Questions about Exhaust systems, Catalytic Converters and Headers/Manifolds

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9
votes
1answer
96 views

My feet turn black

I left the pedicure salon, started my car and drove less than 3 miles to pick up something from the store, when I stepped out of my car my feet were black... and I don't meant just from dirt, It ...
3
votes
0answers
32 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 ...
5
votes
0answers
25 views

2002 Mercedes E320 - Exhaust getting into the cabin of the vehicle and causing headaches

Experiencing exhaust fumes in the car. It's causing eyes burning and headaches after driving the car for 30 minutes. The Dealer checked and found nothing wrong but every time after driving the car ...
6
votes
1answer
47 views

08 Silverado 5.3 rough idle and dark cold start exhaust

I recently bought a 2008 Silverado 5.3 with 77k on it. After a couple weeks I noticed that at idle the engine would stumble and my rpms would drop slightly. It eventually set off the check engine ...
9
votes
5answers
551 views

Making a custom exhaust

I drive a 1990's Citroen BX TGE16 with no o2 sensors or anyhing fancy on the exhaust as far as I can tell. My exhaust is all rattly most surely from rust and age so I'm planning on changing soon. ...
9
votes
2answers
405 views

Motorcycle exhaust rattling / clunking / popping / burbling on deceleration

Lately I noticed a change in the sound my exhaust is making when decelerating from ~4000+ revs while in gear with the clutch not squeezed (that would be engine breaking probably). I'm unsure how to ...
16
votes
1answer
9k views

Is this what is making my car sound like a racecar?

Recently, my car (2000 Mercury Grand Marquis) started sounding like a racecar: the engine became very loud. There's clearly something going wrong with the exhaust system. I'm trying to understand ...
10
votes
1answer
90 views

What are the pro's and con's of compression braking vs. exhaust braking?

My truck supports 2 types of engine brakes: Compression release brake Exhaust brake Both can be selectively deactivated using switches. What are the pro's and con's of each type of engine braking ...
8
votes
1answer
116 views

My car's diesel exhaust smells really bad

First of all let me say I apparently have no exhaust leak. For a long time I've been asking myself how was it possible that the exhaust of my car smells so bad. It does it when in the morning, I ...
4
votes
1answer
83 views

what is the exhaust pressure of bajaj pulsar 220cc engine 2014 model?

What is the exhaust pressure of Bajaj Pulsar 220cc engine 2014 model? What is the normal idling rpm of Bajaj Pulsar 220cc? Can a turbocharger be installed on this bike?
9
votes
1answer
188 views

How does raw fuel damage the catalytic converter?

I was wondering, if fuel gets in the catalytic converter, how does it damage it?
18
votes
1answer
567 views

What does pie cut exhaust mean?

As the title says, when looking at building a custom exhaust system I've heard the reference called pie cut exhaust but I was unable to find any definition or terminology so I was curious to know what ...
11
votes
2answers
641 views

Do naturally aspirated engines need back pressure in the exhaust pipes?

I was thinking about removing the resonator from my exhaust but I watched a video saying that it will negatively impact the car as naturally aspirated cars need back pressure as it helps get rid of ...
10
votes
2answers
98 views

Do straight/short pipes burn out valves?

I have heard that straight/short/custom pipes can burn out valves on an engine. However, with a 4-cylinder Ford Model A engine, I have been told this is not the case because it has such low ...
3
votes
1answer
40 views

Motorcycle muffler is stuck

Trying to get my muffler off of my Yamaha L5T but am having no luck. Any tips or tricks to getting this off?
22
votes
2answers
2k views

Why do two-stroke engine exhaust pipes look so strange?

Two stroke gasoline engine exhaust pipes are shaped strange. They expand into a wide diameter and then shrink down to a very small diameter where the exhaust gasses emerge into the environment. Why ...
4
votes
4answers
1k views

What does it mean when soot is coming out of my exhaust?

