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Questions tagged [exhaust]

Questions about Exhaust systems, Catalytic Converters and Headers/Manifolds

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Black soot on exhaust manifold 2015 Ford KA 1.2

Is this normal or does it need replacing?
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4 views

VW Golf MK4 BCB engine vibrations at ~1850 RPM

I have gotten exhaust front-pipe (1J0254300P), and catalyst changed in my VW Golf MK4 BCB engine. The used part was an aftermarket part from BM-Catalysts. Since then it has some vibrations between ...
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1answer
566 views

What is this piece, and is it important?

I recently started hearing a rattling noise coming from under my 2009 Kia Sedona. I jacked it up and found that a piece had completely rusted off and was just resting on top part of the exhaust ...
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2answers
64 views

How to remove broken bolt with screw extractor from exhaust manifold

Okay folks, so I have here an exhaust manifold from a 1989 Volvo 240. I was able to disconnect it from the downpipe without breaking all but a single bolt. I snapped about a quarter inch from the ...
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0answers
16 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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1answer
17 views

Intermittent p0420

I'm working on a customer's 03 Isuzu rodeo with the 3.2 6VD1 another shop had put new catalytic converters and O2 sensors on trying to troubleshoot a bad hesitation problem. I've since fixed the ...
2
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1answer
22 views

Most durable exhaust hanger?

I have a 2004 f150 and the exhaust hangers have rotted off except that last one at the very back (hook though rubber isolator). My exhaust pipe keeps twisting so that the tailpipe is against the ...
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1answer
27 views

Can I use a yoshimura exhaust in any bike?

I have an old Triumph motorcycle 955i that im customising. I want to change the exhaust and use a second hand yoshimura cheap one Is that possible? Or the exhaust needs to handle different pressure ...
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13 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 ...
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13 views

Squeeking sound back of car caused by exhaust?

My car keeps making a squeaking sound at back. There is an exhaust pipe which if you shake it makes noise. I'm wondering if its that the case, however i only notice the squeeking sound when going ...
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3answers
65 views

What is exhaust gas recirculation?

From what I understand, EGR is used to reduce the temperature of combustion without increasing the amount of fuel injected to reduce NOx emission. This is done by reducing the oxygen percentage ...
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1answer
75 views

Muffler fell off now has transmission issues

My 02 Dodge Caravan's muffler fell off sometime when I was heading to my girlfriends place. I didn't notice it till I got to her place because I listen to music loudly. Anyways I was driving it around ...
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1answer
48 views

Diagnosing a p0420 code for 2005 nissan x-trail 2.5L

I own a 2005 nissan xtrail with a 2.5L engine (QR25DE). I have problems with my vehicle, too much fuel consumption ( 3.8km/L ) My car has a 60Liter tank , my last fuel up gave me 229KM until the ...
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1answer
24 views

Is it unsafe to remove a heat shield?

My car (2007 Nissan Maxima) has a rattling heat shield. It has been rewelded once and is now rattling again. Would it be unsafe to remove it? Is it absolutely needed? What side effects may I have ...
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1answer
35 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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2answers
50 views

A liquid leaking

A liquid (almost sure it's water but I could always be wrong) is dripping out near and/or from my exhaust. I've also heard a weird almost draining kind of sound back there every time I turn the car ...
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2answers
27 views

Loud engine-related noises after impact to exhaust system: any recommendations to pursue?

1999 Toyota RAV4 took a big hit to the exhaust system (near the rear) yesterday on a logging road. Afterward, there was increased engine noise: I concluded immediately this was an exhaust leak induced ...
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0answers
42 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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0answers
17 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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1answer
33 views

My 96 s10 sounds like a jet engine

I have a Chevy S10('96) and when the vehicle is warmed up, it is very loud and doesn't accelerate fast from a stop. It's incredible how loud the engine gets and tries, but it doesn't calm down until ...
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0answers
128 views

Will dislodging carbon deposits harm the catalytic converter?

If I use an intake valve cleaner that dislodges chunks of carbon from the intake valves or piston head, and they flow through to the exhaust, could they harm the catalytic converter? I'm interested ...
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3answers
501 views

how long does fiberfix heat wrap last?

I've seen some videos on youtube for using this on exhaust leaks. Some prominent car repair youtubers seem to endorse this too. However some amazon reviews seem to say this wont even last beyond a ...
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2answers
506 views

Can an exhaust leak cause bad MPG?

One of the connections between the exhaust downpipe and DPF filter is leaking (I guess the gasket may be the problem). Recently the leak got a little bit more obvious, I can hear it when reving the ...
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2answers
53 views

Is there any scenario where it is benificial to restrict the airflow of your tailpipe?

Preface: There’s a story of someone who had been instructed to stuff a rag into their tailpipe either fully blocking or partially blocking their tailpipe to prevent the vehicle from stalling / ...
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2answers
577 views

Why Engine oil Leak at bottom of Hero Passion Plus Bike engine?

