Questions tagged [exhaust-manifold]

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12
votes
2answers
3k 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 ...
7
votes
4answers
15k 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 ...
6
votes
1answer
5k 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. ...
6
votes
2answers
4k 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 ...
6
votes
3answers
331 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 ...
4
votes
3answers
4k 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 ...
4
votes
1answer
1k 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, ...
4
votes
1answer
318 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 ...
4
votes
1answer
83 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 ...
3
votes
1answer
292 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 ...
3
votes
1answer
2k 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
3
votes
0answers
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 ...
2
votes
1answer
1k 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 ...
2
votes
1answer
4k 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 ...
2
votes
1answer
333 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 ...
2
votes
2answers
2k 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 ...
1
vote
1answer
535 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 ...
1
vote
0answers
336 views

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 ...
1
vote
0answers
128 views

Black soot on exhaust manifold 2015 Ford KA 1.2

Is this normal or does it need replacing?
0
votes
1answer
46 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 ...
0
votes
2answers
53 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 ...
-1
votes
2answers
62 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 ...