I have a 2001 Jetta Wagon (Golf Variant is caller in my country). Petrol engine. Usually rides school and back (15 miles) with engine between 2000 and 3000 rpm. Just did a 300 mile trip at ...
7
votes
2answers
236 views

How to inexpensively replace missing baffles on a classic bike

Dilemma I have a 1980 Suzuki GS550L. Not only did one of the previous owners completely remove the baffles from the exhaust pipes, but they welded fender washers on the end of the pipes, so the OEM ...
3
votes
1answer
35 views

After perfoming tune up to my jetta 2.0

After performing tune up to the car due to misfiring replacing spark pugs new wires new gas filter When finished and started the car a lot of water came out of the exhaust like never saw it before. ...
3
votes
2answers
73 views

How do I check the exhaust system for damage after being rear ended at about 5mph?

After my last question, where I was rear-ended at about 5mph, I was told to check my exhaust system for damage. However I know nothing about to look out for. What should I look out for? What common ...
5
votes
1answer
39 views

How does clogging tailpipes result in carbon monoxide in the cabin?

Reports like this of people dying from CO poisoning in idling cars due to "clogged tailpipes" are disturbingly frequent. But how can this happen if the car is outdoors? First of all, how does a ...
24
votes
3answers
122k views

What does a water like drop coming out of the exhaust of the car signify?

Sometimes while driving in the traffic, I come across a car or two which would be dripping water-like drop from it's exhaust steadily in a break of 4-5 seconds. I tried to ask a couple of people at ...
10
votes
1answer
72 views

Porsche 918 - benefits of top mounted exhaust

Is the Porsche 918 the first production car with a top mount/exiting exhaust system? This article points out that by routing the exhaust up, Porsche was able to equip a completely flat underbelly and ...
8
votes
3answers
73k views

Why am I smelling exhaust inside the cabin of my car?

When I drive my car the first few miles, I smell exhaust inside the car with the windows rolled up. It happens when I have either the AC or the heat/air on... What's going on?
1
vote
3answers
3k views

Exhaust Flame Kit

I have been searching over the past week or so trying to educate myself as much as possible before going ahead and trying to build an exhaust flame kit from scratch (the ones on sale on the internet ...
10
votes
2answers
443 views

Ferrari 3.0L V8 - muffler positioning, and x-flow for specific sound

I am re-designing a Ferrari exhaust system with 2 objectives: 1: enhance the specific high pitch raspy sound that you expect from a small Ferrari V8. 2: achieve a good free-flow design. There is ...
18
votes
9answers
71k views

What is the best way to remove a stuck/rusted exhaust bolt?

I'm trying to disassemble the exhaust system on a 2000-2003 nissan maxima and I'm having trouble removing one last bolt.. its got a 14mm head and its just plain STUCK. I've tried soaking it overnight ...
5
votes
3answers
1k views

straight pipes and carb rejetting?

I have a 1984 Honda GL 1200 standard wing and I am going to put straight pipes on it, however some forums say I will need to upjet the carbs, and others say I will not. Has anyone on this site ever ...
8
votes
1answer
68 views

Is it possible to extend the length of the shaft on an existing turbocharger, further distancing the compressor from the turbine?

I'm toying with turbojet engine ideas, and over the course of my research it occurred to me that the combustion chamber could be more power-efficient and space-efficient if it was aligned in the ...
13
votes
2answers
2k views

Should motorcyle exhaust headers ever glow red hot

I've got a '99 Pegaso 650 which hasn't been running for about 7 years. It's was in a quite a deteriorated state when I got it, i.e. seized carbs, tank full of water, sump full of an ugly fuel/oil mix, ...
6
votes
1answer
121 views

Volvo S80 II 2.4 D5 DPF (Diesel Particulate Filter) regeneration conditions

What are the conditions required for the DPF (Diesel Particulate Filter) regeneration? Is it only exhaust temperature or speed and RPM also? I'm wondering if DPF can regenerate while car is at ...
3
votes
1answer
47 views

Is a chuffing sound from a 1999 Saab 9-3 sign of an exhaust leak?

I hear this sound when running alongside curbs or concrete walls with RPMs below 2000. I suspect it's a leaking exhaust manifold gasket, and intend to replace this in the near future. When I try to ...
5
votes
2answers
4k views

2001 Audi A4 just got really loud

Alright, So I'm driving to work. I'm stopped at the red light to go on the freeway. It turns green so I accelerate. I'm accelerating more than I would on a regular street but I didn't floor it. ...
5
votes
2answers
88 views

Exhaust Backpressure and Its Impact on LTFT Values

This is a follow-up from my initial question which can be found here : LTFT and STFT values are off and don't make sense. Car : BMW 2015 F10 M5 Modifications : Eisenmann Race Catback Exhaust, ...
7
votes
3answers
4k views

Effects of leaky exhaust valves

While rebuilding my valves, I noticed that 4 out of 6 exhaust valves on one side of the V6 engine were leaking after lapping and I had to relap them. I determined that by doing a water test. I am ...
4
votes
1answer
45 views

Does exhaust gas pressure impact the output of narrowband lambdas?

