Questions tagged [exhaust]

Questions about Exhaust systems, Catalytic Converters and Headers/Manifolds

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Muffler pipe name? + How to replace/fix?

A typical muffler has at least 2 pipes coming in/out of it: 1 that carries exhaust into the muffler and 1 that carries exhaust out (i.e., the "tail pipe"). Does the pipe leading into the ...
theforestecologist's user avatar
2 votes
0 answers
60 views

Downstream O2 sensor shows lean but LTFT is negative

I have a 2011 Chevy Traverse with a P2099 CEL that I can't get to go away. I used an OBD scanner to watch the live O2 and fuel trim data. The downstream O2 sensor on bank 2 (side that P2099 refers to) ...
Mr. Spock's user avatar
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1 answer
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Why are some specific makes of car particularly vulnerable to catalytic converter theft?

The Guardian is reporting that catalytic converter theft is an increasing problem, with knock on effects on insurance. The particular example is of LV= which says of a discontinued insurance policy: ...
User65535's user avatar
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Smoke from tailpipe when pulling away from idle

The vehicle is a 2003 montero sport with the 6g72 3.0l petrol engine. I have a strange issue where there is white/ greyish smoke from the tailpipe after I pull away hard from an idle about 5 minutes. ...
Hasitha Shan's user avatar
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28 views

Is it possible to test an exhaust system for a restriction without dismantling it?

I've had an overheating problem with a new/other engine (1991) for 3 years now. Some time back I discovered that there was a misfire on cylinder 1 and maybe an intermittent misfire on cylinder 4. I've ...
Michael Sherpa's user avatar
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57 views

Is a snorkel sufficient to ford big puddles?

Hypothetically - if the extreme rains and weather continues, would fitting a snorkel be sufficient to allow my ICE car to ford deeper water (assuming that the road is intact of course). I am ...
JoSSte's user avatar
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Water spraying from tailpipe?

i have a 2010 honda fit. the other day i was on my lunch break sitting in my car with it running. which i do all the time. about 30 minutes later i hear some sound from the back of my car and i see ...
ahuckstep 's user avatar
1 vote
1 answer
452 views

Putty for exhaust manifold leak

Having some issues with a small exhaust leak from the exhaust manifold on my campervan. We got it taken to a mechanic to repair the manifold leak but he's ended up just making it worse. I dont have ...
Bren's user avatar
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1 answer
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Will fixing first OBD2 misfire codes resolve the cascade of others downstream?

Looking at a car my kid wants to buy. 2012 Honda Civic LX. One owner, some service records, seemed to run fine in test drive. No colored exhaust gasses, no dashboard lights, sped on freeway, sudden ...
Stay-at-home-dad's user avatar
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My Corsa makes a strange noise after 10mins of driving, any suggestions for the cause?

So my 2007 Corsa Sxi 1.6L started making this noise after an audible 'Ping' happened while driving (at low speed, had just started my journey). It has been inspected by my local garage but they ...
Tomato Potato's user avatar
1 vote
2 answers
2k views

How does CO poisoning still happen with newer cars?

I'm learning about catalytic converters, and learned that a car with a functioning converter doesn't output carbon monoxide (CO) because it converts it into carbon dioxide (CO2) and water (H2O). How ...
M -'s user avatar
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2 votes
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06 Accord Stolen Cat Causes Worse MPGs?

my catalytic converter was stolen. Because of this, my car now smells like gas and gets worse MPGs. I do city driving and now after a mechanic straight piped the car, I get about 23 MPGs as opposed to ...
Mo Akashi's user avatar
1 vote
1 answer
74 views

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 ...
MegaMark's user avatar
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1 vote
2 answers
137 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 ...
Samo23's user avatar
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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 ...
Stay-at-home-dad's user avatar
1 vote
1 answer
45 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 ...
ishmandoo's user avatar
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1 answer
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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 ...
amphibient's user avatar
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2 votes
1 answer
41 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 ...
T. Hardy's user avatar
1 vote
2 answers
83 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?
Ali Choudhary's user avatar
2 votes
2 answers
2k 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 ...
hotmeatballsoup's user avatar
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2 answers
2k 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 ...
user71526's user avatar
1 vote
1 answer
134 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 ...
Edv Beq's user avatar
  • 113
2 votes
2 answers
4k 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 ...
user3080392's user avatar
1 vote
0 answers
1k 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 ...
Luke Wilson's user avatar
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 ...
User65535's user avatar
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0 votes
1 answer
35 views

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 ...
SuperSafari's user avatar
0 votes
1 answer
341 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, ...
user875234's user avatar
0 votes
0 answers
157 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 ...
user67563's user avatar
1 vote
1 answer
81 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??
Wanda's user avatar
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0 answers
142 views

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 ...
krtzer's user avatar
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112 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 ...
Timothy Scherer's user avatar
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 ...
Edward's user avatar
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0 votes
1 answer
111 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 ...
Mr_Thyroid's user avatar
0 votes
2 answers
94 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 ...
DJustice's user avatar
0 votes
0 answers
95 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 ...
Igor Soloydenko's user avatar
3 votes
1 answer
264 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 ...
Adam Dahlvang's user avatar
0 votes
1 answer
167 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 ...
ajayel's user avatar
  • 474
0 votes
1 answer
370 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 ...
Jordan Fagan's user avatar
-1 votes
1 answer
178 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. ...
James Wilson's user avatar
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0 votes
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 ...
James Wilson's user avatar
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0 votes
1 answer
100 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 ...
James Wilson's user avatar
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0 votes
0 answers
57 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 ...
JTIM's user avatar
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1 vote
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239 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 ...
lowselfesteemsucks's user avatar
0 votes
0 answers
276 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 ...
James Wilson's user avatar
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1 vote
1 answer
3k 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 ...
John's user avatar
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0 votes
0 answers
40 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 ...
Ardalan G.'s user avatar
2 votes
1 answer
583 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 ...
James D's user avatar
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0 votes
0 answers
310 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 ...
Laine's user avatar
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1 vote
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339 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 ...
James Doyle's user avatar
1 vote
1 answer
63 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 ...
Kimgamez's user avatar

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