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Emissions and Exhaust Systems
Internal combustion engines have byproducts called emissions. These byproducts are either particulates or gaseous chemicals. Emissions travel from the engine via an exhaust system, which is a system of pipes that leads the emission away from the combustion source.
1,423 Questions
Do integral valve seats run hotter then inserts?
Integral valve seats typically run hotter than inserts because they are often made from the same material as the cylinder head, which can lead to higher thermal conductivity and heat retention. Inserts, on the other hand, are usually made from materials designed to dissipate heat more effectively, allowing for better temperature management. Additionally, the design of inserts often allows for better coolant flow and heat transfer, contributing to lower operating temperatures compared to integral seats.
Do you have to remove the engine to replace the exhaust manifold gasket?
In most cases, you do not have to remove the engine to replace the exhaust manifold gasket. However, depending on the vehicle's make and model, you may need to remove other components, such as the intake manifold or various accessories, to access the exhaust manifold. It's important to consult the specific service manual for your vehicle to determine the best approach. In some situations, working in tight spaces can make the process more challenging.
How do you check for bad valves?
By hooking up a vacuum gauge could help indentify bad valve. the needle of the gauge would bounce erractically during idle.
Your 92 Volvo 940 turbo smokes when idling it is blue thick smoke?
Could be valve guides and seals clean crankcase breather .poss. backpresure
Why is the check engine light coming on in a Toyota MR2 Spyder that only has 2000 miles on it?
Take it to Auto Zone and have the codes checked and cleared, for free.
How do you test the float inside fuel tank?
The float rises and falls with the gas amount so there is no real way to test in the tank. The float needs to be out so you can raise and lower it while checking the resistance with an ohm meter.
What part would make your car not pass smog regulations because of hydrocarbons?
Perhaps this may help you in your search for causes. A high hydrocarbon reading is usually unburnt fuel. If the CO reading and the NOx readings are below the limit then look towards an ignition problem as being the most likely culprit. As the prior answer suggested, start checking items and begin with the basics. Year, make model, engine size, options, symptoms etc will help you get a more accurate answer next time.
Check the plugs first, all of them! One bad plug will give you a miss and everytime the car misfires unburnt gas goes into the cylinder and out the exhaust which raises the HC. Same goes for the wires (check resistance with a multimeter) check the distributor cap & rotor (if applicable) for cracks, corrosion or burnt areas. Might want to do an injector service (if applicable), a sticky injector might put fuel in at times when its not supposed to and up goes the HC. If the check engine light is on 1st thing to do is pull some codes and this will give you some direction. Codes can be pulled manually by using the diagnostic connector or a scanner.
Answer
High hydrocarbon levels are also seen with a much too lean mixture. If you are looking at an older carburated car, check this first. A lean mixture will not burn completely, and unburned mix goed out the tailpipe. An overly rich mixture burns fine, but to carbon monoxide, not dioxide. So a rich mixture will fail on CO, not HC. This is the reason for the vacuum hose fix - it cuts down the amount of air entering the engine, while leaving the fuel the same ( or increasing it a little if the leaks are really bad ). This said, the ignition system is also suspect, as any misfire will increase HC. So, check your vacuum hoses (lightly spray connections w/ carb cleaner, an RPM increase means a leak), change your plugs and wires if they're more than a year old, and richen the mixture a hair if this adjustment is available.
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I had to replace a lot of vacume lines to get mine to pass. It also could be o2 sensor, bad spark plugs, rich idle(too much gas), bad spark plug wires, bad injectors(or carburetor), bad ignition coil/cap/rotor(weak spark), bad catalytic converter/clogged muffler, exhaust leak, etc.
Where is the exhaust manifold located on a 1999 Isuzu Trooper?
i have no idea what type of motor that the troope even has but your exhuast manifold is gonna be under the hood and the very starting point of your exhaust(the part that touches the motor and gets real hot real quick)
The spline that lifts and lowers the part to shut the valve be globe or gate valve
White smoke is a good indication you have a blown head gasket. And/or a cracked head. Did you noticed, when it happened that the engine started running rough? Best i can do with little info.
Check your oil,- is it foamy?
