Questions tagged [exhaust]

Questions about Exhaust systems, Catalytic Converters and Headers/Manifolds

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Does anyone the location of the serial numbers for 2004 CARB Subaru Outback Catalytic Converters?

I replaced most of my exhaust system a few years ago (catalytic converters and O2 Sensors) because of a P0420 error. My car came from a state that required the vehicles to meet strict emissions ...
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38 views

Why do Tri-Y Headers give more low end torque and struggle at top and why 4-1 Headers give better top end torque?

Everywhere i read says Tri-Y is better for bottom end and that the 4-1 is better for top end. Why exactly is that? I thought Tri-Y would have more top end "breathing" and make more torque at ...
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exhaust leak 2002 honda CRV

I have an exhaust leak where the flange / clamps connecting the catalytic converter to the exhaust pipe / resonator assembly. As you can see from the picture it's very corroded. I was hoping for ...
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43 views

2'' exhaust lap joint, size difference

I want to connect a middle muffler to the rest of the exhaust with a lap joint using a clamp. I measured and the OD of the muffler is 50 mm. The ID of the other part is 53,5 mm. Is this difference in ...
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3k views

How should I remove this corroded nut without rounding it?

I have a 1982 Porsche 911 and need to remove the heat exchanger on one side. It's held on with three 13mm nuts and 3 barrel nuts. The barrel nuts were no problem, but two of the 13mm nuts are so ...
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1answer
48 views

Odourless, invisible fumes in cabin

I have a deisel 2012 Volvo C30. Previously, I could smell fumes coming into the cabin and I got it fixed. I cannot smell anything but I am still concerned I might be getting fumes inside because if I ...
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2answers
69 views

I had my exhaust replaced and my engine started humming then seized

a while ago I decided to fix my whole exhaust from the headers to the tailpipes. After looking I spent around 2 grand on parts alone ( I made sure they fit) originally I was gonna replace the exhaust ...
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38 views

Painting a Front Catalytic Converter — Bad Idea or Not?

I need to replace the front catalytic converter on my 2006 Suzuki Aerio. The part came in bare metal, no paint or any coating is visible or possible to feel on the surface. Should I not paint it to ...
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1answer
57 views

Replaced my 5 cylinder Volvo V70 2.5l turbo engine with a 6 cylinder S80 2.9l twin turbo engine and I'm having trouble with the exhaust

Replaced my 5 cylinder Volvo V70 2.5l turbo engine with a 6 cylinder S80 2.9l twin turbo engine and I'm having trouble with what to do about the exhaust. The original 5 cylinder had only 1 turbo, 1 ...
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1answer
36 views

ECU tuning exhaust - why?

When a sports exhaust is fitted to a car apparently a re-tune of the ECU is required. For a simple example consider a regular unmodified normally aspirated petrol car which then has a sports exhaust ...
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1answer
59 views

Is my exhaust causing misfire or did misfire burn the exhaust?

I hope to not be too vague as I don't know a lot about cars. I recently purchased a 1.2L Fiat Punto II 2005. It has trouble with a rough idle, a power drop off around 4krpm when accelerating and a ...
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48 views

Can exhaust backpressure cause a car to cut out?

Car cuts out sometimes immediately sometimes after 30 seconds etc. If I hold the key on the starter position engine keeps running and stays on. I know this can be caused by a faulty ignition switch. ...
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1answer
60 views

what should I replace resonator with?

Civic coupe vti 99. resonator keeps Getting hit by road humps as car is low. I want to stop this. Entire exhaust does not need to be changed as pipe diameter doesn’t hit but resonator only does. I ...
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1answer
53 views

Can damaged sports exhaust lead to reduction in sound factor?

Assume you have a sports exhaust which sounds awesome but suddenly starts to quiter or less awesome. there are no air intake, engine or exhaust leak problems. Could any other factors cause it to ...
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44 views

Exhaust vibrations/noise

I have had for some time some exhaust noise/vibrations, and decided to buy a new exhaust. However when I checked the exhaust I couldn't find any holes or any bad rubber holders. I decided to not ...
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60 views

Do I need to replace my catalytic converter or it could be exhaust leak?

I have WV Polo 1.2 petrol from late 2005 with 170k. Recently I got the check engine light and I went to non official repair service (since there isn't one in my country). They told me it's the oxygen ...
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57 views

Peugeot 206 2003 engine overheating STOP light

I bought my 2003 Peugeot 206 second hand from a private car dealer about 4 months ago and everything seemed ok, except for the exhaust pipe appearing to be tied with plastic zip locks. About a month ...
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39 views

Can exhaust system hangers make a car sound significantly different?

Civic coupe vti 1999. I previously had an accident after where my low suspension car fell to the ground at low speed when a wheel nut cane off. After this the car didn’t sound as vibrant and peppy as ...
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1answer
335 views

Emission High CO and High Lambda

It fails at 2500rpm only with CO 0.5~0.6 and Lambda 1.04~1.05. How can it possible be that emission fails because of HIGH CO, and HIGH lambda reading... It means that engine runs rich and lean at the ...
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31 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
73 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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28 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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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
55 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
274 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
25 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
28 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
56 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
124 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
190 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
196 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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3answers
344 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
85 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
122 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 thoroughly cleaned, ceramic coating, powder coating, or heat resistant paint to ...
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106 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
129 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
145 views

What socket fits the Catalytic-converter-to-Exhaust-manifold 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
722 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
4k 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
29 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
56 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
867 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
170 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
94 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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318 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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59 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
46 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
94 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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