light Load Member

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    Sep 28, 2019
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    My truck was purging every 30secs, international 9200i, with a cummins ISX pre egr. It had been a while since the dryer was done, it has a AD9 dryer, I replaced the D2 governor, dryer cartridge, check valve and purge valve. I thought I solved the issues, as when the truck is idling it cuts in and out fine. And purges normally, not every 30secs like before.

    But when cruising on the highway it does something weird. It will cycle properly 2-3 times, as in cut in at correct PSI, then cut out at correct PSI and purge. But every 2-4 cycles it will have a weird cycle we're it will build pressure to cut out PSI but then will purge 8-10 times in 30 - 45 secs.

    Once it has its purging fit it then goes back into a normal cycle. I can't seem to predict when it will purge alot and the purges are always different amounts.

    Doesn't do this when idling, it will cut in, cut out, purge and then when the pressure drops back down it will cut in and cycle properly.

    Any ideas?
     
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  3. Jacoooooooo

    Jacoooooooo Heavy Load Member

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    Is the engine fan air operated? If so check there for leaks.
     
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  4. Goodysnap

    Goodysnap Road Train Member

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    Was the new governor Bendix? If not, I would try that first. Is the issue repeatable every time at the same drive time or random when it feels like it.

    Can you provide ESN.

    Next thought for me would be the unloader valve in the compressor sticking.
     
    Heavyd, Flint1 and Hammer166 Thank this.
  5. MTMAUS

    MTMAUS Light Load Member

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    Yes Governor was a bendix D2, am back on the road today will have a better chance to monitor it for a pattern
     
  6. MTMAUS

    MTMAUS Light Load Member

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    Sep 28, 2019
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    So, it does this.

    Builds air, purges, then has 1 correct cycle, then on second cycle it purges 4-5 times.

    Rinse and repeat, why would it purge multiple times every second cycle? But not the first cycle?
     
  7. Oxbow

    Oxbow Road Train Member

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    I don't know the answer, but I would do as @Goodysnap suggested and check the unloader valves. They can get gunked up make the system act weird.
     
    Goodysnap Thanks this.
  8. Goodysnap

    Goodysnap Road Train Member

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    Some info-

    I have the cleaning kit. Sometimes it works, usually not a permanent fix tho.

    This is usually more of a problem on Early EGR engines with high idle.
     

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    Last edited: Dec 16, 2021
    Heavyd and Oxbow Thank this.
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