(Initially i didn't know about the oil limit in passion plus) I accidentally filled 2 Litre engine oil in my Hero Passion Plus Motorcycle, which is more than specified limit (1 Litre). With that ...
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0answers
31 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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44 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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0answers
32 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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2answers
2k views

Exhaust leak despite tightening the flange all the way

I replaced the catalytic converter on my 93 Miata with a test pipe. The issue is there is an exhaust leak that I can't seem to fix. I tightened the flange all the way around and it still leaks. It ...
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1answer
66 views

Will I burn my exhaust valves?

I have a 2015 Honda CBR500R I am thinking of taking my slip on exhaust off (just for sound,THE LOUDER YOU ARE THE SAFER) and putting on a K&N air filter. Will me doing that burn my exhaust valves?
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1answer
58 views

Why does my car sound like it has no catalytic converter when it hasn't been removed?

Well, my car suddenly started making a sound like if the catalytic converter was removed, which it has not. The noise started when my husband connected the a/c compressor directly to the battery ...
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2answers
66 views

Advantages of installing a bigger exhaust or two pipe exhaust when upgrading to a bigger engine

I recently installed a 328i engine on my BMW E36 320i. Now I know that E36 328i come with a bigger exhaust with two openings, not sure if they are dual pipes. But the 320i come equipped with a smaller ...
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3answers
170 views

How to slow down speed of sound of motorcycle exhaust [High to Low Frequency]?

[Will] I have an expensive motorcycle - assume:) with a sound of the exhaust of the high-speed engine. How to slow down wave sound speed of motorcycle exhaust [High to Low Frequency] that will sound ...
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0answers
197 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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1answer
38 views

Tailpipe tip color analysis [PHOTO] What is the good tailpipe tip color?

My Nissan Sylphy with a 2L Neo Direction Injection engine was running rich due to 2 faulty injectors (leaking) and I replaced all 4 injectors three months ago. I have put 2000Km during this three ...
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1answer
411 views

2004 Taurus - Help Identifying the leaking component

I was changing the oil on my 2004 Ford Taurus and I noticed this fairly aggressive leak. Can someone please help me identify this component and identify this leak? Any suggestions on correction?
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1answer
736 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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2answers
90 views

What is the most durable material for exhaust systems?

What is the most durable, long-life material for exhaust systems? I assume this is probably stainless steel, though even for that there are different grades of the metal. When looking for aftermarket ...
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1answer
393 views

Diagnosing Exhaust Leaks Upstream of 02 Sensor

I have a 96 Chevy G10 van with a 5.0. For a while I have suspected the vehicle may have had an exhaust leak. However, I also suspected the leak may have been around the manifold, and unfortunately, I ...
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2answers
56 views

2000 Honda CRV exhaust: keep old oxygen sensors?

I have an old 2000 Honda CRV, where the 18 year old exhaust is on its last legs and in need of a full replacement. The B-pipe bolt mount on the catalytic converter has rusted off, and the cat heat ...
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2answers
135 views

How to make an exhaust pipe thicker?

Long story short: my exhaust pipe snapped into 2 pieces right next to a flange connecting it to an upstream piece. Since it's too close to the flange, I cut the flange off and inserted a piece of pipe ...
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0answers
16 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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2answers
2k views

Muffler fell off and engine hesitates/stalls - Why and how?

I have a 2008 Ford Crown Victoria. Yesterday I went shopping and when I started my car to go home, the engine had a rough idling and eventually stalled when the transmission was in D. I didn't know ...
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1answer
43 views

Proper electrical cable disconnect procedure for purge valve?

Attempting to replace a canister purge valve (pictured) Some of the instructions I've read say to disconnect the battery terminals prior to remove the electrical cable and removing the valve. That ...
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2answers
68 views

Is it possible for me to see oxygen, caused by valve overlap, in the exhaust gases?

Recently I put my car on the 4 gas analyser, and it gave me these results at idle: CO2: 10.64 % CO: 4.98 % O2: 1.94 % HC: 148 ppm Lambda value: 0.93/13.7AFR I have to mention that it concerns ...
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0answers
71 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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0answers
35 views

Change exhaust on Ford Explorer

I have a 2003 Ford explorer V8 model & was looking at a set of Extractors & twin system for it. I was told it will give me a bit more grunt. But unfortunately they said it can't be done ...
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1answer
496 views

Fixing an exhaust leak at the O2 threads

I've been getting really horrible gas mileage on my 2003 Nissan Primera, and at inspection they said I seem to have an exhaust leak. So I took off the heat shield and sprayed some soapy water in ...
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2answers
2k views

What is this yellow powder on my exhaust manifold?

I took off the heat shield from the exhaust manifold on my 2003 Nissan Primera while looking for an exhaust leak, and I noticed this yellowish poweder / dust on it: Any ideas what it is? EDIT ...
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1answer
2k views

Weird “hair” comming out of my muffler [duplicate]

I recently noticed a burned smell when driving a little bit faster. Today, I found this stuff comming out of my muffler: I cannot imagine that this material should be in the muffler. However, before ...