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What is the most common cause for exhaust manifold leak

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Loose studs or bolts, which also my warp the manifold aswell, dont discount

Posted on Oct 06, 2010

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Posted on Jan 02, 2017

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1 Answer

Exaust intake leaking


It's exhaust manifold. There are two manifolds, the intake manifold in the valley between the cylinder heads, and the exhaust manifolds, one on each side of a v figured engine.

And, yes, a leak in the exhaust or the intake will make it run lean. If the leak is close to the engine, it can do harm to the valves, too. There is a gasket between the exhaust manifold and the engine block. Likewise, there is an intake manifold gasket between the intake manifold and the block.

Apr 04, 2014 | 1998 Ford F150 Regular Cab

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P0171 AND P0174B WHAT DOES IT MEAN?


Trouble Code: P0171

Fuel Trim System Lean (Bank 1)

Possible Causes:


Air leaks in intake manifold, exhaust pipes or exhaust manifold.Fuel control sensor is out of calibration (ECT, IAT or MAF.)Low fuel pressure (fuel filter clogged, pressure regulator failure).One or more injectors restricted or pressure regulator has failed.HO2S element is contaminated, deteriorated or has failed.Vacuum hose is disconnected, broken, leaking or loose.Trouble Code: P0174

Fuel Trim System Lean (Bank 2)

Possible Causes:


Air leaks in intake manifold, exhaust pipes or exhaust manifold.Fuel control sensor is out of calibration (ECT, IAT or MAF).Low fuel pressure (fuel filter clogged, pressure regulator failure).One or more injectors restricted or pressure regulator has failed.HO2S element is contaminated, deteriorated or has failed.Vacuum hose is disconnected, broken, leaking or loose.

Oct 24, 2012 | 1999 Chevrolet Express

1 Answer

2007 Yukon xl denali burning oil


If you smell burning oil, you may have a leak in the engine compartment reaching the exhaust manifold and burning on contact. The most common cause for that is leaking valve cover gaskets. If you are losing oil with NO signs of external leaks, the engine may be burning it internally. Valve stem oil seals, worn piston rings, blown/leaking head gasket are a few causes of that.

Oct 07, 2012 | 2007 GMC Yukon XL Denali

1 Answer

What cause my 2000 lexus es 300 exhaust manifold to get hot


The exhaust manifold is going to get hot, this is where the engines exhaust flows through. these tempertures reach high temps,

If the manifold is glowing hot then theres a problem.

Sometimes people say the manifolds are getting to hot because they see them smoking. The reason on most of these cases is due to a leak, aleak from a bad gasket like a valve cover gasket. Engine oil leaks down on to the exhaust manifold causing smoke. make sure there are no leaks .


A few reasons that would cause exhaust manifold to heat up more than normal would be a engine thats running rich, this may be due to a leaking injector or a poor running engine. Another reason may be that you have a plugged cat. converter.

The Exhaust manifolds can reach about 600 degrees, the last thing is people hear the metal expand or contract and think there are getting to hot , this is normal.

Please let me know if there is something else i can help you with. thank you and have a good day.

Mar 18, 2012 | 1993 Lexus Ls 400

1 Answer

2001 jeep wrangler 4.0 new motor new intake new ecm and when you start it the motor instantly goes to 3000 + rpms. what will cause this???


There is a vacuum leak from installing the intake. Common problem. The exhaust and intake use a common gasket. When reinstalling the exhaust manifold, there are two guide pins, one front of the manifold and one in the rear. What usually happens is that the manifold sits ON these pins when installed and it creates a vacuum leak when the engine is started that instantly races the engine. The manifold has to be removed and when reinstalled, MAKE SURE the pins are IN the guideholes on the manifold.

Feb 18, 2011 | 1998 Jeep Wrangler

1 Answer

Replaced exhaust manifold on 99 jeep wrangler. turned ignition to start up and engine screams in full throttle, what could be the problem: vacuum, sensor???


The intake manifold is the common culprit for this. It may look like it is flush to the block, but it isnt and is causing a huge vaccum leak. There are two locating dowel pins that the manifold must be flush on before tightning the bolts. The usual problem is that the manifold is resting on top of these pins instead of flush, causing a gap. You have to unbolt the intake and exhaust manifolds, relocate the intake and replace the bolts.

Oct 19, 2010 | 1999 Jeep Wrangler

2 Answers

2002 trailblazer exhaust manifold why did bolts come loose.


I have a 2002 Trailblazer to and i have had that happen to me 2 times

Jul 14, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

WHERE TO LOOK FOR EXHAUST LEAK


There are several areas to check for possible exhaust leaks. i will list them below.

1. Exhaust manifold gaskets - This will be the most common area. There is a gasket that separates the block from the exhaust manifold. these gaskets can fail, thus, causing a exhaust leak at the manifold.

2. Lower manifold gasket(donut gasket) - This will be a possible leak spot as well. This small circular gasket is placed in between the upper exhaust pie and the lower side of the manifold. It basically separates the pipe from the exhaust manifold.

3. Exhaust pipe - The entire pipe can rust overtime, thus, creating small holes along the pipe structure. These holes will cause the exhaust to leak ,thus, filling the vehicle will moderate fumes and causing louder than normal engine sounds during revving.

4. Muffler - This component can also deteriorate to the point that it cannot filter out the noise. It will also cause leaks as well.

You will find the leak in one or all of the areas stated above in the list.

Jun 13, 2010 | 2006 Chevrolet HHR

1 Answer

Low pressure exhaust sensor faulty on passat 57


If you have low pressure in the exhaust manifold, then there would an exhuast leak somewhere from the exhaust manifold to the tail pipe. These leaks tend to get bigger over driving time. It may be the exhaust manifold gasket, or a crack in the manifold. Give a good listen for a sputtering sound. Part of the exhaust pipes have to be removed for access to the manifold. A good spray of PB breaker will help a lot with the bolts here.
Escaping gas is bad for the environment. This also causes gas to enter the manifold and make its way to the valves. The temperature of the incoming air is very cold compared to the combustion chamber and can cause damage the your valves by stressing them.
If you find no leak, then you may consider the sensor may be faulty or the leak is very small.
Good Luck.

Mar 03, 2010 | 2007 Volkswagen Passat Sedan

1 Answer

My car is smokeing under the hood what would be the problem


SMOKING UNDER HOOD CAN BE CAUSED BY MANY THINGS.BUSTED OR LEAKING RADIATOR HOSE.POWER STEERING HIGH PRESSURE HOSE RUPTURE GET FLUID ALL OVER HOT EXHAUST MANIFOLD CAUSING SMOKING.LEAKING VALVE COVER GASKETS ALLOW OIL TO LEAK DOWN SIDE HEAD TO HOT EXHAUST MANIFOLD CAUSING SMOKING.ELECTRICAL SHORT CAUSE SMOKE.

Oct 06, 2009 | 2000 Nissan Maxima

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