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What would cause the egr valve on your 96 buick roadmaster wagon LT1 engine to open to early the car runs rough at low rpm the egr is getting 15 inches of vacuum?

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2008-07-25 06:47:57
2008-07-25 06:47:57

Maybe it's not closing all the way? I have a 96 roadmaster wagon and have been getting check engine light lately - code error is EGR related P0400. Found out there is service bulletin for corrosion problems with the valve.

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Quality vacuum gage is required ;-) engine at running temperature around 18 to 20 inches Hg = vacuum

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That engine should have 18 to 21 inches of vacuum at an IDLE. You can find a vacuum source on the intake manifold.

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19 to 21 inches of vacuum at an idle, The higher the better. If the engine has a high performance cam then vacuum will be alot lower. When you rev the engine up vacuum should drop and then come right back up.

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Engine manifold vacuum should be between 15 and 21 inches of vacuum, the reading should be steady at idle, when the engine is revved and held the vacuum will drop then stabilize to 15-21 inches. The vacuum reading should be taken from a port after the intake butterfly. A Vacuum reading can be a helpful tool for diagnosis especially onvehicles prior to 1996 and OBD2, with OBD2 the computer does a lot of the diagnosis for you.

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All engines must have a harmonic balancer instaled on them. Balanced or not. Hook a vacuum gauge to direct vacuum port on intake. That is a place that will have vacuum on it when the engine is running at an idle. Then read gauge and move the distributor until you get the highest vacuum reading. It should be 18 to 21 inches of vacuum at an idle.

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"System lean, bank 1" First, I would suspect a vacuum leak. The engine is getting unmetered air. Check for disconnected vacuum lines, cracked rubber/plastic vacuum lines on the engine, on the firewall, in the engine compartment.

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The engine does not produce enough vacuum to be usable.

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vacuum routing diagram can be found under the hood. if that is not an option try a haynes or chiltons manual

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The engine is the vacuum pump. All the vacuum operated accessories are operated by the vacuum supplied from the engine.

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A gasoline engine makes it's own vacuum. The diesel engine has a vacuum pump next to the power steering pump.A gasoline engine makes it's own vacuum. The diesel engine has a vacuum pump next to the power steering pump.

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There is no vacuum pump on gasoline engines, only some diesel engines. Vacuum for vacuum controls is generated at the intake manifold. If the engine is getting old and weak, the vacuum starts to decrease and some of the vacuum controls will stop working.

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The engine does not produce enough vacuum to be usable

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18 to 21 inches of vacuum is a normal reading on a vacuum gauge.

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You need a vacuum gauge and it is reed in inches.

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The engine itself creates Vacuum once it is running.

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Pressure is often measured in inches of mercury when describing barometric pressure in weather reports. This term is also known as "inches of mercury vacuum".

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You must have a diesel. The vacuum pump is what gives you POWER BRAKES and on the newer engines it also makes the power steering work. Only a gas engine makes vacuum. A diesel engine does not make vacuum, so they install a vacuum pump.

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32 feet (384 Inches) of Water (H2O), and 29 Inches of Mercury (Hg) both equate to a perfect vacuum. From that, simple division yields 1" of water being equivalent to about 0.0739" of Mercury.

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30in is 762000 microns of vacuum

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Two possibilities: The engine is not running The port is plugged

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18 to 21 inches of vacuum is factory on all engines.

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The 1994 Cavalier creates a vacuum from the engine. There are vacuum hoses all through the engine bay, and under the dash.

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The 2001 Chevy Impala vacuum module can be found on the back of the engine. The vacuum module valve will be near the top of the engine.

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NO. When a engine is running it makes it's own vacuum. That's why there is no vacuum hose on that year regulator. It is inside of the engine.


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