Questions tagged [exhaust]

Questions about Exhaust systems, Catalytic Converters and Headers/Manifolds

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23 views

Long term engine issues by using Active Exhaust?

Looking to install OEM active valve mufflers on my 2019 Mustang EcoBoost. Wondering if the valves opening and closing, thus changing exhaust back-pressure would cause the engine to run lean/rich and ...
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1answer
37 views

Car consuming oil, leaving soot on ground

I have a 2010 Hyundai i30cw. It's the FD, 2.0L Petrol Engine variant, Automatic Transmission. Around five or six months ago I took it to the dealer for a service - they didn't call out any issues, but ...
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18 views

How to design an exhaust pipe to increase scavenging at specific RPMs

Good day all. I'm looking for advice on an exhaust design problem. It is easy to find videos explaining exhaust scavenging, but how do you control it? Surely there must be some physics that can be ...
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36 views

Just changed catalytic converter and getting P0171 and P0430 codes

Vehicle is a 2004 Mercury Monterey, V6. Over the winter the injectors were replaced, and all 4 O2 sensors. It failed a state inspection, because the catalytic converter had been damaged, presumably ...
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1answer
52 views

Will replacing spark plugs fix this? [closed]

My husband and I purchased a 2011 Mazda 6 2-3 months ago. It had 71,000 mi on it when purchased. One accident, but only cosmetic. A few weeks after driving it, I noticed some jerking when coming from ...
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1answer
49 views

2007 Honda Fit Sport P0420

I backed up in a dirt lot and heard a metal scraping sound. After driving about 30 miles, the check-engine light came on with code P0420 indicating "Catalyst Efficiency Below Threshold (Bank 1)&...
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1answer
21 views

2014 Passat sounds louder than before

I have a 2014 VW Passat 2.5L I bought it used last year. It was super quiet and great to drive when i bought it. It has close to 80000 km on it. The past few months I had i sitting in the garage not ...
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1answer
20 views

Protecting the Mating Surface between the Catalytic Converter and Header

In the midst of replacing my Catalytic Converter on my 03 Nissan 350z, I have taken off the Catalytic Converter to reveal a pretty rusty mating surface between the two components. My question is what ...
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1answer
33 views

Black smoke coming from tail pipe?

I recently purchased a Honda CRF50 dirt bike for my kids. When applying the throttle black smoke that smells like gasoline comes out of the tailpipe. From what I understand this means that there is ...
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2answers
26 views

What is the standard size thread for O2 (lambda) sensors?

I may be purchasing aftermarket headers for one of my projects. Most of the options I care to look at do not have O2 sensor bungs welded in them, so I'd have to purchase some and weld them in so the ...
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2answers
56 views

What is the cable connected to the base of the exhaust manifold

I'm currently taking apart an old vehicle which was just lying around. While dismantling the exhaust manifold, I noticed there was a cable that connects to its base, right before the point where it ...
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4answers
66 views

Is it ok to remove flanges from exhaust pipes?

The flange connections on my exhaust pieces are rusted out and leaking. One way I've considered addressing this is just cutting out the flanges and welding in a straight pipe to bridge the pieces. ...
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35 views

Can an x pipe be placed directly in front of the muffler?

Curious to know if there are any exhaust flow studies to see if a two in and single out muffler will work with an x pipe. If you were to place an x pipe 2" from the two port inlet exhaust would it be ...
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2answers
73 views

Diagnosing rattling noise whilst car under acceleration

I have a 2008MY Fiat Grande Punto (6 speed manual transmission), which has developed what I would describe as a rattling noise during acceleration. A few observations I have made: The noise sounds ...
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1answer
62 views

Check engine light, p0420 error and o2 sensor voltages

Good Evening, Some time ago I bought a used KIA ceed 2009. I've checked it with a mechanic who found it clean. The car was stationary for a long time and with little gasoline in the tank. I changed ...
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1answer
98 views

Cleaning Exhaust Manifold

I would like to clean up my rusty cast iron exhaust manifolds. What is the best coating to use after they have been throughly cleaned, ceramic coating, powder coating, or heat resistence paint to ...
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57 views

Are my cats bad? — secondary O2 sensor voltage

I have a 2002 BMW M3, and I've been trying to track down a poor fuel economy issue for quite some time now. My long term fuel trims are high (+7%-10%), and when I had the car on the dyno a couple ...
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2answers
84 views

How long does it take to trigger a CEL due to exhaust leaks?

tl;dr; If I have an exhaust leak that is sufficiently small such that upon the engine heating up the leak was reduced or removed to a satisfactory level to avoid seeing a Check Engine Light (CEL); how ...
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1answer
126 views

What is the name of the socket that fits this type of stud?

