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Changed filters, cleaned MAF sensor and most importantly I changed all four oxygen sensors last Saturday. I've only driven the car about two miles due to snow still on the ground, but the car still smells like exhaust, and it's running rich ......and it's all over my clothes etc.
Could it be the fuel regulator? The car is running actually awesome especially Since I changed the sensors but I can't even drive it because my clothes will smell.
Any thoughts or suggestions would be appreciated. I was thinking maybe the sensors need to be run for awhile for it to clean and recalibrate with the ecu but I'm not a mechanic so I have no clue.
One more thing I noticed the cats have been replaced with straight pipes...could that be a cause of the smell? It's coming from the pipes, not inside the car.
have you checked for exhaust leaks?
you do know that the fumes are toxic and lethal.
i wouldn't sit in a car if fumes enters cabin!
have you noticed having headaches or feeling ill?
you slowly getting poisoned
PO must have messed with the exhaust pipes, maybe clamps are not tighten or old pipes having rust holes?
there is exhaust paste to apply on pipes to seal for possible leaks where the one pipe goes into the other pipe, then let car sit on idle revving it for a while for paste to harden
Last edited by KJI3jflarryfe93; Mar 8, 2017 at 07:31 AM.
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
I would check for exhaust leaks and as Kowalski says perhaps the clamps are not tight enough. I would recommend getting some good quality SS clamps like this type: http://www.mikalor.com/eng/super-heavy-duty-clamp-eng
and not the U shaped ones most people go for.
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Originally Posted by peppyhead
One more thing I noticed the cats have been replaced with straight pipes...could that be a cause of the smell? It's coming from the pipes, not inside the car.
Just the two rear cats removed and replaced with straight pipes.
there is no cabin smell whatsoever. I can't really drive it because of snow on the ground but if I start it in my garage and let it idle (thinking it will clear the smell out with the new sensors, etc) your clothes smell like exhaust.
When I replaced the sensors the car idles and runs way better and it was a noticeable difference.
I've tried to search but can't find anything really in this forum. Like I said I don't think it's a big deal, something small but there are no exhaust leaks under the car either....
Removing my secondary cats definitely made my exhaust stink but not that bad. I can't idle in the garage either, bit neither could I before, as the wind pushed exhaust fumes back inside and it would make my eyes burn
It's not that I'm smelling just gas, it's kind of a mixture, like the car is carburated or something. I am certain it's the lack of the secondary cats. I guess I can go to my independant mechanic and get them to hook it up to their machines and see.
Nothing seems wrong with the car from a running standpoint. Idles perfect, starts perfect, sounds perfect, and drives great.
Wondering if I put the secondary cats back on if that would make a difference?
Also guys, this might be a dumb question but is the resonators the two devices that look kinda oval/roundish and fat right off the manifolds?
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
If the cats were broken or had a default, you would certainly have an error code.
I still think the problem is that the engine and exhausts are not getting up to ideal operating temperatures. If I started mine now after 2 months hibernation and didn't get out of the garage, the smell would be overpowering.
Until you get the car running on the streets or better still on the highway and reaching ideal operating temperatures, you will always have the smell.
Your 43 is fine IMHO
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
I forgot to mention in my previous post that if I stop the engine and start again after 15-20 minutes, the smell of unburned gas will be present for a couple of seconds. The cats need to get up to high temps to "purify" the exhaust gas.
If you get the smell of rotten eggs from the exhaust, you have a cat problem.
I dont think the car should smell like gas or exhaust fumes at all
Its just not right. Ive been in many MBs and no car has smelled like gas. The exhaust will smell if its running rich or what not but I only had the smell of gas when my fuel pump hose had a tiny leak by the back axle
PJ, not gas, just a strong exhaust odor that probably has gas, oil, etc mixed in there.
Anyway I just got it towed to my mechanic, funny the tow truck driver didn't put the dollys on it right away and cracked my whole front lower bumper and damaged everything. Literally happened 1hour ago. Here is a pic. Good thing is that they are paying for everything and were extremely apologetic, and it was already a bit rough with rock chips etc so now it will be brand new with shiny paint!!! (Here is a pic)
Also we put it up on the hoist and my mechanic without hooking it up yet suspects it could be the pcv valve (Positive Crankcase Ventilation), but will confirm when he's sure.
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