Diabolis

Any diesel or exhaust smell is due to a defect or malfunction. Period. They didn't smell before the AEM, and they certainly don't after. If you are smelling anything, something is not right.

00Coupe

When the engine is cold, these cars smell..(running in park)

During regen, you cannot breathe near the car.Its always been like that.

The only tolerable smell while parked is once its at full temp.

Im not sure if its worse after AEM but it definitely stinks when its cold.

My solution is to get in and drive. No idle...Then no smell..

Diabolis

You - or rather your car - has a problem. There is no smell near any normally functioning Bluetec.

00Coupe

perhaps the smell is subjective. Alot have lost their sense of smell last few years..😀

These diesel smell topics are all over the internet.

A friend has a 2015 VW diesel and during regeneration you cannot stand behind the car.

My car doesn’t burn any oil, no CEL, so I have no reason to believe that there is anything wrong. When fully warmed up, its extremely faint (if you’re behind an idling car, almost not noticable)

Since you’re in Toronto, I can stiff your exhaust sometime to compare.😆

As a starting point, do you know when a regen is occurring? Have you been outside of a running car during regen?

Diabolis

LOL re sniffing exhaust... get your nose outta my rear end.

The VWs do stink because they completely lack any exhaust after-treatment system (I'm sure you're familiar with "dieselgate") and you're absolutely right that they reek.

It is usually easy to tell when a regen cycle is happening - but the only smell even during a regen cycle is that of "extreme heat" (as in metal parts being so hot that you can smell whatever road debris may have accumulated on the underside of the DPF burning off). No unburnt or incompletely burnt diesel comes out of the tailpipe. All of my gasoline powered cars smell more than the ML BT. Yes, I've been outside when it is happening - as I said, the heat is very noticeable, but there is no diesel smell.

Quint22

VWs have dpf and scr (requires def) same as mb and every other modern diesel atleast in the US. Depending on year ofcourse. My truck had both as well. That being said i could not smell either my mb or my ram when either was regening.

Dont park a truck doing regen at idle by a hedge though, will make a big brown spot where the exhaust comes out. Dont ask lol

Diabolis

IIRC the 3 liter TDI engines did have a SCR but they were not running it 98% of the time. The 2 liter TDI engines did not have a SCR.

Yeah, the exhaust gas temperature during a DPF regen cycle is about 570 deg C / 1050 F. That will definitely burn bushes, melt plastic and set fire to whatever happens to be near the exhaust. Been there and done that.

00Coupe

2.0 Passat has DEF, as well as. 2015 Golf 2.0.

The 2012 Jetta did not have DEF.

Quint22

Yeah anything with DEF has a SCR. That is what the DEF is injected into. Not sure about not running it 98% of the time, never saw that stated anywhere and they still went thru DEF so had to be injecting it. Sure it went up some after the recall. Pretty sure it was more related to the tune the engine was running over the exhaust function but dont know all the facts.

The DPF was still working normally as ya cant do anything about that.

The fuel mileage went down after the recall so must be better lol.

Diabolis

The gist of the VW Dieselgate cheat / scandal was that the cars' ECUs were able to determine when the cars were being tested and activated their emissions controls only during laboratory emissions testing, which caused the vehicles' NOx output to meet various standards during regulatory testing. The vehicles emitted 40 times more NOx during actual real-world driving.

Quint22

Jetta 15-35 times and passat 5-20 times according to wiki. Thats US emissions limits which are the most stringent nox wise.

Tdott

Did my update Mid-Dec, got it back Jan 3.

I had a code for fuel pressure sensor, that wasn't on the list of parts changed, but it's common to bang the turbo charger on it when removing it and damage the sensor.

But I didn't want to deal with the dealer again or argue that they damaged it, so I ordered a sensor from amazon for $45 next day delivery and fixed it myself. So far so good. Haven't driven it enough to tell if anything else is effected but the CEL didn't come back.

kajtek1

Get under the car and see what is happening there.
Each of 4 AEMs I had done require some fixing.
Form sensors only finger-tight, to wires run against sharp edges of heat shields to shipping stickers still left on DPF, what is fire hazard.