I'm trying to replace the exhaust manifold on my 2010 Chevrolet Equinox (2.4L 4-cylinder), and there are studs which connect the catalytic converter to the exhaust manifold. I cannot, for the life of ...
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1answer
62 views

Trying to explain plume of black smoke after a car sat in the garage for a few days

I drive Toyota Highlander 2005. It's a gasoline car. I filled up the tank a few days before this happened (right before Halloween.) It then sat in my garage for about 3 days. (I live in the WA sate ...
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1answer
323 views

Is it normal for decat car to smell bad?

civic vti 1999. Car has decat and smells bad and toxic. I’m a sensitive individual so probably worse for me than others. There are no bad smells like egg smells however when near exhaust it just ...
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3answers
3k views

What does exhaust smell on oil and transmission dipstick mean?

I was inspecting a used car and the oil and the transmission dipstick smelled of exhaust (carbon monoxide?). What does this mean? Does it mean that the engine's gone bad and I should stay away from ...
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1answer
26 views

Exhaust rebuild '03 Buell Firebolt XB9R

I am starting a project on my Buell and was thinking about using copper for the exhaust pipes. I think I'll like the patina, however I haven't seen copper exhaust pipes so ... On paper the copper ...
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1answer
44 views

Could I have a blown head gasket or something else?

My 2004 Ford Tarus all of a sudden overheated multiple times in one day. Then I noticed minimal white smoke and excessive water out of the tailpipe while at idle. The white smoke stopped but not the ...
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1answer
227 views

Water droplets from exhaust donut gasket?

Is this is a problem ? There's sometimes water droplets under the donut gasket on cold startup along with a brief smell of damp exhaust. The gasket, springs etc.. are OEM new & the mating ...
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0answers
48 views

2001 Camry P1135 Cause

Sorry in advance for the long post. My check engine light in my 2001 Camry 4cyl recently came on with code P1135. Google shows that this is usually a faulty sensor. However, I noticed on some posts ...
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2answers
92 views

Painting exhaust on motorcycle

I recently purchase an 07 Honda shadow spirit and it has chrome exhaust, could anyone tell me how I could paint them black, thank you
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197 views

White smoke from exhaust after brake job

I attempted (and failed) to replace my master cylinder and brake booster. I ended up putting a lot of brake fluid into my new booster before I realized it. (In fact, in an attempt to determine the ...
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1answer
30 views

What is difference whether the silencer has got one or two exhaust pipes?

My 1999 Opel Vectra B has got one exhaust pipe at the silencer. Now I have to exchange it and see models with one either two exhaust pipes. What's the difference?
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1answer
34 views

1994 Chevy 1500 loss of power slow acceleration what could this be

Chevy having slow acceleration when driving I was told it could be my catalytic converter could it be fixed by replacing with new exhaust system
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2answers
45 views

White exhaust fumes

On a hot/humid morning, my brand new 2019 Kia Sorento emits white smoke on startup. After driving for about 3 minutes it goes away. Is that normal?
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1answer
59 views

BMW i3 Range-Extended REx exhaust pipe? But where?

I have a similar puzzle regarding: the BMW i3 Range-Extended REx exhaust pipe, where is it? See also, https://www.mybmwi3.com/forum/viewtopic.php?t=197 BMW i3 is an electric car, so the exterior ...
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4answers
184 views

Why do worn diesels emit black smoke?

I have often noticed that on the road, whenever a heavy diesel accelerates, it emits a huge cloud of black smoke. If this happens in front of me, I put the air recirculation mode on. This typically ...
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3answers
467 views

Are these bolts welded on to my 2007 Ford Taurus catalytic converter

I've got a failed flex pipe on my Taurus, and I'm having some trouble removing it for repair. The flex pipe is part of the rear catalytic converter assembly, and it's held on by two bolts at the ...
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1answer
753 views

Loud humming noise from the back of the car when idle

Last year, after driving a long distance (about 200km), my 2013 Kia Cee'd started making a high pitch humming noise. It was loud when I was stopped but completely drown out by the engine noise as when ...
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1answer
36 views

Smoking from motorcycle exhaust, the crossbar?

