BOOST????? Is this normal? Could this be my CEL problem?

[twadman]

Ok so I changed the brakes on my car and I have had the CEL on for a while, it a fuel trim malfunction, and when I took it out for a drive i noticed the boost was not sitting at 0 when i was not pressing on the gas or in neutral.

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This one is cruising in third at about 45 miles an hour. Just coasting.

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This one is coasting in neutral at about 45 miles an hour.



This is not normal is it? Does this mean boost leak?

 

[dSmgs-T]

ill take a wild guess and say that autometer gauge has taken a crap on you!
how does the car drive otherwise, feel normal?

 

[Boost92awd]

What is it at when the cars off? But looks like your gauge took a crap.

 

[twadman]

no not normal at all. and i have the autometer gauge. it drove alot better before i let it sit for a week because of this light coming on.

 

[Mr Peepers]

If the car is running, that's perfectly normal.

Since the boost gauge is tapped into manifold pressure it will see engine vacuum, which is around -20 inHg at idle(many factors will change this) and will constantly change at cruise depending on pedal position, rpm, and load.

It should sit at zero when the car is off.

 

[twadman]

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When off ^

Its idling kinda wildy to. And its my boost gauge on my cluster that is doing it to.

 

[Mr Peepers]

The boost gauge itself is off. If you subtract 2.5 psi(~5 inHg) from the other readings, you're pulling the correct amount of vacuum given the circumstances.

The only way to know for sure if you have a boost leak is by doing a boost leak test.

 

[twadman]

Ok thank you for your help. I just thought this meant a boost leak. Ill have to do a test then.