Questions tagged [exhaust]

Questions about Exhaust systems, Catalytic Converters and Headers/Manifolds

54 questions with no upvoted or accepted answers
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Mercedes veto Exhaust

Just got a new exhaust fitted, the part that goes from the front wheel area all the way to the back. And NOW there is a smell of exhaust fumes in the veacle, that seams to be coming from the vents. ...
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33 views

2000 Camaro headers/Borla

Just bought 2000 Camaro stock and looking to add headers and Borla exhaust. Thinking BBK long tube headers and a Borla exhaust. Has anyone done that? Any recommendations? Any other suggestions ...
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150 views

Decreased MPG, clicking sound when pressing accelerator

Over the past week, the MPG on my car has gone down significantly, about 3-4 MPG. My driving habits have not changed. In the meantime, there is a distinct "pneumatic" clicking sound whenever I press ...
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454 views

Oddball Cat and Exhaust Manifold 04 Nissan Xterra

I recently got the p0420 code and narrowed the issue down to needing a new cat. Thought i'd be smart and went to Walker identify the exhaust for a basic '04 Nissan Xterra XE, 4WD, 3.3L. Found the ...
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101 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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153 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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44 views

California CARB converter list by the CA Air Resource Board is no longer available

The only CARB listed converters by California is AP Exhaust 749233 Direct Fit and 740566 single replacement are no longer available. I called AP Exhaust and they are closed down and not sure if they ...
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30 views

97 Yukon 5.7 Backfired with smoke inside the car, now idles really badly

I have 1997 GMC Yukon. 5.7 litre. I started it this morning and it sounded like a gunshot. Smoke came into the vehicle and the PCV valve and one other sensor that plugs into the valve cover(s) were ...
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92 views

1983 22R Randomly started sounding like a chopped harley

5 second videos, this is what it sounded like: Yesterday: http://youtu.be/_2Nl0bR1QOA and Today: http://youtu.be/zP4_cT8yaH4 It sounds like this regardless of engine temp Started randomly It's ...
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110 views

Fixed exhaust leak, running hotter now

Yeah, it's the Solstice again. I just replaced a v-band clamp between my turbo and the cat. The engine runs a lot smoother now - go figure - but it's running quite a bit warmer. Before I recently ...
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1answer
3k views

Why do some cars fart?

Sometimes, I'll hear Mustangs and Honda Civics "farting" and making loud noises. What is the cause of this and why doesn't my car do it?
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59 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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1answer
260 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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44 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
53 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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114 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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75 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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353 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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1answer
52 views

2014 HARLEY ULTRA EXHAUST UPGRADES

I'm helping a buddy. He has a 2014 Harley Ultra Classic with a high output 103. It has 23k miles, Vance & Hines Short Slashes, Vance & Hines Heavy Sucker air filter, and Vance & Hines Fuel ...
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33 views

Can Super Charger performance gains be limited by a stock exhaust?

Edit: As suggested by Rory Alsop in the comments, I believe this question is not a duplicate of: Performance Exhaust -- what, how, why? & Exhaust Backpressure and Its Impact on LTFT Values I ...
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325 views

Cold weather idling issue, white smoke, black soot and loss in power

I have a 1976 cj7. I recieved it as a gift from my Dad in March this year. I absolutely love this Jeep and have been driving it as often as possible. It had a really bad idle and severe exhaust/fuel ...
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2answers
89 views

dashboard light to replace catalytic converter, later engine loud dash light disappears

A engine checklght appeared on my 2004 Hyundai Elantra GT hatchback, and was diagnosed as a faulty catalytic converter, that was considered normal for the age of the car. About 3 days later when i ...
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163 views

Black soot on exhaust manifold 2015 Ford KA 1.2

Is this normal or does it need replacing?
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1answer
284 views

What could be causing High HC GPM, CO GPM, prevent the RPM from going over 4000, and creating an odd exhaust sound?

I have a Toyota Camry 94, it failed its emission test today with 2.62 HC GPM(Limit is 1.2) , 56.87 CO GPM (Limit is 15). The car also won't rev over 4000 RPM and acts as if it has a governor on when ...
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321 views

How can I locate the source of this exhaust rattle?

'04 Infiniti G35. Recording of sound I'm hearing. The best example is at 0:39 onward. Heard best with headphones. Firstly: I'm aware I have an exhaust leak. That part, I can hear all the time, ...
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25 views

1996 Infiniti g20 fails smog

I am the original owner of this CA car, and have been gradually having higher HC readings on smog checks. It failed in 2016, cleaned out the Air flow components; it passsed, but this increased the NO ...
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48 views

Pipe has come out of the silencer?

I hit a pothole this morning on my way to work. I couldn't swerve it so slowed right down but it still sounded painful! Afterwards the car was making a boy racer type noise, so took it to the garage ...
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80 views

Still having blue smoke

I have no idea in car engines. My car is having a blue smoke in the exhaust. The car mechanic suggest to change the piston rings and valve seals. After he replaced it I still get this blue smoke when ...
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38 views

Strange sound at end of rev range when push throttle when parked.

I was just wondering what your thoughts are on this sound I’m experiencing with my Jeep? I have a Jeep Commander 5.7 Hemi 2006 with a Magnaflow 49709 cat (newly installed) and a magnaflow 18″ oval ...
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2k views

New car - a lot of smoke from exhaust

I got my new car today from the dealership, and while driving home I noticed there is quite a bit of smoke coming of the exhaust, to the point of blocking my rear window visibility. Only happens when ...
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144 views

Exhaust system pipe welding

Hi everyone I have an exhaust for a motorcycle which I have to modify. The trouble is pipe which connects to the end can is of a different diameter to the bit it's supposed to connect to on the ...
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341 views

Motorcycle exhaust can size

How does the length of the exhaust 'can' affect the noise level and engine response of a motorcycle. A number of articles mention how the pipework diameter affects response but I can't find much on ...
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38 views

2005 Ford Explorer Sport Trac Exhaust System

Would I be able to fit a Spintech Pro Street 9000 series onto my 2005 Ford Explorer Sport Trac? And if so, what else would I need besides the muffler itself?
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38 views

Nil HydroCarbon in the exaust

If hydrocarbons (HC) are nil and Carbon Monoxide (CO) is 0.33% and Carbon Dioxide (CO2) is 14% Why does the HC show up as nil? Is there a problem with having no HC readings?
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1answer
2k views

White exhaust and smell when accelerating

I just noticed my 92 Grand Am is spitting out a lot of white exhaust and has a gas smell to it. I made it home but engine started sputtering and seemed like car was going into cardiac arrest. Haven't ...
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1answer
24 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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40 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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37 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
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
40 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
52 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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47 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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38 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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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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26 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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311 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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230 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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1answer
27 views

Exhaust 98 Ford Expedition

I need a complete exhaust system. Someone gave me 1. Not sure that it will fit my truck. How can I find out? It also includes a catylic converter. Mine currently has a hole in it. How do I find out if ...
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87 views

Trouble identifying source of exhaust note change

I am completely inexperienced when it comes to hands on mechanics, though I do understand in a theoretical way how things generally work. I have an Acura Integra 1997 LS that has been gradually ...