Questions about Exhaust systems, Catalytic Converters and Headers/Manifolds
9
votes
2answers
2k views
When car is standing still, I smell Diesel exhaust. Why?
In my 2003 Opel Vectra, the cabin air smells of Diesel exhaust while stopped at e.g. a red light.
The exhaust smell goes away when driving, and it also doesn't come back if I turn the ventilation off ...
6
votes
1answer
1k views
What are the tell tale signs of a catalytic converter that might be going bad?
I've owned two vehicles whose catalytic converters were recalled due two a couple of reasons: one being the quality of the CC and the other being a reduction in power due to a material building up and ...
2
votes
1answer
109 views
How should I diagnose an exhaust “howl” when descending through 3200 rpms?
As mentioned previously, I have a 2004 WRX wagon with a stainless Prodrive circular-tip axle back installed around 2006. Lately, the weather has been nice enough to drive with the windows open and ...
1
vote
1answer
265 views
What could be causing a distinct exhaust drone in a tight band around 3250 rpms on a 2004 Subaru WRX?
EDIT: Additional information provided by LovelyWife(TM) - listening outside the car, she has proclaimed that the rattle / buzz / drone / resonance is coming from the front of the car and sounds like ...
