Exhaust System Regeneration in Process Continue Driving
- #4
How does one know that a regen cycle is in progress? Is there an indicator?
- #7
Perhaps your TDI's regen actually had completed before you turned the engine off.
Turns out if the car decides to end its regen (stop the post-injection event) while the engine is idling, the idle will remain elevated until the driver gives some form of accelerator input. The fan speed, on the other hand, will slow down once the DPF has cooled off from the temperatures of regeneration. I think your car's regen was most likely finished since the fans were no longer running at high speed after shutdown; The engine's continued elevated idle most likely tricked you into thinking the regeneration was still under way.
If you tapped the accelerator after you returned to your idling TDI, I think you would have found the idle would return to its usual "non-regeneration" rpm.
TurboDieselPoint
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- #9
Don't leave your car on, it will get stolen.
- #12
.....another good manual transmission feature (built-in anti-theft proteccion).
You made my day K.........
Thanks, ez
- #15
Laughing my ass off! Good point ssamalin I shouldn't leave the car running as there is a chance it will get stolen. This was in Ann Arbor so very good point. Gotta watch out for those Michigan Wolverine students as they're upset lately with their football program. LOL! Bob if I were home in Pinckney I absolutely could leave the car running and not worry. Korab and ezshift5, I too have a stick which I agree is the ultimate anti theft device. LOL! Korab you will definitely smell a little diesel and sulfer smell during the regeneration but it's not too bad. The thing you'll notice more than anything is the rpms at idle. Generally the car idles around 900 but during the regeneration it idles at 1,000. Also the fans go off like you're getting ready for take off on a jet plane. Crazy alarming if you're not prepared for it. But these forums help to the mind at ease.
Ronnie
Question, why do you even have to worry about this? When I park my 2013 and the fans are running, I just turn the car off. Never saw any issues with doing that.
- #16
I've shut mine off during a regen, it'll try again when you restart. Shouldn't be a big deal as long as you do drive it a decent amount at some point so it'll finish a cycle.
- #20
what is regen? Can someone explain? thanks
- #22
Thanks I did not know. Learn something new everyday
- #25
Pretty sure that if you shut the car off the regen stops, even if you restart it right away. However, the fans will continue to run to cool the exhaust down. More important, idling the car will allow oil flow through the hot turbo, cooling it and keeping the oil from coking. That's the big reason people don't want to shut the car down during a regen.
I use my Golf for a fair number of short trips, and tend to let it idle if I make stops going to and from work. No one has stolen it yet. Must be the guard dog. 
And if I pull into work and the fans are running I'll go inside and come back out in 5-10 minutes and then shut it down.
However, I also keep in mind that most drivers aren't going to be as attentive, and the cars seem to survive just fine.
VeeDubTDI
Wanderluster, Traveler, TDIClub Enthusiast
- #26
I use a ScanGauge to monitor exhaust temperatures. It's a sure-fire guaranteed way to know when a regeneration is happening.
www.scangauge.com
More information including specific PIDs to monitor: http://forums.tdiclub.com/showthread.php?t=360498
EGT1 (pre-turbo): This is useful for monitoring warm-up mode and temps going into the turbo. This will change very rapidly as you change the accelerator position. CAT B1S1: This is useful for monitoring regeneration activity. Anything over 1000F is a regen. Boost pressure: This is useful for monitoring boost pressure. You should see 0 PSI with the ignition on and the engine off. You should see a max of 23.0 PSI on a stock tune. Water Temperature: This is useful for monitoring actual water temperature
TXD: 07DF0178
RXF: 054106780000
RXD: 3810
MTH: 00090032FFD8
NAM: EGT
TXD: 07DF013C
RXF: 0441053C0000
RXD: 2810
MTH: 00090032FFD8
NAM: DPF
TXD: 07DF0170
RXF: 054186700000
RXD: 3810
MTH: 00910BB8FF64 (for sea level - you'll need to adjust the last 4 digits if you live at altitude in order to get to 0 PSI with the ignition on and the engine off. Also note that the baseline will change with atmospheric pressure as you change altitude.)
NAM: BST
This is a normal gauge - no XGAUGE required, just cycle through the presets.
Note: The above PIDs are for a Passat. I cannot guarantee how they will work on a Mk7 Golf, but I suspect that they will. It's worth a try.
I won't shut off the engine until both EGT1 and Cat B1S1 are below 450F.
- #27
I'm new to TDI's and do alot of city driving so had been a little worried about making sure that I trigger regens so would make sure that I would take a 30-40 min high speed (120-140km/h) run on the highway at least once per week.
Today I had to make a 80km trip and afterwards smelled a burning rubber type odor that I had read was part of the regen cycle. It only lasted a few minutes, but I had never been so relieved to have my car make such a stink before.
I keep reading advise "drive more worry less" and I'm trying to follow that, but its tough when this whole technology is so new to me. The more I learn about DPF's the more worried I get about it.
So is it inevitable that the DPF will eventually fill with ash and need to be replaced? No ability to just clean the filter and keep using it (even on the new/current year models)?
VeeDubTDI
Wanderluster, Traveler, TDIClub Enthusiast
- #28
I'm new to TDI's and do alot of city driving so had been a little worried about making sure that I trigger regens so would make sure that I would take a 30-40 min high speed (120-140km/h) run on the highway at least once per week.
Today I had to make a 80km trip and afterwards smelled a burning rubber type odor that I had read was part of the regen cycle. It only lasted a few minutes, but I had never been so relieved to have my car make such a stink before.
I keep reading advise "drive more worry less" and I'm trying to follow that, but its tough when this whole technology is so new to me. The more I learn about DPF's the more worried I get about it.
So is it inevitable that the DPF will eventually fill with ash and need to be replaced? No ability to just clean the filter and keep using it (even on the new/current year models)?
If you install a ScanGauge (or Ultra Gauge, Torque, etc.), you can easily monitor regeneration activity.
VeeDubTDI
Wanderluster, Traveler, TDIClub Enthusiast
- #30
Sweet info VeeDubTDI! I'm gonna pick up a scan gauge and start using it for this type of stuff!
Ronnie
Cool. Let us know if those PIDs work.
Source: https://forums.tdiclub.com/index.php?threads/regeneration-dos-and-donts.429842/