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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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โˆ™ 2008-07-25 06:47:57
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Q: 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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Related questions

If sitting in idle vacuum can be at?

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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18 to 21 inches.

What is the correct vacuum pressure supposed to be on a Chevy 350?

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.

Where can you find definitive answers about vehichle intake manifold vacuum?

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.

How do you vacuum time a balance Chevy 350 engine with out a homonic balancer?

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.

What does OBDII code P0171 mean and what needs replacing?

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

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Can you help melocate vacuum pump on a 1987 E150 van?

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.

Why diesel engine not use vacuum as a system?

The engine does not produce enough vacuum to be usable

What is the vacuum on 96vortex 350?

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

What creates vacuum on a 350 Chevy engine?

The engine itself creates Vacuum once it is running.

How is vacuum pressure read?

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

What are inches of vacuum?

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

What is the conversion of vacuum in inches of water to vacuum in inches of mercury?

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30in is 762000 microns of vacuum

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

Where would the vacuum be located on a 1994 Chevy cavalier?

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

Where is the vacuum modulator valve in a 2001 impala?

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.

What is vacuum measured in?

vacuum is measured in pressure. To get a vacuum you need a negative pressure. that would be inches of mercury hg