In the course of writing this answer I learnt that the current output of wideband lambda sensors is sensitive to exhaust gas pressure. This technical document for Bosch LSU 4.2 widebands explains how ...
10
votes
1answer
59 views

What Can I Learn From Exhaust Manifold Temps?

I was wondering what I can learn from the temperatures on the individual exhaust pipes coming out of each cylinder. The question is general, and my specific example is on my 98 Mazda 626 GF 2L. Last ...
6
votes
5answers
4k views

Remove rounded manifold bolt

I'm trying to take off the manifold bolts on an old Chevy 350 (the ones that connect the manifold to the header). I got 4 out of the 6 bolts out, but 2 are extremely struck and rounded due to all the ...
4
votes
2answers
153 views

Lost torque on my Yamaha XVS650

I have a Yamaha DragStar 650 1999. I have a Highway Hawk exhaust and I removed the baffles. Now the exhaust is completely open. When the engine is cold I can start it only if I pull the acceleration ...
7
votes
1answer
275 views

Why no exhaust gas turbine generator in hybrid vehicles?

I found something interesting on Wikipedia today: a hybrid turbocharger. This is a device that charges a battery with an exhaust gas turbine, and at the same time operates an air compressor using the ...
4
votes
2answers
724 views

How to install a California oxygen sensor into a federal catalytic converter assembly?

I have a 2000 Mitsubishi Galant ES 2.4L Engine with California emissions. Installed is a new federal catalytic converter assembly. The problem is that I do not know what kind of oxygen sensor to ...
6
votes
1answer
59 views

2009 Aprilia RSV1000 - Piggy Back ECU, Should I get one?

I have an Aprilia Tuono, 2009. It seems to run lean after putting an Akrapovic exhaust on it. It makes exhaust popping sounds on deceleration. My boyfriend said I need a power commander on it to ...
11
votes
4answers
393 views

How can I tell if I have bad cats?

No, not that cat! Catalytic converters - or "cats" - have a nasty habit of failing with age. What are the symptoms associated with a cat that's gone bad? Are there any tests that could ...
6
votes
1answer
514 views

Car leaks oil when driving, Oil from exhaust pipe

Car leaks oil when driving not while parked. The bottom of the vehicle is covered with oil and there's white smoke coming from tail pipe when driving. It sat and there no oil puddle in garage but ...
4
votes
2answers
732 views

What is the “dollar bill” test?

One of the questions recently made reference to an exhaust failing the "dollar bill" test. How does one perform it and what does it tell you?
5
votes
1answer
321 views

15 ppm of CO levels inside car

I constantly measure 15 ppm of CO inside my car after a long commute (~1 hour of continuous driving, but the overall trip can take from 1.5 to 2 hours depending on my destinations before heading ...
1
vote
3answers
115 views

2013 Subaru WRX - Stripped exhaust bolt

I got an exhaust and I was putting it on my car (2013 wrx) and had to disconnect the exhaust after the midpipe. The bolts were rusted so I PB blasted them, and then got one set of bolts off. When I ...
4
votes
1answer
3k views

How long will my motor last having clogged catalytic converters?

My catalytic converters have been clogged for awhile, and the o2 sensors need changed because of this. What is it doing to my engine? And gas mileage for that matter? If i take out my ...
3
votes
2answers
42 views

I just found out that my muffler wasn't even connected. I was driving it around lots is that bad?

I have an 1991 Ford Explorer. I just found out my muffler wasn't connected. I was wondering why it was so loud when I got it. I have been driving it for a month now and I'm hoping I didn't wreck ...
0
votes
2answers
104 views

2006 Scion Tc Base - lots of vibration and bad smell from exhaust

2006 Scion Tc base automatic transmission, has 149k miles on it.The car used to vibrate a little at idle. It suddenly started vibrating a lot. It is shaking as if there's an earthquake! Idle rpm at ...