Examine your coolant. Does it smell like oil?
Is the smoke sweet smelling?
Knocking has nothing to do with a head gasket, sounds like you have multiple engine issues to me.
And finally...if changing a head gasket is simple, why does it cost so much? because if you don't work on cars all the time it is most definitely not simple and includes timing belt removal usually.
Overheating can cause knocking. then refer to the above....
Your best bet is to replace your motor because usually the knocking noise is caused by a spun bearing which would cost a lot to repair.
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The white smoke is from a blown headgasket, your coolant is leaking into one or more cylinders and that's actually steam that you see coming from your tailpipe.
When this happens, your coolant level drops (because it's pumping it out the tailpipe), your car overheats, and of course it will knock as it overheats. An overheated car is sluggish, as well.
Another bad thing that occurs by driving a car with this problem is that the coolant is washing the oil off your cylinder walls and your rings will tear up your cylinder walls as they self-destruct.
Head gasket replacement is not an easy fix nor is it cheap, and usually you'll need to get the head machined to make it perfectly straight again - heads warp from overheating. A good mechanic can do a head gasket replacement in a few hours.
- Dazani
This soudns like engine failure. Probably blew head gasket and ruined the engine due to it being run with bad head gasket too long.
You can find a god used engine with lower miles for around 800 at the most. usually more around 500 or 600 at most yards if you call around.
Labor to replace an engine we charge about 300 to 400 usually.
The car may not be worth doing this with however, some are not.
Most are though, if clean straight and drove fine.
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If your vehicle has a Diesel engine, then you may just be looking at 'fuel starvation'! All of the above are to a degree correct - but unlike Petrol engines, Diesel engines are also known to emit white smoke through the exhaust system when fuel delivery to the cylinders is restricted and give off the same appearance as a head-gasket problem.
This could also cause 'sluggishness' or lack of power, bad starting or non-starting and also a low type knocking noise.
Change the filter and check that the fuel lines are not clogged or restricted; you could even possibly run your own fuel supply line from a can to check this part out if it's easier for you!
Start the engine and rev it at about 3,000 rpm for a few minutes or take it for a short drive to see if it still loses power, if it still does then assuming all has been changed and cleaned, you might look to see if there is something in the fuel tank that could be blocking the supply pipe!
What would cause a car to go dead when gets wet?
Check the inside of the distributor cap. Moisture there will prevent an engine from running. Note that YOUR problem may be something else, but you can start by checking there.
Where can you get the dimensions of a car exhaust system?
Go to the dealers or manufactures website, they usually will have schematics
What do you torque an exhaust manifold to on a 2002 Ford Escort?
32 foot pounds. Check them after it has been run.
the po420 could also be a misfire or vacuum leak
What are signs of an exhaust leak?
Headache Nausea Sleepy Dizzy Death All from carbon monoxide poisoning
What does milky looking oil in engine with white steam from coming exhaust mean?
theres a very good chance that the engine has a blown head gasket.
what is happening is the water cooling the engine is escaping past the head gasket & into the engine, mixing with the oil making it milky coloured.
the water is also escaping into the cylinders, making the steam come from your exhaust, you may also have trouble when turning the engine over, with water building up in the cylinders when cooling down.
Does higher octane produce higher co?
Higher octane is helpful for high compression engines. High compression causes the combustion to take place faster and can cause pinging and a loss of power. By using high octane with high compression you get the advantage of the extra efficiency of the high compression engine and the delivery of the combustion across the power stroke of the piston, with out pinging.
Can you use a universal catalytic converter designed for a 6 cylinder in a 4 cylinder car?
Yes, if it will physically fit in the space provided. May have to adapt the in or out pipes. Reburn pipe also has to be conected. Might be tough.
Hey Lynn==It is probably just tired and in need of an overhaul. It will probably chug along for some time but an overhaul is in order. GoodluckJoe
sounds like you have leaky valve seals. They are letting oil into the cylinder when the car sits still. There are tools that allow you to replace the valve seals without taking off the heads. If you have or can afford the tools, this is the way to go.
bad valve stem seals or oil return holes in the heads are blocked with sludge.
