Questions tagged [exhaust-manifold]

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Audi A6 C6 3.0 TDI Revs Fluctuation and White Smoke

I have a really unusual problem. Once in a while (it doesn't do this always, it's really but really RANDOM), the car when warming up, it starts revs fluctuation and white smoke coming from exhausts. ...
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1 answer
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Exhaust manifold studs keep loosening?

Two main problems. Problem 1 is they keep loosening up. Not finger loose but definitely looser than the torque specs when I put them on there. I know you can't use loctite or a lock washer. I've heard ...
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1 answer
33 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 ...
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1 vote
3 answers
218 views

Best way to fix (or hack) a warped exhaust manifold?

The front exhaust manifold on my 2002 Ford Escape is warped. The problem is the catalytic converter is integrated into the exhaust manifold so a new one is like $800 and you can't get them at either ...
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0 answers
46 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 ...
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1 answer
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What are the differences between the 1993 and the 1994 Toyota 2.2L 5SFE?

I need to get a new exhaust manifold for my 1996 Camry and I am only able to find manifolds that are specified to fit the '92-'93 vehicles. Is there any difference between the exhaust manifolds? If ...
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3 votes
1 answer
56 views

Coolant flows straighr from rad to muffler?

Had my 2008 pathfinder towed last week it broke down and I thought it was a starting issue due to corroded post clamps, replaced those and it runs, but... now filling the rad the fluid runs straight ...
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2 answers
247 views

Best way to clean corrosion off exhaust manifold mating surface on engine side?

It’s an aluminum block and there are some high spots of white powdery corrosion. I was able to gently scrape most off using a (dull) metal paint scraper and a green scour pad, but there are some ...
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1 answer
2k views

How long can I drive with exhaust manifold leak? [closed]

I’m suspecting I may have a manifold leak because I’m getting burning smells from the manifold. I have just read that a leaking manifold can burn plastic wires etc. How long can I drive around before ...
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-1 votes
1 answer
36 views

what's the name of the sound cars and motorcycles makes during redlining?

when revving a car or a motocycle engine to a high rpm its starts to make a sound like (dun dun dun dun dun dunn) watch this video to understand what i mean( https://www.youtube.com/watch?v=...
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1 vote
1 answer
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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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332 views

How do I apply silicone to an exhaust manifold?

I’m going to be removing the exhaust manifold as I’m going to be removing the cylinder head. When putting the exhaust manifold back on how exactly do I put the silicone. Currently there is a metal ...
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1 answer
171 views

HHR - CEL giving codes P0171 and P0326

2010 HHR LT 2.2 has had funny idle with occasional stalling. Had oil changed last Sunday and noticed the air intake hose connecting fender to filter box was unraveling so my Daddy took it off and i ...
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1 vote
1 answer
147 views

Cleaning Exhaust Manifold

I would like to clean up my rusty cast iron exhaust manifolds. What is the best coating to use after they have been thoroughly cleaned, ceramic coating, powder coating, or heat resistant paint to ...
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2 votes
0 answers
164 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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2 votes
2 answers
182 views

How long does it take to trigger a CEL due to exhaust leaks?

tl;dr; If I have an exhaust leak that is sufficiently small such that upon the engine heating up the leak was reduced or removed to a satisfactory level to avoid seeing a Check Engine Light (CEL); how ...
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6 votes
1 answer
220 views

What socket fits the Catalytic-converter-to-Exhaust-manifold stud?

I'm trying to replace the exhaust manifold on my 2010 Chevrolet Equinox (2.4L 4-cylinder), and there are studs which connect the catalytic converter to the exhaust manifold. I cannot, for the life of ...
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-1 votes
2 answers
310 views

What is the best TurboCharger dump Pipe Length for a turbodiesel engine? [closed]

What is the best length for Turbocharger Dump Pipe. I have a Force Gurkha with a 2.6 litre diesel engine. I removed the second CAT Converter and Muffler from the exhaust. So now it has a CAT and then ...
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0 votes
1 answer
127 views

Is it ok to use a used manifold and downpipe?

car is civic vti 99. Need to change manifold and down pipe due to leaks. Aftermarket parts for this car are expensive so I was wondering if should get used parts from a breakers. When I suggested ...
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1 vote
0 answers
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Dodge Ram 1500, 2003 oil leaking from exhaust manifold

I recently had a mechanic replace the exhaust manifolds on my Dodge Ram 1500, 2003. Since I got it back I noticed oil leaking from bolt numbers 5 and 6 on the manifold diagram. I can see the oil ...
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1 vote
0 answers
181 views

Black soot on exhaust manifold 2015 Ford KA 1.2

Is this normal or does it need replacing?
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2 votes
1 answer
866 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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2 answers
82 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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4 votes
1 answer
3k views

Stripped header bolt hole. Can I repair w/o taking out the engine?