I've been smelling a burning oil my motorcycle, a 81 Suzuki gs450l. If I sit long enough at a light it can smoke. I finally spend some time gave her a bath and proceeded to let run in neutral long ...
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114 views

Did muffler shop install wrong size flex pipe?

2003 Camry 2.4L. Noticeable vibration after the repair especially at idle with ac on and in reverse with foot on brake. They said bad motor mounts became noticeable after the repair. So I installed ...
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2answers
1k views

does straight piping your car remove catalytic converters?

I have a 2014 dodge charger hemi r/t. I'm looking to make it louder and i was just concerned about the cats being removed if I straight pipe it.
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69 views

Will an evap canister leak make the same noise as a cracked exhaust?

Video of driving recorded with iPhone SE(5). 2002 Honda Accord, parked outdoors New England, 214,000 miles Regular oil changes 1 owner before me, I got it around 150,000 great service records. Tran ...
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1answer
333 views

Difference between banks for AFR & O2 sensor values

This is a well maintained 2007 Subaru with 140k km on the 3.0 litre six cylinder EZ30R engine. She's running a little scratchy most noticeable when cruising although no codes or anything. I decided ...
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4answers
5k views

Is it possible for a vehicle to be manufactured without a catalytic converter?

Can a new vehicle from a plant be produced without a catalytic converter? Is it possible? I am a lecturer at a college in Zimbabwe, and my students recently asked this question, so I am researching.
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4answers
1k views

Is it possible for an oxygen sensor spacer to cause a car to stall?

VW CC 2010 2.0L CBFA I installed an O2 sensor spacer on my downstream O2 sensor and it seemed to be working for a day. One day later, after the car had cooled down it would rough idle and stall when i ...
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0answers
63 views

Where are the O2 Sensors in a VW with 3 sensors?

My VW CC 2010 2.0L Sport CBFA has three oxygen sensors and two catalytic converters. The CCTA version has 2 oxygen sensors and one catalytic converter. Since the engine is in a transverse 4 ...
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2answers
240 views

How many catalytic converters does a VW CC 2010 2.0L Sport have?

I have a P0420 code on my VW CC 2010 and I've narrowed it down to a faulty catalytic converter. I have edited this photo to try and explain easier. In the red circle is the catalytic converter I ...
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2answers
1k views

Thin white smoke after getting gas and fuel system cleaning

First time posting, have no car knowledge. We filled my wife's 2017 Dodge Durango up at a new gas station, shortly after that we noticed sluggish acceleration and trouble going off stops. We took it ...
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3answers
1k views

Sheared off exhasut pipe: How to fix without a welder?

The exhaust pipe on my 2005 Malibu has sheared off and is causing excessive noise. I would like to temporarily repair the pipe in order to reduce the noise that is being caused by the broken pipe. ...
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1answer
55 views

Is it unsafe to drive with a leak in exhaust box center silencer?

I have a 5mm in diameter hole/leak in my exhaust center silencer box. The part seem to be wearing with other tiny leaks developing. I plan to sell the car in 6 months at the latest. The center ...
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2answers
187 views

What is the best TurboCharger dump Pipe Length for a turbodiesel engine? [closed]

What is the best length for Turbocharger Dump Pipe. I have a Force Gurkha with a 2.6 litre diesel engine. I removed the second CAT Converter and Muffler from the exhaust. So now it has a CAT and then ...
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1answer
45 views

Is there a way to connect a 51mm silencer to a 23mm downpipe

I have a tgb r 125x can't find full sport exhaust or down pipe,wondering if it is possible to weld a 51mm slip on silencer if I cut silencer off one piece exhaust and reuse down pipe which is only ...
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0answers
207 views

Would a hole in the catalytic converter cause code p0420?

VW CC 2010. Catalytic converter was replaced when I first got the car at 78k miles. It is now at 83k miles. Downstream oxygen sensor was replaced at 80k miles. There is a small leak in the catalytic ...

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