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  1. #1
    Road Train Member
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    how long does the regen take

    on an 09 pete with 07 isx475. and how do i know when it's done.

    never drove a regen truck before and i'm sitting here idling at 1100 with the high exhaust light on. been running for an hour now.


  2. #2
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    nm. i just answered my own question. took 1 hour and 15 minutes.

  3. #3
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    Only 1100 rpm probably ins't enough to regen. My cat cooks at about 1400. That HEST light comes on if you stop driving when it is in the middle of a cycle. It isn't good to stop it in the middle of a cycle but it won't hurt the DPF unless you do it all the time, say in a dump truck application. That light only comes on to serve as a warning to not park on top of something like very dry grass that may catch fire. You only need to do a manual regen when the engine asks for it, which *hopefully* is rare. And when you do, you gotta do the whole park, release brakes, park, maybe clutch on some, cruise off, then push the start regen button for about 5 seconds.

  4. #4
    Road Train Member Heavyd's Avatar
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    1100 is normal rpm for a Cummins regen. Cats are not the same engine as a Cummins, that is why it is at a different rpm. With the VGT turbos on a Cummins they close them to about 89% to increase exhaust back pressure, which increases load on the engine, which increases exhaust heat. 1100 is fast enough. Regens can last up to 2.5 hours with an ISX. 40 mins is about average. Keep track as best you can how long they are taking. If you find they are increasing in time the regen efficiency is starting to diminish. This can be due to a few reasons, but a partially plugged doser injector tip is usually the first thing to look at.

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    Starting to get tiref of this light now. Comes on just idling for a nap. But this morning i actually had to do the process. Usually it just goes off. Not this morning. No power

  6. #6
    Road Train Member Cat sdp's Avatar
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    Keep us posted. If truck is asking for a manual regen that's usually not a good sign.

  7. #7
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    i'm thinking it may have something to do with excessive water in flying j fuel. which is our source.

    i'm getting WAY more steam then other trucks. when them temps drop. and i've got a lot of yellow ice underneath the mufflers now. from idling.

    i pulled into a rest area at the montana idaho state line. kick on the regen. felt sorry for the trucks around me. but when i woke up 5 hours later. the truck is idling normal and no light since.

    hopefully it's just a sub zero thing. and will go away when the temps starting rising. and steam stops blowing out the exhaust.

  8. #8
    Bobtail Member
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    How will the truck act when it's doing it's own regen?
    I just started a new job and first experiences with emissions. Its a '11 pete and cummins isx 485engine. No lights or anything are present on the dash, but I noticed after one off load today (I pull a dump trailer)the truck suddenly seemed touchier I guess. I'd let the clutch out and it would bounce around like I just dumped it, lots of the shifts seemed tighter/harder to make much like when the engine fan is on sucking power(it wasn't, its obvious when that is roaring)
    Also at very slow speeds or idling at a light it sounded like the turbo was going up and down more, I didn't think to look at the boost gauge tho.
    Truck overall ran and pulled 110k fine, but after putting an effortless 250 miles on early the last 100 weren't as smooth.. I mentioned it to my manager and he thought it could be a regen but wasn't sure...Thoughts?

  9. #9
    Road Train Member Heavyd's Avatar
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    Definitely not at regen. First of all, make sure you fully understand what all the regen lights mean. There should be label behind the sun visor with explanations and instructions of what to do. Sometimes the engine will be doing a "passive" regen during driving which requires no action at all from the driver. The only indication that it is in progress is the high exhaust temperature light will be on when you are driving slower than 5 mph. When a passive regen is in progress you should notice nothing with engine performance, this normally happens when you are driving at highway speeds. The other type of regen is an "active", or "parked" regen, which is when you must parked and let the engine do it's own thing.

  10. #10
    Hopper Heartache Drifter42's Avatar
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    The T660 I drive with a cat usually runs around 1400 rpm and regens 30 to 45 minutes.

    Sent from my DROID RAZR using Tapatalk 2

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