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Old 10-11-2010, 08:53 PM
Mr. Ed Mr. Ed is offline
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Default Regeneration Question

Hello, guys,

I'm temporarily in a position where my truck isn't driven daily as far as it used to be. Because of this I've gotten the "DPF 80% full" message on the EVIC three times in a little over two weeks. Each time, I drove on the nearby intestate until the message went off. IOW, the cleaning procedure is operating as it should.

My question is: can regeneration take place at lower speeds and higher RPM's or does the truck have to be traveling over 55 MPH? I had the J35 reflash performed and I believe it may have addressed this issue but am afraid to put it to the test.

The reason I ask is because I find myself in a position occasionally when I can't get the truck to an interstate or other highway in reasonable time where I can drive at higher speed and I'm afraid the DPF will continue clogging until it's too late (99% full).

So, does slow speed/higher RPM's equate with high speed/lower RPM's when it concerns regeneration? Thanks..
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Old 10-13-2010, 09:39 AM
erm
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Exhaust speed/velocity and operating temp will clear the DPF. So that means you can run in a lower gear/higher RPM around town and achieve the same thing as highway cruising. I also believe that you should do this for a specific period of time. I have not seen anything definitive on what that time is.

What I'd do is run it until the warning light goes off, then go for a bit more, say 15 minutes (just a guess here) past the time it goes off.
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Old 10-13-2010, 09:47 AM
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You may need yet another flash that allows the dealer to perform a stationary regeneration procedure. It's possible the mobile regen isn't finishing and that's why you keep getting the 80% indication.
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Old 10-13-2010, 07:03 PM
Mr. Ed Mr. Ed is offline
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Default

Thanks, guys. I may try the "slow speed/higher RPM's" tactic next time I get the message since I'm very close to the interstate and can immediately get on it if the tactic fails and I see the percentages going up.

BTW, I have all the latest flashes, including J35, so I believe the frequent regens may be due to the local driving plus the fact it's getting cooler in the mornings here (Deming, NM).

Additionally, I'm a little suspicious of the fuel I put in my tank a few weeks ago. It had a whitish color as opposed to the greenish hue I'm used to seeing. Perhaps it was LSD instead of ULSD, although the pump was labeled ULSD. I'm just guessing here but the fuel color (or, lack of it) raises my suspicions.

You're correct when you stated that the vehicle should be driven for a while longer AFTER the EVIC warning goes out. I haven't been doing that. So, mayb e everything is normal after all.
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