Questions tagged [exhaust]

Questions about Exhaust systems, Catalytic Converters and Headers/Manifolds

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2 votes
0 answers
49 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) ...
1 vote
2 answers
75 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?
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 ...
1 vote
1 answer
57 views

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: ...
0 votes
1 answer
166 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 ...
1 vote
1 answer
75 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 ...
1 vote
1 answer
220 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
3 votes
1 answer
37 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 ...
0 votes
0 answers
37 views

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. ...
4 votes
4 answers
8k views

Is it possible for an oxygen sensor spacer to cause a car to stall?

VW CC 2010 2.0L CBFA I installed an O2 sensor spacer on my downstream O2 sensor and it seemed to be working for a day. One day later, after the car had cooled down it would rough idle and stall when i ...
1 vote
1 answer
75 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??
1 vote
1 answer
536 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 ...
0 votes
0 answers
22 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 ...
1 vote
1 answer
316 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 ...
0 votes
0 answers
53 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 ...
1 vote
1 answer
39 views

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 ...
0 votes
1 answer
97 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 ...
5 votes
1 answer
37k 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 ...
0 votes
0 answers
39 views

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 ...
0 votes
1 answer
49 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 ...
0 votes
0 answers
31 views

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 ...
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 ...
2 votes
1 answer
62 views

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 ...
0 votes
0 answers
32 views

Is it possible for a cambelt / plug change to affect the exhaust sound of the exhaust

A mechanic just completed a major service (cambelt tensioner, and plugs) on my 3.5L V6 Montero/Pajero engine. The vehicle now produces a very different exhaust sound. Before it produced an amazing ...
1 vote
1 answer
70 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 ...
1 vote
2 answers
117 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 ...
13 votes
4 answers
7k 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 ...
10 votes
5 answers
2k views

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
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 ...
0 votes
1 answer
59 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 ...
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 ...
6 votes
2 answers
9k 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 ...
10 votes
3 answers
9k 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 ...
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 ...
0 votes
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 ...
1 vote
1 answer
125 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 ...
2 votes
2 answers
3k 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
943 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 ...
2 votes
2 answers
139 views

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

A engine checklight 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 ...
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 ...
3 votes
3 answers
8k views

Can Exhaust leaks be repaired by welding?

I have some small leaks(few mm) in my manifold and down pipe. As mine is a rare US manufactured car(civic vti 99) and I'm in uk, mechanic said it will be quite difficult to find the part. I aksed ...
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 ...
38 votes
3 answers
375k views

What does a water-like drip 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 drops from its exhaust steadily in 4-5 second intervals. I tried to ask a couple of people at the ...
-1 votes
1 answer
152 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. ...
3 votes
2 answers
414 views

1999 Ford Ranger Exhaust Repair

I have a 1999 Ford Ranger with a 3L 6v flex fuel 2 door extended cab with a 6 ft bed. I need to replace the entire exhaust, however I cannot find a Y-pipe for the catalytic converter. All the parts ...
0 votes
1 answer
319 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, ...
6 votes
3 answers
22k views

Will Driving 100 Miles With a Misfire Damage My Car?

Background: I have a 2002 Dodge Dakota Quad Cab slt with 4.7L Magnum V8. My check engine light came on when I was at work. I then drove 20 miles home to my house, pulled out my scan tool and ...
2 votes
1 answer
2k views

Intermittent Metallic Rattle and Rotational Noise

Vehicle: 2009 Honda Civic LX I don't know much but what I'm hearing sounds like it might just be exhaust rattle. I haven't been able to find anything loose under the vehicle or in the engine ...
3 votes
3 answers
2k views

Why does the price of Catalytic Converters vary so much?

My check engine light came on and the diagnostic code says it is a problem with the catalytic converters so I'm getting ready to schedule an appointment with a mechanic to take care of that. The ...
0 votes
0 answers
153 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 ...

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