Questions tagged [exhaust]

Questions about Exhaust systems, Catalytic Converters and Headers/Manifolds

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What are the consequences for having a mismatched inner diameter for an exhaust system

I’m installing my new exhaust system including Headers 60mm inner diameter at exit, down pipe 60mm inner diameter throughout, front pipe 80mm, and cat back 60mm My question is… I’m I going to regret ...
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1 vote
2 answers
33 views

Exhaust rusting

I just purchased a 2023 nissan frontier pro 4x new back in the end of December. I live in the northeast, so I know rust will happen on the exhaust and muffler quickly. This just seems a bit excessive ...
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10 votes
5 answers
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Is an exhaust pipe broken at engine connection fixable by a DIYer?

I took my 1999 GMC Sierra 1500 w/5.3l to a transmission shop to have it replaced. The process requires disconnecting the exhaust pipes going into the engine to get access to the transmission. When the ...
1 vote
1 answer
36 views

Leaks along exhaust system?

My car recently failed its inspection in Massachusetts. The mechanic told me that there are small leaks all along the exhaust system. They want to do something called a cat back replacement from the ...
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0 votes
1 answer
53 views

Chimneysweeping exhaust pipe for performance

Hypothetically, I was wondering if chimneysweeping exhaust pipe, if I have easy access to entry points, as in maybe the catalytic converter manifold taken out, would improve the engine performance as ...
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2 votes
1 answer
38 views

Wires from exhaust

Driving down the road today and i hear a snap, then lost all acceleration, these four wires wrapped in a casing were ripped out after wrapping around the axel, they are attached to part of the exhaust ...
1 vote
1 answer
39 views

P0420 In Honda Civic or any other car

Just want to know about P0420 code in any car and specially in Honda. Does that mean only that catalytic convertor is bad or any other reason too?
2 votes
2 answers
586 views

Chevy Silverado muffler and/or exhaust is rattling

2018 Silverado here. Over the winter I noticed a prominent rattling coming from somewhere underneath the vehicle that was made worse whenever I am stopped but in drive. For example, its the absolute ...
0 votes
2 answers
455 views

Run car with exhaust hole without O2 sensor?

I tried starting my car yesterday but it struggled to start and ran really rough like it was struggling to get any fuel. It's not a fuel problem cause I could smell the rich mixture been output from ...
1 vote
1 answer
65 views

1990 Suburban exhaust system replacement

I recently purchased a 1990 Suburban - and it has a Chevy 350. The exhaust merges and exits on the left side. I am unable to locate a replacement which is a direct fit. Also, almost all y-pipes online ...
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2 votes
2 answers
256 views

Why is my exhaust leaking antifreeze?

I have a 2001 Honda Accord and I just noticed what appears to be antifreeze dripping from a part of the exhaust system. I did not see any leaks around the radiator. I'm not even really sure what the ...
1 vote
0 answers
199 views

Car exhaust spraying water (Honda Fit)

I have a question which isn't quite answered in any of the previous posts I looked through on water and exhausts. I went to look at a 2011 Honda Jazz/Fit today as a possible used car purchase. I was ...
13 votes
7 answers
6k views

Why have I had to replace so many exhaust pipes?

My largest car maintenance cost is exhaust pipes, mostly catalytic converters. I do not think this is the case for most people. What am I doing wrong? I tend to buy cheap cars (<£500), change the ...
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1 answer
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ECU shielding/ Highway driving

Ok, two qs I was wondering about (completely unrelated): How are ECUs and electronics shielded from all the heat that a car generates, especially when the car is driven in hotter climates (i.e Middle ...
0 votes
1 answer
150 views

would you use a cheap 70 amp stick welder for an exhaust pipe?

I've never welded before but how hard can it be right. You cut the old pipe out, go down to AutoZone and get yourself a new pipe and some adapters, tac it in place and then weld it all together. Easy, ...
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0 answers
87 views

Car exhaust smoking (white smoke) a lot when driving

I have a bmw e60 with low mileage, I had an overdue service that I got done at garage, they advised that I have sludge/soot in the oil judging by inspection of oil filter.as I drove it home alot of ...
1 vote
1 answer
58 views

A/C dripping water onto exhaust

I have a Chevelle 1970 w/ 427 The A/C drips water onto exhaust pipes up close to the engine. Will that harm pipes when Hot??
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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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0 answers
58 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 ...
10 votes
8 answers
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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0 votes
1 answer
70 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 ...
0 votes
2 answers
92 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 ...
0 votes
0 answers
77 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 ...
3 votes
1 answer
185 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 ...
0 votes
1 answer
137 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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1 answer
119 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 ...
-1 votes
1 answer
76 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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1 answer
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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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0 votes
1 answer
86 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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0 votes
0 answers
50 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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1 vote
0 answers
149 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 ...
0 votes
0 answers
99 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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1 vote
1 answer
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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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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 ...
2 votes
1 answer
292 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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0 votes
0 answers
115 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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1 vote
0 answers
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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 ...
1 vote
1 answer
61 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 ...
2 votes
1 answer
1k 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)&...
1 vote
1 answer
45 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 ...
1 vote
1 answer
69 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 ...
1 vote
1 answer
167 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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2 votes
2 answers
1k 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 ...
1 vote
2 answers
1k 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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4 answers
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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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3 votes
3 answers
1k 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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0 votes
1 answer
396 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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1 vote
1 answer
233 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 ...
2 votes
0 answers
302 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 ...
2 votes
2 answers
215 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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