Fuel and Engines
Saturn S-Series

Is it normal for a 1996 Saturn SL1 to only have 17 pounds of manifold vacuum?


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2015-07-16 18:04:59
2015-07-16 18:04:59

according to my service manual, the manifold vaccum should be like this:

Intake Manifold Vacuum (no load) --- 51 - 21hg at idle

Air Inlet restriction (no load) Between air filter and Throttle body 20hg at 4000rpm.

51 - 21hg roughly relates to 25 -10 psi

I also found this:

Crankcase Pressure/vacuum -- No load positive pressure

standard 4in H2O at 4000rpm

Service limit 10in H20 at 4000rpm

never knew you would need a water scale to diagnose a car :(

... its all the information i could find

Just to add an important note.....vacuum will only be measuring in inches of water column....you will NEVER see vacuum measured in pounds for a car. This may be helpful to you if you are looking for a vacuum gauge and none of them use a pound scale. (It will also help when explaining your problem to a mechanic)

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Related Questions

from the vacuum source in the intake manifold,to various vacuum operated components

If you mean specifically, what type of vacuum, the answer is manifold vacuum. Manifold vacuum is constant and doesn't, change with throttle valve opening, the way ported vacuum does.

In a normaly aspirated gasoline engine manifold vacuum will be 18-20"hg at sea level. you will drop approx. 1"hg manifold vacuum for every 1000' in elevation.

P2173 High AirFlow/ Vacuum Leak Detected (Slow Accumulation).You have a vacuum leak in the intake manifold.P2173 High AirFlow/ Vacuum Leak Detected (Slow Accumulation).You have a vacuum leak in the intake manifold.

Most likely a vacuum leak. Check vacuum lines, throttle body and EGR valve. Also the #1 reason is the intake manifold gasket leak. It needs to be replaced.

the vacuum comes from the intake manifold

There is no vacuum canister on this vehicle.

Your 1993 Ford Escort has many vacuum hoses. They all originate at the intake manifold. Trace all of them back to the intake manifold.

There are many. All hoses get their vacuum from the intake manifold. (plenum)

17 TO 19 INCHES AT A IDLE. 18 to 21 inches at idle, and the above answer is close enoungh too.

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

Take a vacuum hose off at the intake manifold and put a vacuum gauge on the port, then read the vacuum with the engine running.

bad vacuum hoses or leaking intake manifold gaskets.

The vacuum hose on the civic is going to be to the left of the intake manifold.

Directly behind the intake manifold: between manifold and firewall.

As with any internal combustion engine, the vacuum leak can be anywhere on the intake side, including intake manifold gasket, cracked intake manifold, EGR valve, throttle body gasket and even the vacuum operated devices can contribute to leaking, such as the vacuum assisted brakes or vacuum operated vent system. Starting fluid can often be helpful when searching for a vacuum leak; search the likely places, listening for the the typical hissing sound. Once you find a place that you suspect of the leak, spray a little of the starting fluid. When the starting fluid hits a vacuum leak the engine RPM's change slightly. Good luck.

Most all of the vacuum lines will start from the intake manifold in the rear..........

A MAP sensor is an anacronym for "Manifold Absolute Pressure" sensor. The sensor has a vacuum line going to it from an intake manifold vacuum port. It senses the amount of intake manifold vacuum or pressure depending on how far open the throttle (your foot) is when you drive. Wide open throttle-foot to the floor, dictates low vacuum in the intake manifold. This device is all part of your engine electronic control devices/sensors used to make your engine run at peak efficiency and perform its best.

Follow the main vacuum coming from the intake manifold and it will right next to the vacuum check valve......

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

"While Oreck was probably the first lightweight vacuum, there are now other vacuums that are eight pounds. Hoover, Electrolux, and Roomba have products that are also eight pounds."

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