So I installed new headers onto my 95 mustang GT with a friend who "knew what he was doing" until he stripped one of my manifold bolt holes. I know I can either insert new threads or tap and dye it, ...
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6 votes
1 answer
9k views

How to retighten exhaust manifold nuts?

I changed my car cat converter as it was giving PO4020. After driving for 2 weeks I noticed soot mark as shown in the image above. There is no audible leak sound (tapping) at idle and when revving. ...
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2 votes
1 answer
2k 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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12 votes
3 answers
5k 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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2 votes
2 answers
5k views

Is oil on the manifold dangerous or will it just burn off?

I have a 1990 Econoline 250, it has a little leak in the valve cover gasket, it sits during the winter and the gasket contracts which makes it pretty bad the first time it starts up. After that not so ...
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2 votes
1 answer
8k views

How to clean exhaust manifold mating surface

I removed the exhaust manifold on my vehicle and now I am using a new gasket for the new headers. My question is how do I clean the block around the exhaust ports without damaging my engine? can I ...
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3 votes
1 answer
343 views

Could this be the source of an exhaust leak

I originnaly thought my exhaust leak in my 93' miata was from the exhaust manifold headers as there was some soot on the heat shield but after removing it and looking at the down pipe I see this piece ...
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3 votes
0 answers
34 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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1 vote
1 answer
908 views

What options do I have for installing an O2 sensor in a cast iron exhaust manifold?

I need to place an O2 sensor in my exhaust manifold. My exhaust manifold is cast iron and I cannot weld a bung on to it. I've also looked around and the shops around me aren't able to weld onto cast ...
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4 votes
1 answer
508 views

On a 2004 Mitsubishi Lancer, Can a separated catalytic converter be re-attached to the exhaust manifold?

My question title pretty much covers it. This is a 2004 Lancer. The family car, not the sport version. These pics might help: Can this be repaired without replacing the whole unit? (That's an ...
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6 votes
3 answers
573 views

Broken Exhaust Manifold Stud - Replacement part specs or part number

I was changing the Exhaust Manifold on an '09 Chevy Malibu. When tightening the bolt with the new one on, I twisted the whole bolt and stud off. So I have a couple issues. The broken stud is now left ...
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6 votes
2 answers
7k views

Broken Exhaust Manifold Stud - How to remove?

I was changing the Exhaust Manifold on an '09 Chevy Malibu. When tightening the bolt with the new one on, I twisted the whole bolt and stud off. So I have a couple issues. The broken stud is now left ...
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4 votes
3 answers
7k views

Can I cut these two bolts to remove the exhaust manifold on a 99 Ranger

I'm changing the head gasket on this truck. Here you can see the exhause manifold bolted onto the upper intake, which I am trying to remove. And here is the reason I would like to remove the exhaust ...
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7 votes
4 answers
18k views

How to test for a leak in the exhaust manifold gasket?

I suspect that my 1999 Volvo V40 T4 has a leaky exhaust manifold gasket. In winter there used to be some odd faint whistling while the engine was cold and now I'm trying to find the reason of a ...
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3 votes
1 answer
4k views

What sort of temperatures do exhaust manifolds on large engines reach after normal operation?

The main car that I was wondering for was a Nissan Altima 2.5l 4dr. 2007 with 138,000 Miles
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4 votes
2 answers
163 views

Trying to fasten a steel tube to an exhaust manifold

Does anyone have experience trying to fasten/connect a small diameter steel tube to a cast iron exhaust manifold? I'm working on a 1979 Ford F-100 with a 300 CID/4.9L inline 6 engine. Part of the ...
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