Diabolis

We're completely off topic here, but this is what Wikipedia says about Dieselgate and what I quoted earlier:

"The agency had found that Volkswagen had intentionally programmed turbocharged direct injection (TDI) diesel engines to activate their emissions controls only during laboratory emissions testing, which caused the vehicles' NOx output to meet US standards during regulatory testing. However, the vehicles emitted up to 40 times more NOx in real-world driving.[27] Volkswagen deployed this software in about 11 million cars worldwide, including 500,000 in the United States, in model years 2009 through 2015.[28][29][30][31]"

Sorry for the thread hijack everyone... back to regular programming.

Quint22

But the researchers found that under real-world driving conditions the Jetta exceeded US emissions limits "by a factor of 15 to 35" while the Passat exceeded the limit "by a factor of 5 to 20".[90][92]

https://en.wikipedia.org/wiki/Volksw...ssions_scandal

Anyhow back to regular programming....

snow501

Got mine done since 4 weeks now on 2011 R350, now engine stalls immediatly when putted in grear, must let engine run on idle for 1 or 2 minutes before putting in gear, never had this problem before, dealer said after many tests with mercedes tech line that it's my torque converter, but why it is comming suddenly after the field measure. once the engine is warm the car runs great the whole day, any one experienced this issue ??

91stealthes

So the issue arose 4-weeks after getting the AEM performed on your 12-year old vehicle, which probably has over 120k, and you are trying to link it to the AEM? I had an issue with my Torque Converter around 70 or 80k miles, so not out of the ordinary. I believe others have as well. I believe this is just a coincidence. Now, if it happened within the 1st week of the AEM, then there may be some affiliation, but still doubtful.

The fact that it doesn't do this when warm has me scratching my head and you'll need to wait for the more tech savvy members to jump in.

snow501

no, the issue appeared right away after the dealer finished the work, they called me to take the car, when i started it in the dealer parking it stalled when putted in gear, this is why in linked directly to the AEM, the called their technician , he tried two times, engine stalls, third try he let it run on idle for one minute and the back to the workshop, car stayed there anbother week, they found nothing and told that it was a coincidance and my tork inverter needs to be replaced , wich i dont really agree with, car run perfectly if let it on idle one minute before driving.

snow501

no, the issue appeared right away after the dealer finished the work, they called me to take the car, when i started it in the dealer parking it stalled when putted in gear, this is why in linked directly to the AEM, the called their technician , he tried two times, engine stalls, third try he let it run on idle for one minute and the back to the workshop, car stayed there anbother week, they found nothing and told that it was a coincidance and my tork inverter needs to be replaced , wich i dont really agree with, car run perfectly if let it on idle one minute before driving.

kajtek1

Did they give you printout of live data showing converter stall?

Diabolis

If your torque converter has to be replaced, that has nothing to do with the AEM.

Warning RedFlag

✅

Tdott

Shops hate these older vehicle owners who try to blame every little thing on them. Some won't even touch older cars because it's not worth the hassle.

00Coupe

Ever since.....😀

Ive noticed two change points after doing AEM.

1. my engine idle is different when cold, same when warmed up
2. More power at low end

All in all very positive improvement

Diabolis

Agree 110%. People don't seem to realize that for the past ~15 years cars have been built to fall apart on purpose after 8-10 years (i.e. become financially unfeasible to keep on the road). They are purposefully built not to last. If a car only lasts for 8 years instead of 20+, the manufacturer sells two and a half times as many cars. They are reliable during the warranty period when the original owners drive them, and they still have another 4 or 5 years left and can be resold as CPOs when they are first traded in. The second owners can get them for half the price of what they cost new, but can only use them for another 4-5 years before everything stars to go and the car is no longer financially feasible to service.