Mercury Grand Marquis
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What is the purpose of the vacumn air pump on the right front side of the engine in a 1991 Mercury Grand Marquis?


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2006-12-27 15:44:01
2006-12-27 15:44:01

It is not a vacuum pump but it is an air pump. It makes the exhaust cleaner. This pump robs horsepower from the engine. More gasoline must be used to compensate for the loss of horsepower. More hydrocarbons are produced from more gasoline usage. The air pump blows oxygen rich air into the unburned hydrocarbon mixture so that we can make a measurement at the tail pipe to prove that we are not damaging the environment. It is against the law to tamper with this ingenious system. It is kind of like cutting down trees to make paper on which to write laws about cutting down trees to make paper... The catylitic converter(s) get much more efficient when clean air is pumped into the exhaust. Yes it does cause us to consume more fuel for the same unit of work. However, the overall (measured) emissions for the same unit of work is actually lower than the same system without the pump even though you have burned more fuel.


Related Questions

That engine does not have a vacuum advance.

When you accelerate it probably does not quit blowing but rather blows out the defroster vent. This would indicate a vacumn leak or possibly a bad vacumn check valve. The check valve is located in the vacumn line that goes through the firewall somewhere between the firewall and where it connects to the engine. Check the vacumn with a vacumn guage (pump) in line going into the dash for vacumn leak. Hope this helps. Keith

check vacumn tube lines for cracks or of vacumn lines are back of engine, right side, by computer modules.

Vacumn modulator could be at fault. In older cars both the transmission and the cruise control rely on engine vacumn to know what the engine is doing, if the vacumn strength is not properly relayed to these components then odd behiavior will result because the tranny and cruise control don't know what the engine is doing.

That means that the vacuum hose MUST be hooked up to the engine on a place that there is vacuum at all times when engine is idleing are speeded up.

A truck that can do housework

Most PVC valves go in the valve cover of the engine, either in left or right valve cover with vacumn line attached,just pulls out and pushes in for install,usually if pulled out and can shake and rattles its good, if carboned up and does not rattle its bad.

top of engine cover back side all the way to your left it screws in and hooks to a vacumn line

this one is easy your switch the controls the vents is not working there is a flap the closes the defrost vents so that it goes through the other vents or there is a vacumn line that is controlled by the switch, and its leaking. The vacumn line is usually on the engine side of the firewall. It is a very small plastic tube comming out of the middle of the firewall at the top and it connects to a junction with other vacumn lines. See if any of them are disconnected.

If the check engine light is blinking that indicates that the catalytic converter will possibly be damaged if you ignore the problem and continue driving the vehicle. i had a car in the shop here last week with that problem and it turned out to be a cracked vacumn hose. I lifted the hood and could hear the hissing sound from the vacumn leak . The crack was in the 90 degree bent hose connected to the PCV valve. This was a GM vehicle with the 3400 engine.

It is a container on a car used to store excess vacumn pressure that may be needed by the engine or ac systems to make starting easier

d16a1 from a 86,87 integra as long as it has vacumn advance = plug and play you will need axles and hubs from the integ that is the easiest or if you have alot of money anything will fit

on your car it is a defalt mode for air to blow out defrost when there is no vacumn from the engine so you should look for a broken vacum line or see if it has come unplugged on the engine.

Radiation can occur in a vacumn.

The path of least resistance is to pull the cross members under the car, pull the mounts disconnect : fuel lines, vacumn lines, linkage etc. and drop the engine and transmission out the bottom as a unit. Then split the engine and the tranny. GOOD LUCK

The most likely cause is a dilution of the fuel/ air mixture caused by a vacumn leak. check for a hissing sound near the top center of the engine.

an electronic spark module basically takes the place of set of advance weights and vacumn advance. it reads input from different sensors and engine conditions and either pull time or advances it for load, speed, throttle position etc... an electronic spark module basically takes the place of set of advance weights and vacumn advance. it reads input from different sensors and engine conditions and either pull time or advances it for load, speed, throttle position etc...

As far as I know, the oil pump and the brake system have nothing to do with each other. However, the brake system uses enging vacumn to assist braking. When you push down hard on the brake pedal, it causes the engine vacumn to diminish. This may result in the engine not getting enought fuel, because vacumn is involved in determining fuel mixture. If the oil light goes out within a second or two of releasing the brakes, I wouldn't worry about it. If it stays on for longer than that, it could mean that the engine needs to be serviced. If you have not had the spark plugs changed since the car was new, it is time to change them. Also, the air cleaner element probably needs to be changed.

He filled a vacumn created by the French Revolution.

a vacumn. Foam insulation is pretty good too.

This is a known as a bug bed bite unfortunately. Wash all your bedsheets and pillows you get these spots from vacumn cleaners so buy some vacumn bags. they r horrble had them before erghhh!!!

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